CN1863584A - Room ventilating method for e.g. school, involves fixing air jet on ceiling surface by coanda effect, sucking air by aspiration layer fixed to ground surface, and setting average blowing speed lower t - Google Patents

Abstract

The invention concerns a device (101) for airborne decontamination of a room (3) by mixing, an air delivery (19) and suction (21) flux bound by Coanda effect (C). A vertical piping (103) comprises a suction port lower end (104) and an air delivery upper end (105). An actuating means (106) circulates air (A) inside and outside. A suction nozzle (118) provides a vertical suction surface (Sa), for sucking air (A) along a suction duct (55) parallel and bonded to the floor (6) by Coanda effect (C). A blow nozzle (129) with ceiling surface effect (20) provides a front porous blowing surface (Ss). Said nozzle produces a primary air jet (19) bound to the ceiling (20) by Coanda effect (C). A decontaminating means (127) decontaminates the air (A). The active section (Sae) of the suction surface (Sa) is lower than the active surface (Sse) of the blowing surface (Ss). Thus the unwanted shunt air stream commonly associated with bound air flow ventilation systems is eliminated.

Description

Method and apparatus for decontamination by aeration and air flotation using mixed blowing and suction flow attached by means of Coanda effect

technical field

The present invention relates to a method and a device for ventilation and airborne decontamination, the purpose of which is to reduce the amount of contaminated particles suspended in the air in a room, the method of operation comprising:

by mixing;

Using two Coanda effects;

using a blown primary jet attached to the ceiling; and

Use a suction flow attached to the floor.

Background technique

Air conditioning methods have traditionally been technically classified according to the way air is distributed in the room being conditioned. In this way, the methods of air conditioning a room can be classified as follows:

Ventilation by moving air like a piston with unidirectional flow;

Ventilation by moving air through thermal stratification;

area ventilation;

ventilation by mixing; and

Ventilation is provided by local jets.

In ventilation terminology, "primary air jet" refers to a preconditioned (cooling, heating, decontamination, humidification, dehumidification ,…)air. The term "total air" refers to the mixture of primary air fed into the room and room air gradually entrained by and mixed with the primary air.

In the method of ventilating by piston-like movement of air (also known as unidirectional flow) or "laminar room", the air is moved by a unidirectional primary air jet occupying the entire cross-section of the room. A section of a wall of the room, usually the ceiling or sometimes one of the side walls, is used as the surface for blowing the primary air into the room. Air is blown into the room at a velocity sufficient to cause the air to pass through the room in parallel moving airflows to the opposite wall (typically the floor), which is porous and acts as a suction surface. It is also common practice to remove air by installing suction wall grilles close to the floor at the bottom of the wall. Laminar flow works on the principle of "piston movement". The primary air flow acts like a syringe to push back the contaminated air being drawn from the room. "Laminar flow" chambers can be used to achieve very low contaminant concentrations. Exhausted air is taken by an air handling unit associated with the building where it is filtered to remove contaminants and mixed with fresh air. This air is then blown back into the room through a distribution surface (typically the ceiling) fitted with a high-efficiency particulate air (HEPA) filter. Throughout the protected room, the flow velocity is approximately uniform across the entire section of the room, with a velocity of 0.3-0.5 m/sec. The blow surface and suction surface can be arranged as:

Two opposing walls (perforated ceiling and perforated floor);

Two mutually perpendicular walls (ceiling and suction grille at the bottom of the wall);

Never on the same wall.

The amount of air blown in laminar flow needs to be 10 to 100 times that of mixing ventilation with turbulence or devices that rely on thermal stratification to move air. In addition, the entire ceiling needs to be fitted with HEPA filter walls. In contrast to mixing ventilation devices (turbulent rooms) or ventilation devices that rely on thermal stratification to move air, devices that move air like a piston (laminar flow) ventilate as follows:

Higher investment costs, an order of magnitude higher; and

Energy costs are about 10 times higher.

Furthermore, the structure of laminar ventilation, including the entire blowing wall (ceiling or wall), makes it impossible to make it a mobile system. A ventilator that moves air like a piston can only be used to remove contaminants from the air and require ultra-cleaning, not at all for air conditioning purposes because it is too expensive.

In ventilation methods that rely on the phenomenon of thermal stratification to move air, one or more low temperature air (cold air) diffusers are placed on or near the floor. This method relies on the difference in air density in the room to work. The layer of "fresh" primary air that is cooler and heavier than the room air, being fed into the room through the bottom, gradually pushes the room air upwards (because the room air is warmer and floats on top of the cooler air). Ventilation methods utilizing thermal stratification are less expensive than ventilation methods in which air moves like a piston. Its purpose is mainly to ensure that the people in the room are at a comfortable temperature. Unfortunately, it is very sensitive to temperature distribution and not very effective in air flotation to remove contamination, especially bacteria and mold. In addition, the air distributors it uses are heavy and require strong structural supports on the floor. They also cannot be manufactured in the form of mobile systems. Ventilators that rely on thermal stratification to move air are used primarily in air conditioning applications.

In zone ventilation methods, the principle is to treat certain zones or volumes in a room while leaving the rest of the room alone. It is generally accepted that zone ventilation is more effective than ventilation by mixing in each zone being ventilated. However, it is less effective at overall dilution of contaminants, which often results in less effective overall removal of contaminants from a room.

In mixed ventilation methods, air movement is primarily accomplished by the energy of one or more primary air jets injected into the room. The theoretical goal of using the mixing method is to establish a homogeneous state for the air in the room. To this end, one or more primary air jets injected into the room are mixed with the volume of air in the room. This phenomenon is called "induction". Ventilation by mixing is generally preferred for establishing better thermal comfort for the occupants of the room. The term "occupied" area refers to that part of the room where people are always present. It is usually defined as the space that extends 50 cm into the room from one surface of the wall with the window, 20 cm into the room from the other walls, and extends to 180 cm above the floor. Ventilation by mixing attempts to mix (as completely as possible) the primary air with the air already in the room, so that the various impurities and contaminants in the air in the room are not only diluted and less toxic, but are often eliminated. more evenly distributed. Also, it is desirable to keep the temperature in the room as uniform as possible so that people don't feel uncomfortable. Unfortunately, the dimensions of a moderately sized room and the number of air distributors generally require that the jet of primary air (cold air) be injected at such a velocity that, if people are facing the jet of primary air, this velocity may exceed that required for comfort. acceptable to the people. The method of ventilation by mixing can be technically subdivided into two types:

mixed ventilation with free primary air jets; and

Mixed ventilation with primary air jets attached by means of the Coanda effect.

In mixed ventilation with free primary air jets, primary air jets are injected into the room (usually from top to bottom) blow). The primary air jet passes substantially perpendicularly through the envelope of the occupied area. The movement of the air in the room is almost chaotic. The primary air jet reaches the occupants of the room almost before any appreciable mixing with the room air. This tends to make people feel uncomfortable in temperature.

In the ventilation method of mixing with primary air jets attached by virtue of the Coanda effect, the primary air jets are injected into the room through an air distributor installed in an area on the side wall of the room (usually close to the ceiling), and The direction of the jet is approximately parallel and tangent to the walls (usually the ceiling) of the room. That is to say, outside the occupied area, the primary air jet is sprayed into the room between the envelope surface of the occupied area and the wall to which the primary air jet is attached. In this way, the primary air jet follows a long path and gradually mixes with the bulk air in the room before reaching the occupied area. Such an arrangement is popular for allowing people to experience a more comfortable temperature.

From the many experiments carried out by the Romanian engineer Coanda in 1910 for aviation purposes it is already known that when an air jet is placed close enough to a surface such as a ceiling, the air jet becomes attached to the surface and remains in contact with it continue to move forward. This phenomenon is known as the Coanda effect or surface effect. This is due to the tendency of the air jet to suck in and mix with (diffuse) the surrounding air it comes into contact with. However, no air may be drawn in near the surface. This will cause a pressure drop between the air jet and that surface, causing the air jet to become attached to that surface.

The invention relates to a method of ventilation of the type that uses mixing of primary air jets attached to the ceiling by means of the Coanda effect, while the air is drawn through a suction opening in the form of a suction flow also attached to the floor by means of the Coanda effect . In this type of ventilation, where the size of the room is such that it can be used, the jet of primary air can do its job and reach the opposite wall from which it is ejected, before it is gradually "diluted". The entire air flow then continues forward along this opposite wall and then flows back to the suction opening close to the floor. This creates a kind of "surrounding" of the occupied area by passing the air from the ejection surface to the suction surface.

Initial experimental data on the method of ventilation by mixing with primary air jets attached by virtue of the Coanda effect date back to 1939, when Baturin and Hanzhonkov demonstrated the "back flow" deflected by the ceiling and the opposing wall facing the occupied area Phenomenon. In Baturin and Hanzhonkov's analysis of the structure and shape of the formed air flow, they concluded that the shape of the air movement depends on the installation position of the blowing grill (surface), and is affected by the structure and suction of the suction grill (surface). Atmospheric conditions have little effect. Later theoretical works by Nelson, Steward, Bromleys, and Gunes gave distributions of temperature and velocity in the ventilation method by mixing with wall-attached primary air jets. Another theoretical work published by Linke states that there exists a maximum length of room that can be ventilated properly using this principle. In particular, he demonstrated that for a straight primary air jet attached to the ceiling, with a Reynolds number in the range of 1,825 to 12,000, the length of the room cannot exceed 3 times its width in order to establish an "envelope" flow.

When the length of the room is less than this limit (<approximately 3 times its width), an air flow enveloping a single area is obtained. An explanation of this phenomenon will be given below with reference to FIG. 2 . Such rooms are called "short rooms".

Rooms that exceed this limit are called "long rooms". Such rooms are "divided" by air flow. The first circular movement of the air, similar to that available in the "short room", consists of a total jet of air which follows the ceiling and then flows vertically down through the center of the occupied area and back. to the suction surface lying horizontally near the floor. Another vortex or "enclosed" air circulation occurs between the first circulation and the other end of the room. A description will be given below of this phenomenon with reference to FIG. 3 .

Those published theoretical and scientific experimental studies show that:

When not imposing any specific condition (the present invention recommends about the condition of average blowing velocity and average suction velocity will be given below);

An "oblique interfering shunt airflow" then appears at a horizontal distance from the active side wall (the one with the blowing surface and the suction surface) of about one level of the room.

This "slanted disruptive diverter air flow" may rise from the floor and flow obliquely through occupied areas up towards the blower openings. An explanation of this phenomenon will be given below with reference to FIGS. 2 and 3 .

In implementing methods of room ventilation by mixing with attached primary air jets, published works on air flow paths and air velocities only deal with thermal ventilation applications. They try to ensure that the air velocity and temperature in occupied areas are as pleasant as possible. In the prior art, the general effect sought when performing ventilation methods by mixing with attached primary air jets is to prolong the distance that the primary air jets travel in the room before entering the occupied area. Those skilled in the art [represented by the group of scientists who published the above-cited scientific work] have hitherto studied the use of attached primary air jets for the removal of airborne contaminants, i.e. in the form of Ventilation methods which reduce the amount of suspended contaminating particles in the rooms to be ventilated and the installations for implementing such methods are not of interest. As mentioned above, those familiar with the technical field have basically been working on the thermal effect of ventilation and the thermal comfort of people in the room, even in their writings: it may be possible to start from the primary The "inclined disruptive diversion air flow" rising from the floor of the room being ventilated by the air jet can lead to what they consider to be a "beneficial" effect. Those skilled in the art believe that this "slanted disruptive split air flow" enhances mixing and thus the effectiveness of thermal ventilation. Thus, it is natural to understand why those skilled in the art would not want to reduce or eliminate "slanted disturbing diverter air flow", although it is fundamentally detrimental in terms of air flotation decontamination. In the usual frame of thought of those familiar with the art, the problem of air flotation decontamination is considered to be:

Or the problem is serious and can be solved by ventilating the air as a piston with a unidirectional flow, although the main disadvantage of this method is the high cost;

Either the problem is less important and can be solved by ventilation with mixing with free primary air jets, or with ventilation with mixing with attached primary air jets, regardless of the " oblique interference split air flow" (that is, ignore its adverse consequences);

Or the problem is very minor, in which case a recirculation of the air would suffice, resulting in not very effective removal of contaminants, rising from the floor with contaminated particles and diverting air that can be disturbed by "tilts" The interfering air flow enhanced by "flow" can be ignored.

The main purpose of the present invention is to reach:

To benefit from the recognized inherent advantages of ventilation with attached primary air jets, in particular to ensure the comfort of the occupants of the room, and to make equipment and operating The low cost of a ventilating method that moves like a piston; and

Also suitable for use in applications requiring high levels of contaminant removal and "ultra clean".

To this end, the present invention seeks to reduce or eliminate the phenomenon of contaminated particles that have settled on the floor moving upwards and returning to a floating state, which often occurs in rooms ventilated by means of attached air jets. Thus, the main object of the present invention is to provide means for improving the method of ventilation with primary air jets attached to the ceiling by means of the Coanda effect in an attempt to reduce or eliminate the possibility of "sloping disturbing diverted air" rising from the floor. flow" exists. A secondary object of the present invention is to provide a design for a mobile device for removing airborne contaminants independent of the structure of the building, which implements a method of ventilation with attached primary air jets, but There will be no "slanted disruptive diverter air flow".

The mobile device for removing airborne contaminants that is independent of the structure of the building is:

Works on the principle of diluting the air, which is similar to the principle of a room with turbulence in it;

Also works like a purifier, with ventilation in the form of local jets.

The indirect technical background of the present invention consists of a mobile device for removing contaminants from the air that sucks in and blows out air substantially horizontally at approximately the same height. Among devices of this type, mention may be made of the device disclosed in US Patent 6,425,932 by Huehn, Deros and Bourque. It can be clearly seen that that device cannot blow out a primary air jet attached to the ceiling, nor can it utilize a sucked air flow attached to the floor.

In the indirect technical background, there is also a mobile device for removing pollutants in the air that sucks in air at a high place and blows it out at a low place.

US Patent 5,240,478 to Messina describes a HEPA filter cleaner that draws in air at a high level and blows it out at a low level.

US Patent 5,612,001 to Matschke describes an ultraviolet (UV) lamp purifier that draws in air at a high level and blows it out at a low level.

US Patent 5,656,242 to Morrow and McLean describes a UV lamp purifier with an electrostatic filter that draws air in at a high level and blows it out at a low level.

It should be easy to understand that these purifiers that suck in air high and blow air low cannot create a primary air jet that attaches to the ceiling because their low air flow would cause it to rise from the floor Formation of disturbed air flow containing contaminants.

In the indirect existing technology, there is also a mobile device for removing pollutants in the air that sucks in air at a low place and blows out air at a high place, but the height of the blown air is too far from the ceiling, so that the blown air The primary air jet cannot rely on the Coanda effect to attach to the ceiling.

US Patent 4,900,344 to Lansing discloses a filter purifier with a bottom suction nozzle at floor level and an upper nozzle at a low height not close to the ceiling.

US Patent 5,997,619 to Knuth and Carey discloses an ultraviolet lamp and filter purifier that draws in air from the low sides and blows it out at a low height not close to the ceiling.

U.S. Patent 6,001,145 to Hammes discloses a filter purifier with a bottom suction type air inlet at floor level and an upper blower arrangement at a low height that does not allow the primary air jet to attach to the ceiling .

U.S. Patent 5,453,049 to Tillman and Smith discloses a purifier of rectangular cross-section with a wide bottom suction port through a HEPA filter and a vertically directed top blow port at a low height through a small opening , this height does not allow the primary air jet to attach to the ceiling.

U.S. Patent 4,210,429 to Golstein discloses a UV lamp and filter purifier having bottom side suction ports and upper side blow ports at a low height that does not allow the primary air jet to attach to the ceiling.

These purifiers are all of the partial jet flow type. None of these documents deal with devices utilizing primary air jets attached to the ceiling by means of the Coanda effect. Nor is there any document describing measures for reducing or eliminating the "slanted disruptive diverter air flow" between the floor and ceiling.

Finally, there are mobile devices for decontaminating the air that suck air in from a low level and blow it out near ceiling height, which theoretically allow the primary air jet to be strained by the Coanda effect. into the ceiling.

US Patent No. 5,290,330 to Tepper, Suchomski and Mex discloses an independent device for removing pollutants in the air, which is in the shape of a vertical cuboid with both horizontal bottom air inlets and top air outlets. Airborne contaminants are removed with a cylindrical filter element positioned vertically inside the unit. The patent states that the suction port and the blowing port are vertically spaced to ensure air movement from the ceiling to the floor. That document does not teach the attachment of the air jet to the ceiling by means of the Coanda effect, nor the attachment of the suction air flow to the floor by means of the Coanda effect. That document also does not describe the existence of "slanted disruptive diverter airflows" that may rise obliquely from the floor to the ceiling. This patent does not describe any measures for avoiding this phenomenon. Finally, as can be seen from its attached picture, the size of its suction grille and blowing grille are similar. As a result, the blowing speed and the suction speed are approximately equal.

U.S. Patent No. 5,225,167 to Wetzel discloses a self-contained device for removing pollutants from the air. The device is roughly cuboid in shape, mounted on the wall of a room, and uses an ultraviolet lamp and a HEPA filter to remove pollutants in the air. It draws in air through the grill from a position close to the floor but at a certain distance from the floor. Air is blown through a quarter cylinder shaped HEPA filter near the ceiling. The patent does not describe in any way relying on the Coanda effect to attach the air jet to the ceiling, nor does it describe relying on the Coanda effect to attach the intake air stream to the floor. The air outlet of the quarter-cylindrical HEPA filter may make the blown primary air jet obliquely blow to the floor, and it is not conducive to the primary air jet becoming attached to the ceiling by the Coanda effect. Suction ports deliberately placed at a distance from the floor are also detrimental to establishing a suction flow that relies on the Coanda effect to adhere to the floor. The patent does not describe in any way the existence of a "slanted disruptive diverter air flow" that could rise from the floor to the ceiling. This patent does not describe any measures for avoiding this phenomenon. Finally, as can be seen from its attached picture, the size of its suction grille and blowing grille are similar. As a result, the blowing speed and the suction speed are approximately equal.

US Patent 5,616,172 to Tuckerman, Russel, Knuth and Carey is the closest prior art to the present invention. It discloses a self-contained mobile device for removing airborne contaminants which is generally cuboid in shape and which can be placed vertically along the walls of the room to be treated. Remove airborne contaminants with UV lights and HEPA filters. Air is sucked in from the floor through air intake nozzles in the form of suction on the floor level formed between the bottom of the device and the floor. The air outlet is arranged on the top of the device, and blows air vertically to the ceiling. The shape of the device is deliberately made thin and tall to increase the distance between the air intake grille and the blowing grille, thereby avoiding a "short circuit" between them. Also described are wind deflector vanes mounted on the blowing grille to incline the primary air jet blown from the top of the device towards the ceiling so that the primary air jet flows along the ceiling. Although the patent is silent, it is conceivable that the primary air jet is attached to the ceiling by means of the Coanda effect. However, this patent thinks that the measures for avoiding the "splitting phenomenon" between the suction grill and the blow grill are only to widen the distance between the two as much as possible. That arrangement is indeed necessary. However, that is not sufficient, as described in the aforementioned patent document and as shown in the explanations that will be given below. First, the patent does not take into account the existence of a "slanted disruptive diverter air flow" that may rise from the floor (in the middle of the room) and flow along a slanted path through the occupied area upwards towards the tuyere. The patent only focuses on the direct "split" between suction and blowing, which is another issue.

Therefore, it can be considered that this patent does not recommend any measures for the following aspects:

The ratio between the suction speed and the blowing speed;

Or the ratio between the effective suction area and the effective blowing area; although the distance between the air intake grille and the blowing grille is enlarged, it is not to reduce or eliminate the flow that may rise from the middle of the floor to the ceiling "Sloped disruptive diverter airflow" for the purpose.

The relative dimensions of the effective suction surface and the effective blowing surface are not specified. Unfortunately, however, if these specific precautions regarding shape and flow velocity are not taken, the aforementioned scientific works and the explanations given below prove that the spacing between the blowing grill and the suction grill is essential for eliminating The phenomenon of "sloping disturbed split air flow" is not sufficient.

As mentioned above, those skilled in the art believe that the suction ports are of minor importance in the movement of the air, and that the suction ports only have an effect on their proximity. As will be shown below, those skilled in the art are mistaken on this point. It can be said that the prior art has not paid enough attention to the influence of the shape and position of the suction port. It is clear that no scientific research has been carried out on this subject to date.

Therefore, it is obvious that although the method of ventilation by mixing primary air jets attached to the ceiling by means of the Coanda effect and suction flow attached to the floor is known and widely used in thermal control in the field of air conditioning, , so far it has not actually been used in the field of removing contaminants floating in the air due to the phenomenon of "oblique interfering shunt air flow", and this problem of degrading the performance of removing contaminants has not been solved in the prior art. Phenomenon.

Contents of the invention

The invention firstly relates to a method of ventilating a room by mixing a primary air jet attached to the ceiling by means of the Coanda effect and a suction flow attached to the floor. More specifically, the present invention relates to ventilation methods of the type in which a jet of primary air that has been preconditioned (heated, cooled, decontaminated, humidified, dehumidified, ...) is passed through a "treated" side wall ( "treatment" side wall) aligned blowing surface close to the ceiling, and the blowing direction angle [average of the mean direction (mean direction) of the various parts of the primary air jet on the blowing surface] is directed toward the ceiling ( Or parallel to the ceiling), so that the primary air jet blown out is attached to the surface of the ceiling by the Coanda effect. Simultaneously, at a flow rate equal to the flow rate of the primary air jet, a stream of contaminated air is sucked in through a suction surface which is approximately vertical and placed in alignment with the same process side wall and Near the floor of the room. In this way, it is ensured that the air is sucked in close to the floor, that the suction flow is approximately horizontal, parallel and attached to the floor by means of the Coanda effect.

The inventors of the present invention have carried out empirical experiments and computer simulations for a ventilation system that utilizes a primary blowing air jet attached to the ceiling and a suction flow attached to the floor to mix, and the results show that: in a closed room, this This form of ventilation can result in a "slanted disruptive diverter air flow" that may rise from the floor and follow an upwardly sloping path through occupied areas to the tuyere. This phenomenon is well described in the prior art and in the aforementioned literature, but no measures aimed at eliminating it have been found so far.

In the simplest form, the ventilation method of the present invention consists, among other things, in that the average blowing velocity Vs (average of the speeds of the individual parts of the primary air jet flowing through the blowing surface) is lower than the average suction velocity Vs. Air velocity Va (the average value of the velocities of the various parts of the inhaled air flow passing through the inhalation surface) (Vs<Va). The inventors of the present invention have found by using computer models and air flow measurements of an independent device for removing pollutants in the air in a room that implements this method: when implementing the measures of the present invention, the The above-mentioned phenomenon of "oblique interfering split air flow" can be greatly reduced or even eliminated.

Description of drawings

Fig. 1 is a schematic side view showing the phenomenon of sinking of suspended particulate matter and returning to floating in a non-ventilated room.

Figure 2 is a schematic side view showing the airflow distribution in a "short room" which is ventilated (without special precautions) by means of blown-out primary air jets attached to the ceiling and attached Mixing with the inspiratory flow at the floor (copied in Muller's patent).

Figure 3 is a schematic side view showing the distribution of airflow in a "long room" which is ventilated (without special precautions) by means of primary blowing air jets attached to the ceiling and attached to the The inspiratory flow of the floor is mixed (copied in Muller's patent).

Figure 4a is a schematic side view showing the airflow distribution obtained from a computer simulation of a ventilator (of the type shown in Figure 2) operating in a ventilated room taught in accordance with the present invention , mixing with the primary blowing air jet attached to the ceiling and the suction air attached to the floor.

Figure 4b is a schematic perspective view showing the air flow distribution obtained from a computer simulation of a ventilator (of the type shown in Figure 4a) operating in a ventilated room taught according to the present invention, and The effective suction and blowing surfaces used on the side walls of the ventilation device of Fig. 4a are shown in an enlarged view to facilitate comparison of their relative relationship and average suction and blowing velocities.

Fig. 5a is a schematic diagram of a portion of a moving air flow, which facilitates analytically explaining the advantages achievable with the present invention and enabling "oblique interfering split air flow" to be eliminated.

Figure 5b is a schematic diagram showing the numerical simulation conditions of the air flow profiles obtained for a prototype of the stand-alone apparatus for removing airborne flotsam of the present invention.

Fig. 5c is a table of values showing the results calculated with the numerical simulation shown in Fig. 5b.

Figure 5d is a graph showing the results in Figure 5c.

Figure 6 is a schematic side view of the air flow obtained from a computer simulation of a self-contained decontamination device operating in a room in accordance with the teachings of the present invention.

Figures 6a and 6b are cross-sectional and perspective views on a larger scale of a self-contained contaminant removal device of the present invention.

Figure 6c is a top view showing the operation of the device of Figure 6d, showing the horizontally generated airflow streamlines.

Figure 6d is a schematic side view on a larger scale of the intake nozzle of the stand-alone contaminant removal device of Figure 6, showing its effect on floating contaminated particles and particles on the floor level.

Figure 6e is a schematic perspective view showing the device of the present invention together with its inspiratory flow.

Fig. 7 is a schematic side view showing the working principle and action on floating matter of a contaminant removal device operating in a room according to the teaching of the present invention.

Figures 8a and 8b are cross-sectional and perspective views of the blowing nozzle of the stand-alone contamination removal device of Figure 6, showing its position relative to the ceiling.

Figures 8c to 8h are side views showing the effect of adjusting the blowing direction angle on blowing with the device of the invention.

Figures 9a and 9b are several side views showing the importance of the solution proposed by the present invention for adjusting the suction speed and blowing speed.

Fig. 10a is a perspective view showing a detailed structure of a second embodiment of the nozzle of the present invention.

Fig. 11 is a perspective view showing a detailed structure of a preferred embodiment of the air inlet nozzle of the present invention.

Fig. 12 is a perspective view showing an embodiment of vertical trunk means of reduced thickness which is preferred in the present invention.

Figures 13a and 13b are perspective views showing one embodiment of a height-adjustable vertical chimney arrangement preferred in the present invention.

Figures 14a and 14b are perspective views showing an embodiment of the device of Figure 6 having an auxiliary inlet nozzle which is preferred in the present invention.

Figures 15a and 15b are perspective views showing an embodiment of the device of Figure 6 having an extendable blow nozzle which is preferred in the present invention.

Detailed ways

Figure 1 shows an ordinary non-ventilated room 3. The room air A in the room 3 is filled with a large number of contaminating particles 4 which are considered to be floating matter, which are attracted to the level of the floor 6 by sedimentation 5 under their own weight and gravity. As a result, the contaminated particles 4 moving with a very low vertical settling velocity 5 will gradually accumulate in the thin air layer Cc which is highly contaminated and in contact with the floor 6 . If the contaminated particles 4 in the room 3 are examined, among the suspended solids in the main volume of the room 3, a part of the contaminated particles 4 existing in the suspended state 4a in the form of contaminated floating matter is very small, although it has a significant impact on the room. 1 people in extreme danger. Under the action of gravity, due to the thermal convective motion and Brownian motion from the floor 6, another part of the polluted particles 4 accumulates in the very thin, highly polluted air bottom layer Cc in the form of a very dense cloud of contaminated floating matter 4b inside. The concentration of the accumulated contaminated floating matter 4b increases closer to the floor 6 . However, most of the contaminated particles 4 present in the room 3 are cohesive particles 4c which stick to the floor 6 by van der Waals forces generated by the interaction between their molecules and the floor 6 after a long period of descent under the action of gravity . People area 2 is the part of room 3 where people 1 are always present. Usually it is defined as a surface set back 50 cm into the room from the windowed wall 51 , set back 20 cm into the room from the other walls 140 and a space extending up to 180 cm from the floor 6 .

When people 1 move around in the room 3 turbulence and turbulence 7 on the floor level are generated, which in turn creates an ascending turbulent flow 8 which in turn causes some accumulated contamination on the bottom floor 6 level of the occupied area 2 The matter 4b and the adhering particles 4c return to the suspended state. On a smaller scale in room 3 there was a phenomenon similar to the formation of large cloud clusters in the form of cumulus cumulus clouds in weather systems. The light 53 from the lighting 54 installed in the ceiling 20 or coming in through the window 51 shines on the floor 6 to heat it unevenly. As a result, a strong upward convective movement 57 is generated on the floor level, which in turn returns some of the accumulated contaminating floating matter 4b and sticky particles 4c on the floor 6 to a state of mass suspension. These contaminated floating substances (4b, 4c) rise to the upper part of the human area 2, so as to reach the mouths of the people 1 and the area 9 where the people breathe. As a result, the contaminated floating matter (4b, 4c) returned to the suspended state by these phenomena increases the concentration of the contaminated floating matter 4a in the suspended state. Increases the risk of people 1 in room 3 inhaling contaminated airborne substances, thereby increasing the likelihood of people 1 being exposed to microbiological contamination from airborne microorganisms, which can lead to various diseases (such as aspergillosis ,pulmonary disease……).

The prior art widely employs a ventilation method by mixing a primary blowing air jet 19 attached to the ceiling 20 and a suction air 21 similarly attached to the floor 6, both relying on the Coanda effect C. 2 and 3 show how the ventilation method of the prior art uses a built-in ventilation device 65 built in the building containing the room 3 for ventilation. In the prior art, the primary air jet 19 treated with the built-in ventilation device 65 in advance (i.e. heating, cooling, removing pollutants, humidifying, dehumidifying, ...) is blown into the room 3 through the blowing port 10 on the wall, The blowing port 10 is formed on the “treatment” first vertical wall 52 and opens to the room 3 through a blowing surface Ss aligned with the treated vertical wall 52 and close to the ceiling 20 . The primary air jet 19 is blown out along a blowing direction Is (the average value of the average direction of the respective parts of the primary air jet 19 on the blowing surface Ss), and this blowing direction Is can be directed towards the ceiling 20 (or generally as 2 and 3 parallel to the ceiling 20 ), so that the primary air jet 19 adheres to the surface of the ceiling 20 by virtue of the Coanda effect C. Parallel to the primary air jet 19, the polluted air stream 21 is sucked out with a flow rate equal to that of the primary air jet 19 through the suction opening 11, which is formed in the treated vertical wall 52 and through a substantially vertical suction surface (SA) aligned with the same treated vertical wall 52 to the room 3, but in the vicinity of the floor 6 of the room 3. This ensures that the air A is sucked out at the level of the floor 6 in the form of a tapered, close-to-the-floor 6 suction flow 55 which is approximately horizontal, parallel to the surface of the floor 6 and relies on the Coanda effect C is attached to the floor 6. The primary air jet 19 travels outside the occupied area 2 , between the envelope surface 63 of the occupied area 2 and the surface of the ceiling 20 to which it is attached. As a result, the primary air jet 19 follows a long path and gradually mixes with the large volume of room air A before reaching the occupied area 2 . This mixing allows dirty air to be diluted with new air, providing air conditioning and removal of pollutants, which is what ventilation is for. The advantage of this arrangement is that people 1 can feel the most comfortable temperature. The built-in ventilation system 65 includes an outside air handling unit 73, which is typically mounted on the roof of the building. Apparatus 73 is shown comprising a combined blower and suction assembly which operates in a manner conventional in the art to circulate process air. It includes one or more centrifugal or other types of fans (67, 71) for moving the air and establishing an air flow scheme (air flow scheme), heating means 70, air filter 69, and other A mixing cabinet 68 where the fresh air is mixed with the recirculated air. The air treatment device 73 is connected to an air distribution duct 72 opened with the blowing outlet 10 installed on the wall, so that the pre-treated primary air jet 19 can be sent out through the blowing surface Ss. The suction duct 66 connects the wall-mounted suction opening 11 to the inlet of the air treatment device 73 for extracting the dirty and/or polluted suction air flow 21 from the room 3 .

Figure 2 shows the flow path of the air stream (reproduced from Muller) obtained with the prior art in a "short room" 3a, the length L of which is less than about 3 times its width. This results in a "circular" envelope flow B1. It can be seen that in the prior art (when no special measures are taken) an "oblique interfering diverter air flow" Fs occurs which rises from the floor 6 and flows upwards through the occupied area 2 in an oblique direction towards Blowing surface Fs. It should be understood that the "oblique disturbing diversion air flow" Fs rising from the floor 6 can make the accumulated and adhered pollutants 4b, 4c on the floor level return to a suspended state and become a floating substance, and the result is similar to As described with reference to Figure 1. On their upward path these pollutants 4 b , 4 c increase the content of floating pollutants in the room air A in the room 3 . Thus, in the prior art, in the "short room" 3a ventilated with the mixing of attached primary air jets 19, there is an increased risk of contamination by floating microorganisms due to the presence of the "slanted interfering split air flow" Fs up.

Figure 3 shows the flow path of the air stream (modified from Muller's) obtained with the prior art in a so-called "long room" 3b, the length L of which is about 3 times greater than its width. It can be seen that this "long room" 3b is divided into several air zones Z1, Z2, Z3, . . . by several air flows. A "closed" first air circulation B1 is formed in the first zone Z1 similar to the circulation obtained in the "short room" shown in FIG. 2 . It consists of a primary air jet 19 blown along the ceiling 20, and it turns downwards into a pass through the occupied area 2 approximately in the middle of the "long room" 3b before returning horizontally against the floor 6 to the suction surface Sa. inclined split air flow. In addition to the "oblique interfering diverting air flow" Fs also present rising from the floor 6, between the first circular flow B1 and the wall 50 at the other end of the room 3, constituent eddies are generated in successive zones Z2, Z3 Other "closed" air circulations B2, B3, . . . of 12a, 12b. These “enclosed” air circulations B2 , B3 , . . . pass through the occupied area 2 . This second phenomenon occurs because, due to the large length L of the room 3 , the primary air jet 19 breaks away from the ceiling 20 prematurely in a breakaway region 14 . The primary air jet 19 is then no longer attached to the ceiling 20, but can be referred to as a free air stream. This also leads to a series of velocity induction effects 30a, 30b, . ,…. Contaminated floating matter 4a suspended in the secondary eddies 12a, 12b of the "closed" air circulation B2, B3, . . . becomes entrained by the eddies and is kept away from the blowing and Suction surfaces Ss, Sa. However, the suspended contaminated buoyant matter 4a may be transferred between the respective "closed" air circulations B1, B2, B3, . state exists. Therefore, the entire volume of the room 3 is not optimally treated, since the effect of the removal of contamination treatment is reduced in terms of removal of the contaminated floating matter 4a in suspension. Furthermore, it should be understood that the increased number of upward movements caused by the air circulation B1, B2, B3, ... increases the extent to which the contaminated floating matter that has collected and adhered to the surface of the floor 6 returns to suspension, The risk of microbial contamination for persons 1 in the occupied area 2 is thus increased. In order to reduce the risk of microbial contamination via the air, it is advantageous for the "short room" 3a to implement a method of ventilation with mixing with attached primary air jets.

Figures 4a and 4b are schematic representations of the characteristic measures implemented with the method of the invention for a "short room" 3a, the purpose of which is to greatly reduce or even eliminate the "oblique disturbing split air flow" shown in Figures 2 and 3 "Fs phenomenon. This method of the present invention adopts the general principle of the ventilation method shown in FIG. But, the obvious feature of this method of the present invention is to make the average blowing velocity Vs (the average value of the velocity of each part of the primary air jet flow 19 flowing through the blowing surface Ss) lower than the average suction velocity Va (flowing through the suction air The average value of the velocity of each part of the surface Sa, which is sucked into the air flow 21) (Vs<Va).

Although simple, these devices implemented by the present invention can eliminate the phenomenon of "oblique interference split air flow" Fs, so that great advantages can be provided in air flotation decontamination (not achieved in the prior art), with reference to Fig. 5a This can be proved by analyzing Bernoulli's law.

Figure 5a is a detailed schematic diagram showing a portion of a continuously moving air stream. For simplicity, assume that air A is an incompressible ideal fluid that is only affected by gravity. Let us consider the very small portion da of the moving air in this air current vf.

That very small portion of air da belonging to the air flow vf has:

section variable s;

Velocity variable V;

length variable dx;

mass dm; and

Local pressure P.

Assume that the density ρ of air is constant. The acceleration due to gravity is a constant g.

Considered as a first approximation, the total mechanical energy Et of that tiny fraction da of air consists of:

Its kinetic energy Ec=1/2dm×V ² ;

Its pressure potential energy Epr=P×s×dx=β×dm/

And its gravitational potential energy Epe=g×z×dm.

Considered as a first approximation, the total mechanical energy of that tiny fraction da of air is conserved along the moving air flow Vf.

Thus, for the unit mass of air moving along the entire moving air flow vf, the following expression can be derived:

V ² /2+P/r+g×z=Constant

This is an expression of Bernoulli's law and is valid without any loss of energy (to be considered below) along the entire moving air flow vf in the room 3 .

With reference to Fig. 2, prove that need to use measure of the present invention (that is, average blowing velocity Vs must be less than average suction velocity Va) with " proof by contradiction " below, to ensure that in room 3 shown in Fig. 2 " inclined Disturbance of split air flow" Fs phenomenon.

If there is no "oblique disturbing split air flow" Fs phenomenon, then the entire air flow from the blowing surface Ss will enter the suction surface Sa. If one considers many moving air flows vf, then:

From the blowing surface Ss whose average blowing speed is Vs, blowing pressure is Ps, and height is h,

To the suction surface Sa whose average suction speed is Va, suction pressure is Pa, and height is zero,

All of the airflows will be continuous along their length, none of them will be split into many sub-jets. It would be reasonable to apply Bernoulli's law to them in average over the blowing surface Ss and the suctioning surface Sa, then:

Vs ² /2+Ps/r+g×h=Va ² /2+Pa/ρ (average Bernoulli value)

It is important to emphasize: it is the presence of these undispersed airflows vf that enables the application of Bernoulli's law in the average form. Only in this case can it be assumed that the entire air flow vf from the blowing surface Ss can reach the suction surface Sa, and vice versa. This is not right if there is a "slanted interfering diverter air flow" Fs.

However, it is obvious that since the air is blown into the room 3 through the blowing surface Ss and sucked out through the suction surface Sa, Ps>Pa is required.

It is now assumed that Vs>Va. In such a case, it can be seen that the left-hand term (averaged Bernoulli) of the above equation must be greater than the right-hand term of the equation. It must be concluded that the equation obtained by Bernoulli's law cannot be satisfied. This can be expressed as follows:

(There is no "slanted disturbing diverter air flow" Fs in room 3)

and (Vs>Va)

=> can not satisfy the Bernoulli's law (Bernouilli's theorem averaged) that blowing surface Ss and suction surface Sa are averaged.

A mathematical logical transposition of the above expression gives:

Bernoulli's law is satisfied =>

(There is a "slanted disturbing split air flow" Fs in room 3)

or (Vs<Va)

This shows that the measure according to the invention, namely Vs < Va, is a necessary condition for the phenomenon of "oblique interfering split air flow" Fs not to occur in the room 3.

In fact, the real conditions are stricter. In the continuous flow of the moving air flow vf, under the action of external forces such as friction with the walls of the room 3 and especially due to the induction between the primary air jet 19 and the air A in the room 3, the total Part of the mechanical energy is consumed. There is consumption between the two ends of the moving air flow vf, creating a friction head loss ΔH. Bernoulli's law applied to the moving air flow vf and corrected for the effect of this friction head loss becomes:

Vs ² /2+Ps/r+g×h=Va ² /2+Pa/ρ+ΔH (Bernoulli's law considering head loss)

Thus, in order not to have a "slanted interfering diverter air flow" Fs in room 3, it is necessary to:

(Va ² -Vs ² )/2=(Ps-Pa)/ρ+g×h-ΔH

Va ² -Vs ² +2×[(Ps-Pa)/ρ+g×h-ΔH]

Right now:

Va<(Vs ² +2×[(Ps-Pa)/+g×h]) ^1/2

This results in the following conditions:

Vs<Va<(Vs ² +2×[(Ps-Pa)/ρ+g×h]) ^1/2

If the mean suction speed Va is smaller than the mean blowing speed Vs, then a "slanted interfering split air flow" Fs is formed and Bernoulli's law no longer applies in its mean form. If the average suction speed Va is greater than the average blowing speed Vs, then the phenomenon of "inclined disturbing split air flow" Fs will become weaker and gradually tend to zero. The greater the average suction speed Va is greater than the average blowing speed Vs, the more easily the induced phenomenon of increased head loss ΔH occurs due to air mixing in the primary air jet 19 . This second limit above is:

Va＞(Vs ² +2×[(Ps-Pa)/ρ+g×h]) ^1/2

It can be assumed that the Coanda effect C may no longer be established and that the motion that exists is mainly turbulent.

This is of course a proof based on highly simplified assumptions, but it enables an understanding of the importance of adjusting the mean suction speed Va relative to the mean blowing speed Vs and of the simple but practical measure (Vs<Va) proposed by the present invention importance.

Figure 4a shows in a highly schematic way the results obtained by the inventors after carrying out experiments and computer simulations of air flow. This figure shows that the flow path of air A in room 3 is similar to the room shown in Figure 2, but in which the measures recommended by the invention have been taken with respect to the ratio of mean blowing speed Vs to mean suction speed Va. These results obtained from air flow simulation calculations and measurements carried out on a prototype device implementing said measures show that when implementing the proposed measures of the present invention in room 3, it is possible to ensure an average blowing velocity Vs (flowing through the blowing surface The average value of the velocity of each part of the primary air jet 19 of Ss) is lower than the average suction velocity Va (the average value of the velocity of each part of the sucked air flow 21 flowing through the suction surface Sa) (Vs<Va) , greatly attenuated (or even eliminated) the prior art shown in FIG. 2 "oblique interference split air flow" Fs phenomenon. This phenomenon of "oblique disturbing split air flow" Fs is mainly due to the induced force generated by the primary air jet 19 . By increasing the induced force produced by the inhalation flow 21 flowing against the floor 6 while decreasing the induced force produced by the primary air jet 19, the balance of the interaction of these two types of motion makes it possible to rely on The wall effect C keeps the inspiratory flow 21 attached to the floor 6 . The dilution of the air in room 3 is closely related to the air flow at the blowing outlet on the blowing surface Ss and the suction inlet on the suction surface Sa. The purpose of the present invention is not to increase the dilution efficiency (approaching 100%), but to improve the quality of contaminant removal. Now that the "oblique interfering diversion air flow" Fs is eliminated, the microbial contamination is mainly confined to a very thin, highly contaminated air, since this air flow phenomenon that causes the contaminated floating matter 4 to enter the manned area 2 will no longer occur. The bottom layer Cc will not enter the breathing zone 9 of people 1, thereby reducing the possibility of people being contaminated by microorganisms.

FIG. 4b is a perspective view of the arrangement implemented in the room 3 for implementing the measures according to the invention in a built-in ventilation system 65, showing the effective blowing surface Sse and the effective suction surface Sae. Wall-mounted blowing openings 10 and suction openings 11 used in built-in ventilation systems 65 are generally equipped with blowing and suction grilles 60, 61 which occupy the blowing surface Ss and the suction surface Sa and partially obstruct the air flow. flow. These grills are made of metal plates with many holes or metal frames with many unidirectional slats and/or other means which partly block the corresponding openings 10, 11 while allowing air to flow through. The effective areas Sse, Sae of the grilles 60, 61 refer to the areas of the empty flowable spaces which have the same air flow characteristics for the fluid velocity Vs, Va and pressures Ps, Pa of the fluid passing through them. The grilles sold on the market are generally accompanied by specifications giving their effective area. Alternatively, the effective area can be measured empirically. In Fig. 4b, the blowing grid Ss and the effective blowing surface Sse are shown, and the suction grid Sa and the effective suction surface Sae are also shown. It can be seen that it can be ensured that the effective air blowing surface Sa of room 3 is larger than the effective air suction surface Sae. This ensures that the average blowing velocity Vs is smaller than the average suction velocity Va. It can also be seen that the primary air jet 19 coming out of the blowing surface Ss adheres well to the ceiling 20 by virtue of the Coanda effect C. The suction flow 55 of the suction flow 21 attached to the floor 6 also adheres well to the floor 6 by virtue of the Coanda effect C. Room 3 does not have "slanted disruptive diverter air flow" Fs.

Figure 5b represents the numerical simulation conditions for the air flow characteristics, a simulation carried out for a PLASMAIR ^™ stand-alone airborne decontamination device (airborne decontamination device) 101, which is operated in room 3 according to the present invention with different effective The effective blow ratio RS works. The term "blowing ratio" is the ratio between the effective blowing surface Sse and the effective suction surface Sae. Numerical simulations were carried out under the following conditions:

Room length L=4m;

Room width l=3m;

room height = 2.5m; and

Air flow: Qv=500 cubic meters per hour (m ³ /h).

As shown in Fig. 5b, coordinate axes X, Y and Z were used in the simulation, with the respective points P=P1, P2, . . . P8 positioned 2 cm above the floor 6 surface. The amount of digital calculation (velocity in the Y direction) represents the local digital average value of the vertical component of the air velocity obtained at each point P=P1, P2...P8, each point to the front 165 of this air flotation decontamination device 101 The distances are respectively d=d1, d2, . . . d8. This is the average value of the vertical component of the air velocity in a cubic volume consisting of nine individual cubic nodes, which are used for simulation purposes and lined up, each centered at the simulation point P superior. The air flotation decontamination device 101 is placed against the middle of the treated wall 52 . An E-K energy model is used to establish the air motion equation according to the Navier-Stokes equation. Although the flow regime under consideration is turbulent, the state of motion is studied on a spatial scale much larger than the Kolmogorov scale (description of the molecular type) used for fluid particles , so the Navier-Stokes equation can indeed be applied. The digital simulation employs smoothing of the motion of air molecules. It has been found in the past that the application of this numerical simulation method is reliable as long as the fluid velocity remains below Mach 13, and the reverse has not been reported so far. That's the case here. The type of nodes chosen is hexagonal, giving a simple construction of room 3. Room 3 was modeled with a total of 500,000 nodes. This number is much greater than the 3,000 generally considered sufficient for conducting this type of study. Using the definition of the velocity in the Y direction at each point P, it will be understood that this parameter, which may be positive or negative, represents exactly the rising or falling motion of the air A in the room 3 .

Thus, if the Y-direction velocity of point P is positive, it means that the air velocity near point P at 2 cm above the floor 6 has an upward mean component. In such a case, it can be deduced that there is an airflow mainly upwards from the floor 6 in the vicinity of the point P. From this it can be concluded that there is likely to be a "slanted interfering split air flow" Fs from this point.

Conversely, if the Y-velocity at point P is negative, it means that the air velocity around point P has a downward mean component. From this it can be concluded that it is almost impossible to have a "slanted disturbing split air flow" Fs from this point.

The table in Fig. 5c shows the results obtained by simulation. In this table, the first column is the simulated points P=P1, P2, . . . P8. The second column (shaded) is the case where the air flotation decontamination device 101 is set, and it is set so that the blowing ratio RS (the ratio of the effective blowing area Sse to the effective suction area Sae) is equal to 0.57, which is less than 1. That is to say, this configuration is not within the conditions imposed by the present invention. These are some conditions that may form the "oblique disturbing split air flow" Fs, as predicted by the theoretical analysis given above.

The third column (shaded) corresponds to this 101 adjusted state, which is adjusted so that the blowing ratio RS is equal to 1. This is a limiting configuration as to whether there will be an "inclined interfering split airflow" Fs, as predicted by the theoretical analysis given above.

The second and third columns are shaded to more clearly indicate that their conditions are outside the recommendations of the present invention.

Finally, the fourth column (unshaded) corresponds to the case where the air flotation decontamination device 101 is adjusted to a blowing ratio greater than 1 (RS=1.43). That is, these conditions are within the conditions imposed by the present invention.

Under the condition of Va=0.57Vs in the second column, that is, Va<Vs, it can be seen that: at each point from P4 to P7 away from the air flotation decontamination device 101, the local digital average value of the vertical component of the air velocity is positive. This means that there is an upward air movement in the part of the room 3 away from the air flotation decontamination device 101 . It is reasonable to conclude that the "inclined interfering split air flow" Fs is rising from that part of the room 3 towards the tuyere 110 . Under such conditions, it is very ineffective to use the air flotation decontamination device 101 as an air flotation decontamination system because of the air flow rising from the floor 6.

Under the condition of Va=Vs in the third column, it can also be seen that: at each point from P5 to P7 far away from the air flotation decontamination device 101, the local digital mean value of the vertical component of the air velocity is positive. As above, this means that there is an upward air movement in the part of the room 3 remote from the air flotation decontamination device 101 . It can be concluded that the "oblique disturbing split air flow" Fs is flowing from the far part of the room 3 to the blowing outlet 110 . Under such conditions, because of the air flow rising from the floor 6, the use of the air flotation decontamination device 101 as an air flotation decontamination system is also very ineffective.

On the contrary, under the condition of Va=1.43Vs in the fourth column, ie Va>Vs, it can be seen that at all points P1 to P8, the local numerical mean value of the vertical component of the air velocity is negative. It can be concluded that there is no "slanted interfering diverter air flow" Fs in room 3. Under such conditions, since there is no air flow rising from the floor 6, it is very effective to use the air flotation decontamination device 101 as an air flotation decontamination system.

The ability of the method of the present invention to eliminate "slanted interfering split air flow" can be seen more clearly from the graph of Figure 5d. This graph plots, for each of the three blowing ratios described above, the velocity in the Y direction at various simulated points on the floor 6 in Figure 5b as a function of the position of each point. It can be seen that, for a given blowing ratio RS, the Y-direction velocity curve (Y-velocity > 0) entering the shaded region indicates the presence of a "slanted disturbing split airflow". The proof of these numbers makes it possible to draw a conclusion: the condition Va>Vs recommended by the present invention, or equivalently speaking, the effective blowing area Sse is greater than the effective suction area Ssa, is considered unavoidable by those familiar with the art in the past. The aspect of "oblique interfering split air flow" Fs is effective.

The principles of the method of the present invention capable of overcoming the deficiencies of the prior art can be advantageously implemented in the PLASMAIR ^™ stand-alone air flotation decontamination device 101 . An independent mobile air flotation decontamination device 101 of the present invention is shown in Fig. 6, and it can be installed in a short room 3a, in order to implement the primary air jet flow 19 and suction attached by relying on the Coanda effect C of the present invention Airflow 21 mixed ventilation method. The air flotation decontamination device 101 includes a vertical ventilator device 103 arranged vertically. It is designed to be able to be placed approximately parallel to the treated first vertical wall 52 of the short room 3a being treated. The ventilator device 103 has a first end 104 for suction at the bottom, which is close to, but spaced from, the floor 6 of the short room 3 with its bottom. The ventilator device 103 also has a second end 105 for blowing air at the top, which is located at an elevated position. It is designed to be positioned on top of the short room 3a, close to but spaced from the ceiling 20. The air flotation decontamination device 101 is equipped with a device 106 for making the air A flow. This device is installed inside the vertical ventilator device 103 . It is able to establish a pressure difference ΔP=Ps-Pa between the top end 105 of blowing and the bottom end 104 of suction in order to move the air A outside the device. They also serve to move the air Ac, Ad in the ventilator device 103 . A surface effect air inlet nozzle 118 at the floor 6 protrudes from the suction end 104 of the ventilator device 103 . It is installed facing the floor 6 of the short room 3a. The air inlet 118 provides a suction port 111 having a suction surface Sa close to the floor 6 . The suction surface Sa has a substantially vertical inlet section 109 . This suction surface Sa consists of an empty annular space, but it is shaded in order to show it more clearly. It is represented in the lower right corner of Figure 6 in a flattened and expanded manner. It works at the level of the floor 6 and sucks in the air in the suction flow 55 that is substantially horizontal, parallel to the floor 6 and attached to the floor 6 by the Coanda effect C. The inspiratory flow 55 can be seen more clearly in Fig. 6e. A surface effect blownozzle 129 adjacent to the ceiling 20 is located at the blow end 105 of the ventilator device 103 . It is designed to be mounted close to the ceiling 20 . It provides a tuyere 110 at its top. The tuyere 110 is a porous blowing surface Ss, which is arranged substantially forwardly and laterally on the respective edges 119a, 119b, 119c and 119d of the tuyere 110 . This is shown on a larger scale in the upper right corner of Figure 6. The blowing port 110 acts through its entire blowing surface Ss to generate an upwardly (or horizontally) oriented primary air jet 19, so that the primary air jet 19 is blown onto the ceiling 20 (or parallel thereto), so as to rely on the Coanda Effect C attaches the blown primary air jet 19 to the ceiling 20 . The pollutant removing device (filtering and/or destroying) 127 that is used to act on the contaminated particles 4a, 4b, 4c in the air A is installed in the vertical ventilator device 103, between the air inlet nozzle 118 and the blowing nozzle 129 between. This device further divides its section S inside the ventilator device 103 to force the polluted air Ac to flow through the section between the upstream polluted area 113 and the downstream area 114, in which section at least partially Contaminants in the air Ad are removed. This air flotation decontamination device 101 also has a feature, that is, the effective suction surface Sae (shown in the lower right corner) of the suction surface Sa of its air inlet nozzle 118 is smaller than the effective blowing surface Sse of the blowing surface Ss of the blowing port 110. In this way, the average blowing velocity Vs (the average value of the velocity of the air jet flowing over the blowing surface Ss) is lower than the average suction velocity Va (the average value of the velocity of the sucked air stream flowing over the suction surface Sa) (Vs<Va).

Referring to FIG. 6 , it can be seen that the air flotation decontamination device 101 attaches the pretreated primary air jet 19 to the ceiling 20 . The primary air jet 19 then breaks away from the ceiling 20 at the other end 14 of the short room 3a, which causes the primary air jet 19 to flow along the wall 50 at the other end. Finally, the primary air jet 19 reaches the floor 6 where it becomes the suction flow 21 attached to the floor 6 by virtue of the Coanda effect C.

Referring to Figures 6a and 6b, the internal and external components of the self-contained air flotation decontamination device 101 can be clearly seen. The vertical ventilator device 103 is installed in the shell 126 of the air flotation decontamination device 101 . When the air flotation decontamination device 101 is working, the polluted air Ac in the room 3 enters the bottom suction end 104 of the ventilator device 103 facing the floor 6 through the surface effect air inlet 118 at the floor 6 . Therein lies the suction pressure Pa. The contaminated air Ac then passes through a coarse pre-filter 120 where large particles that may impair the proper functioning of the air flotation decontamination device 101 are removed from the contaminated air Ac. The contaminated air Ac then passes through a noise reduction system 122 to prevent noise from being transmitted through air or solids. This system consists of a number of parallel baffles 107, 108 mounted in two groups on either side of the air drive 106 to avoid noise transmission in the air or solids. Air drive means 106 is preferably a centrifugal fan. The contaminated air Ac is then forced through a decontamination device 127 where the contaminants are at least partially removed. The air Ac from which contaminants have been removed reaches the blowing tip 105 and is blown out through the blowing port 110 . The air Ac from which pollutants have been removed flows out of the air flotation decontamination device 101 through the blowing port 110, and the pressure at the blowing port 110 is the blowing pressure Ps. An on/off system 124 can be used to put the working parts of the air flotation decontamination device 101 into operation or out of use. The bottom of the air flotation decontamination device 101 is equipped with four wheels, making it mobile. It can be easily pushed through the door from room 3 to another room. The system 123 for regulating the air volumetric flow through the air flotation decontamination device 101 makes it possible to adapt the flow to the pollutant removal requirements and to the size of the room 3 .

Referring to FIG. 6c, it can be seen that the combined effect of the pre-treated primary air jet 19 attached by means of the Coanda effect C and the suction flow 21 also attached by means of the Coanda effect C makes the entire occupied area in the short room 3a 2 is covered. Referring to Fig. 3, it can be seen that the independent mobile air flotation decontamination device 101 installed in the short room 3a and set to work according to the present invention enables The flow 19 and the suction flow 21 ventilate the short room 3a while at the same time avoiding the phenomenon of "oblique interfering split air flow" Fs as explained above.

Referring to Fig. 6d, it can be seen that the air flotation decontamination device 101 of the present invention makes it possible to suck in all the contaminated floating matter in the suspended state 4a near the floor 6 and the polluted bottom air at a very thin height next to the floor 6 All accumulated contaminating floating matter 4b, 4c in Cc, and this absorption process proceeds gradually as the floating matter sinks (a phenomenon described earlier with reference to Figure 1). This is done by the suction flow 21 attached to the floor 6 .

The contaminated floating matter 4a, 4b adjacent to the inhalation flow 21 and contained in the inhalation flow 55 is continuously drawn to the inhalation flow 21 attached to the floor 6 by the suction induction effect (suction induction effect) Ias, and then passes through the inhalation flow. Port 111, and underwent decontamination process.

In this way, the air flotation decontamination device 101 of the present invention can reduce the number of sinking contaminated particulate matter 4b, 4c by continuously removing the particulate matter.

Thus, the process of depositing dust on the floor 6 is very slow and the room 3 does not have to be cleaned frequently.

The method of the present invention is also very effective in preventing the already deposited contaminated particles 4b, 4c from rising into suspension (due to convection or disturbance, etc.).

Also, since there is no "oblique interfering diverting air flow" Fs, the phenomenon that the already settled or accumulated contaminating particles 4b, 4c usually caused by it to rise into suspension again is practically eliminated.

Figure 7 is a schematic diagram showing the overall decontamination effect of an independent air flotation decontamination device 101 installed in a short room 3a and adjusted to work in accordance with the present invention. It can be seen that the contaminated particles 4 in different positions are removed in different ways:

Cs at the top of the room;

Ci at the bottom of the room; and

In the middle of the room Cm.

The primary blowing air jet 19 and the suction flow 21 attached by means of the Coanda effect C cover the entire occupied area 2 in the short room 3a. All contaminated particles 4 in the air A in the room 3a are subjected to the decontamination process.

At the ceiling Cs of the room, suspended contamination particles 4 in the form of contamination flotage are drawn continuously upwards towards the ceiling 20 by the blow induction effect into the primary blowing air jet 19. They are then forced vertically downwards along the wall 50 at the other end and entrained by the inspiratory flow 21 .

In the middle Cm of the room, the particulate matter 4 is basically what comes from emissions associated with people in the occupied zone 2 . Their concentrations are very low. Furthermore, they descend continuously towards the bottom Ci of the room due to the sinking action of gravity 5 .

Finally, at the bottom Ci of the room, suspended contaminated particles 4 in the form of contaminated flotage are continuously drawn towards the floor 6 by the inhalation induced effect (Ias) into the aspirated air stream 21 .

Owing to the absence of the "oblique interfering split air flow" Fs, and the bottom suction induction effect (Ias) caused by the suction flow 21, it is possible to avoid the accumulation of the contaminated air layer Cc already collected at a very thin height. Contaminated floating matter 4b and sticky particulate matter 4c then rise to higher parts Cs, Cm in the room.

As a result, the contaminated particles 4 in each part of the room are quickly taken away by the suction air flow 21, and then enter the air flotation decontamination device 101, and are removed in the state described with reference to FIG. 6d. The decontamination test carried out with ^PLASMAIRTM independent air flotation decontamination device 101 has shown that: its performance and effect of removing pollutants in room 3 are close to those of laminar flow ventilation method, but its cost is only ten times that of the latter one-third.

A first advantageous embodiment of the present invention for a stand-alone air flotation decontamination device 101 is shown in Figures 6d, 6e and 8b. In this scheme, the air inlet nozzle 118 is of the suction type at the floor 6, that is, the suction port 111 has a bottom first suction wall 132, which is almost in contact with the floor 6 or is formed by the floor 6 itself, as shown in the figure shown in 6d. The suction port 111 has a second suction wall 133 on the top surface of a substantially horizontal lip shape, which is formed by a part of the bottom plate 137 of the air inlet nozzle 118 . This ensures that the vertical suction surface Sav is free and is formed by the vertically open annular surface 136 between the bottom plate 137 of the air inlet nozzle 118 and the floor 6 . This ensures that air is sucked in at the level of the floor 6 in the form of an airflow 55 attached to the floor 6 from a planar fan 138 inclined to the suction from the other three walls 50, 140, 144 of the short room 3a. gas, away from the treated vertical wall 52. Furthermore, the vertical suction surface Sav of the suction form air inlet nozzle 118 at the floor 6 is not obstructed. As a result, it appears as an unfolded surface equal to its effective getter surface Sae, as shown in the lower right corner of Fig. 8b. It can be seen that the effective suction surface Sae is smaller than the effective blowing surface Sse at the blowing surface Ss of the blowing port 110 (as shown in the upper right corner of FIG. 8b ). This specific arrangement of this first solution enables a simultaneous improvement of the floor effect with respect to the suction and the contaminated air substratum Cc of a very thin height, while at the same time enabling the limitation of the phenomenon of "oblique interfering split air flow" Fs appear.

A second advantageous embodiment of the present invention for a stand-alone air flotation decontamination device 101 is shown in Figures 8a to 8d. It can be seen in Figures 8a and 8b that the distance from the blow top edge 130 to the floor Ds is greater than 170 cm. This distance is for a room with a standard ceiling height of about 250cm. Complying with this distance ensures the air flow path described with reference to FIG. 6 . Can be seen in Fig. 8 c and 8d: the perforated blowing surface Ss of blowing mouth 110 is provided with a device 163 for guiding the blowing air flow 164 that forms primary blowing air jet 19, and it is controlled with handle 167. This flow-directing means (flow-directing means) 163 can adjust the ejection angle αs of the spray stream that blows out from the blowing port 110 (the average value of the blowing air flow 164 of the primary blowing air jet flow 19 with respect to the angle of the horizontal plane H on the blowing surface Ss value), it can be ensured that this angle is roughly in the range of 20° to 70°. Figures 8e and 8f illustrate the importance of this second arrangement proposed by the present invention. These figures are side views of the air flotation decontamination device 101 placed in the short room 3a, exhibiting the same characteristics as described with reference to Figure 5b. The effect of adjusting the blowout angle αs of the tuyere 110 has been studied by numerical simulation. Fig. 8e corresponds to αs = 20°, Fig. 8f corresponds to αs = 70°. It can be seen that within the recommended angle adjustment range (20°<αs<70°), other arrangement conditions of the present invention are satisfied, and the phenomenon of "oblique interfering split air flow" Fs can be avoided. Figure 8g corresponds to αs < 20° and Figure 8h corresponds to αs > 70°. It can be seen that outside the recommended angle adjustment range (20°<αs<70°), even if other arrangement conditions of the present invention are satisfied, the phenomenon of "obliquely disturbing split air flow" Fs will appear. When αs > 70°, there will be multi-region Z1, Z2 phenomenon, forming multiple air circulation B1, B2, as explained with reference to Fig. 3 for "long room", and there will be "oblique interference split air flow" Fs . At αs < 20° it can be seen that an "oblique interfering split air flow" Fs occurs.

A third advantageous embodiment of a stand-alone air flotation decontamination device 101 proposed by the present invention is shown in Fig. 9b. The effective air blowing surface Sse of the blowing port 110 is at least 20% larger than the effective air suction surface Sae of the air inlet nozzle 118 . In addition, the volumetric flow rate Qv of the air driving device 106 is adjusted so that the average blowing velocity Vs (average value of the blowing jet flowing through the porous blowing surface Ss) is greater than 0.79m/sec, ie Vs>0.79m/sec. Under these arrangement conditions, the average suction velocity Va (average value of the velocity of the sucked-in air flow passing through the suction surface at the air inlet of the porous suction surface) is at least 20% greater than the average blowing velocity Vs, i.e. Va >1.2Vs. When these specific arrangement conditions of the present invention are met, the "slanted disturbing split air flow" Fs can be avoided.

On the contrary, the diagram of Fig. 9a corresponds to the results obtained by numerical simulation in the case of Vs < 0.79 m/sec and Va < 1.2 Vs. It can be seen that in the digital simulation, when the relevant values are outside the above recommended limit values, the multi-zone Z1, Z2 phenomenon will appear, forming multiple air circulation B1, B2, as explained with reference to Figure 3 for the "long room" As expected, and there will be a "slanted disturbing split air flow" Fs. The special arrangement of this third option makes it possible to limit the occurrence of "oblique interfering split air flow" Fs.

The second preferred embodiment of the independent air flotation decontamination device 101 recommended by the present invention is shown in Fig. 10a. In this second embodiment, the blowing nozzle 129 having the porous blowing surface Ss is wider than the average width of the chimney device 103 . Such width is measured perpendicular to the vertical plane of symmetry of the air flotation decontamination device 101 , extending vertically to its front 165 . It is also measured parallel to the treated first vertical wall surface 52 . Thus, the porous blowing surface Ss is larger, thereby increasing the blowing ratio RS to the effective suction area Sae remaining constant. In this way, the blowing speed VS can be greatly reduced relative to the suction speed Va. In order to reduce the possibility of "oblique interfering split air flow" Fs.

The implementation of this second preferred embodiment will be described below with reference to Figures 15a and 15b. The blowing nozzle 129 comprises means 157 for widening its transverse dimension. These means consist of at least one (preferably two, as shown in Figs. 15a and 15b) porous flexible cylindrical blowing sections 159, which are arranged on either side of the top of the ventilator means 103. They are arranged perpendicular to the vertical symmetry plane PV of the air flotation decontamination device 101 . When the air drive unit 106 is not actuated, these porous flexible cylindrical blowing portions 159 hang down, as shown in FIG. 15a. However, when the air drive 106 is actuated, they are stretched horizontally by the internal pressure. As shown in Figure 15b. In this way, they provide a substantially horizontal movable blowing surface Ss in the extended state 161 .

The porous flexible cylindrical blowing portion 159 may be formed into the shape of the fingertip portion of a glove from a reinforced braided material. The braided material of the sleeve is covered with a protective adhesive strip along a generatrix of the cylinder. Then, an airtight covering material (eg, for tarpaulin) is applied to the outside of the sleeve. Then, the protective adhesive strip is peeled off, and as a result, most of the sleeve is covered with an airtight sealing material. However, a longitudinal surface along a generatrix on each porous flexible cylindrical blowing portion 159 is free of sealing material, so air is allowed to pass through. As a result, a porous surface Spa is formed on the part of the surface of the sleeve which part occupies that generatrix. The rest of the surface is airtight. This forms the blowing surface Ss which allows the primary blowing air jet 19 to blow out along that generatrix, ie parallel to the ceiling 20, when the porous flexible cylindrical blowing portion 159 is stretched out. Advantageously, a telescoping reinforcing strip 170 can be used, one end of which is placed in the porous flexible cylindrical blowing part 159, and the other end is fixed to the vertical ventilator device 103. The telescoping reinforcing bar 170 is used to increase the extent to which each porous flexible cylindrical blowing portion 159 protrudes when stretched 161 . The telescopic reinforcing bar 170 is preferably stretched by the pressure inside the air flotation decontamination device 101 . It can be flattened by its elasticity.

Doing so can make the air flotation decontamination device 101 become relatively narrow when it is not in operation, and it is easy to pass through the door. And when the air flotation decontamination device 101 is in the working state, the blowing surface Ss can be stretched so that its width is almost equal to the width of the room 3 . As a result, the blowing air flow can spread over the entire width of the room 3 . This results in better decontamination.

A third preferred embodiment of the independent air flotation decontamination device 101 recommended by the present invention is shown in Fig. 10b. The porous air blowing surface Ss includes a front air blowing surface Ssf extending to both sides, and the side blowing surfaces Sslg and Ssld are respectively formed on the two side walls 135 of the blowing nozzle, for facing the lateral wall 140, 144. This arrangement can increase the effective blowing surface Sse and treat the side areas of the room 3 along the walls 140, 144 more effectively. This also helps to eliminate the "slanted disturbing split air flow" Fs phenomenon.

The fourth preferred embodiment of the independent air flotation decontamination air flotation decontamination device 101 recommended by the present invention is shown in FIG. 11 . The intake nozzle 118 of the suction type at the floor has a top wall 139 which is wider than the average width of the vertical chimney arrangement 103 and which extends downward. This widening is measured perpendicular to the vertical plane of symmetry PV of the air flotation decontamination device 101 , whereas the plane of symmetry PV is perpendicular to the front part 165 of the air flotation decontamination device 101 . In this way, the two side walls 141 are farther away from the air inlet nozzle 118 .

A fifth preferred embodiment of the independent air flotation decontamination device 101 recommended by the present invention is shown in Figures 10a, 10b, 12, 13a and 13b. The air inlet nozzle 118 has a bell-shaped bottom 143 in the shape of a tulip flower, and it faces the floor 6 . Numerical simulations have also shown that this arrangement helps to better eliminate the "slanted disturbing split air flow" Fs phenomenon.

A sixth preferred embodiment of the independent air flotation decontamination device 101 recommended by the present invention is shown in FIG. 12 . The middle part of the vertical ventilator device 103 has a longitudinal dimension DL in the vertical symmetry plane PV of the air flotation decontamination device 101 , which is smaller than the longitudinal dimension DLS of the air inlet nozzle 118 . These two dimensions are measured parallel to the vertical plane of symmetry PV of the air flotation decontamination device 101 , while the symmetry plane PV is perpendicular to the front part 165 of the air flotation decontamination device 101 .

A seventh preferred embodiment of the independent air flotation decontamination device 101 recommended by the present invention is shown in Figures 13a and 13b. The vertical ventilator assembly 103 includes a length-adjustable shaft portion 147 . This adjustable barrel portion can be formed with bellows 149 . This structure makes it possible to adapt the height of the porous blowing surface Ss to the height of the room 3 . As a result, the air flotation decontamination device 101 can be used in rooms 3 of different heights in various buildings, so as to ensure that the primary air jet 19 is attached by relying on the Coanda effect C by elongating 152 in the height direction (as shown in Figure 13b). 20 on the ceiling of the room. Shortening the height-adjustable barrel portion 147 allows the air flotation decontamination device 101 to pass through the door of the room 3 in the shortened state 151 (as shown in FIG. 13 a ).

An eighth preferred embodiment of the independent air flotation decontamination device 101 recommended by the present invention is shown in Figures 14a and 14b. The air flotation decontamination device 101 has an auxiliary air inlet nozzle 155 formed on the front of the ventilator device 103 . The auxiliary air inlet nozzle 155 is located at about half the height (about 1 m from the floor). The auxiliary air inlet nozzle 155 opens into the ventilator device 103 upstream of the device 127 for clearing contaminated particles, ie into the contaminated upstream area Ac. This arrangement can remove pollutants in the air near the auxiliary air inlet nozzle 155 . A person with particulate matter 4 releases particulate matter in suspension. When people are hospitalized for treatment, people generally lie on a sickbed, and their breathing zone is at a height of about 1m. This preferred embodiment with such an auxiliary air inlet nozzle 155 can be used to directly treat the discharge containing floating matter discharged by persons in the area Cm shown in FIG. 7 .

Objects and advantages of the invention

The purpose and advantage of the present invention is to reduce or even eliminate the phenomenon of "inclined disturbing split air flow" that is considered necessary in the prior art with the ventilation method of the present invention, and this ventilation method is by utilizing the Coanda effect C attached to the ceiling Ventilation is carried out by mixing the primary air jet and the suction flow attached to the floor.

A second advantage of the present invention is that it reduces the occurrence of contaminating particles that have settled in the room and then rise into suspension.

A third advantage of the present invention is the ability to absorb buoyant matter in suspension and that accumulates as it settles in thin layers of contaminated air near floor level.

A fourth advantage of the present invention is the ability to reduce the amount of contaminated particles sticking to the floor, thereby reducing the frequency of room cleaning.

A fifth advantage of the present invention is the ability to reduce the concentration of contaminating buoyant matter suspended in occupied areas of the room.

A sixth advantage of the present invention is that it can reduce the occurrence of diseases caused by microbial contamination in the floating material in the room.

A seventh advantage of the present invention is to provide a ventilation system using attached air jets for mixing, which has performance close to that of laminar ventilation at a fraction of the cost in removing contaminants from a room. an order of magnitude smaller than the latter.

An eighth advantage of the present invention is to provide a system for removing floating contaminants with a high degree of cleanliness and which can be mobile.

A ninth advantage of the present invention is the ability to quickly take action on premises that are not equipped to prevent microbial contamination. This applies equally to family wards, prevention of various epidemics, provision of public health care, production of medicines and food.

A tenth advantage of the present invention is to provide a mobile device suitable for capturing and removing floating contaminating particles close to the floor and avoiding bringing them back into suspension. This is especially important for those hypersensitive (allergic) patients.

An eleventh advantage of the present invention is the speed of ventilating a room and removing contaminants using a hybrid approach.

Industrial Applicability of the Invention

The present invention optimizes the process of decontaminating a room and removing airborne contaminant particles from the room at reduced cost. Thus, the present invention has industrial applicability to any type of enclosed building where removal of airborne contaminants is required. It can be used in: health care, food industry, scientific research, transport industry, animal husbandry, pharmaceutical industry, schools, ... just to name a few.

Particularly suitable applications are for the removal of airborne substances in patient rooms, protecting patients and people in hospital environments from the risk of cross-contamination. This is about providing protection against the dangers of SRAS (Severe Acute Respiratory Syndrome) type infectious diseases in hospitals, … .

Another application is the temporary countermeasure of certain consequences of the conventional ventilation of professional, public and domestic premises which lead to an infection risk from the floating substances conveyed by the air conditioning system. This concerns the partial protection of a room in a ventilated building against infection and/or cross-contamination (sick building syndrome) caused by the building's central air-conditioning system.

It can also be applied to means of transportation for transporting passengers by sea and air.

It can also be used in industries where there is a local risk of microbial contamination associated with the production of contaminated preparations, eg in the pharmaceutical and food industries. It can also be applied to experimental facilities for microbiological research.

It can also be used to protect high-density livestock (chickens, pigs, ...), keeping them in a healthy condition, especially on farms where unauthorized access is restricted (for selective breeding).

It can also be used for public protection in the event of a bioterrorist attack.

It is also widely applicable in cafes and restaurants to limit the risk of contagion between customers and/or between customers and service personnel.

It can also be applied to prevent the spread of epidemics in nurseries, kindergartens, schools, and those small but crowded rooms.

Finally, it can also be applied to protect workers and visitors in dental clinics, medical examination places, etc.

It should be appreciated that the scope of the present invention is defined by the appended claims and their legal equivalents, rather than by the examples given above.

Claims (18)

1. One is carried out by relying on a primary air jet (19) attached to the ceiling (20) by relying on the Coanda effect C and a suction air flow (21) attached to the floor (6) by relying on the Coanda effect (C) A method of mixing to ventilate a room (3) comprising: a) A primary air jet (19) pretreated (heating, cooling, decontamination, humidification, dehumidification, ...) is blown into the room (3) as follows: i) by a blowing surface (Ss) aligned with a treated side wall (52) positioned near said ceiling (20); and ii) along a blowing direction Is (the average direction of the individual parts of the primary air jet (19)) oriented towards said ceiling (20) (or parallel to it) on the blowing surface (Ss) ), and cause the primary air jet (19) to attach to the ceiling (20) by virtue of the Coanda effect (C); and, then b) Intake of a dirty suction air stream (21) at a flow rate equal to the flow rate of said primary air jet (19) as follows: i) by means of a suction surface (Sa) positioned adjacent to said floor (6) of said room (3), substantially aligned with said treated side wall (52); ii) Ensure that an inspiratory flow (55) of air (A) is drawn in near the floor (6), said inspiratory flow (55) being: approximately horizontal; and parallel to the surface of said floor (6) and attached to said floor (6) by means of a Coanda effect (C); This method of ventilation is also characterized by: c) Ensure that the average blowing velocity (Vs) [average of the velocities of the individual parts of the primary air jet (19) flowing over the blowing surface (Ss)] is lower than the average suction velocity (Va) [flowing over the suction surface ( Sa) the average value of the velocity of the various parts of the sucked air flow (21)] (Vs<Va). 2. Ventilation of a room by mixing primary air jets (19) attached by means of the Coanda effect (C) and suction air streams (21) attached by means of the Coanda effect (C) as claimed in claim 1 The method is further characterized by: a) Make the effective blowing surface (Sse) larger than the effective suction surface (Sae) 3. A room (3) that implements the method described in claim 1 by utilizing a primary air jet (19) attached by virtue of the Coanda effect C and a suction air attached by virtue of the Coanda effect (C) A separate air flotation decontamination device (101) for the method of mixing the streams (21) to ventilate the room, said device (101) comprising: a) vertically placed ventilator device (103) [placed approximately parallel to and close to a treated first vertical wall (52) of said room (3) being treated], said ventilator device ( 103) including: i) a bottom suction first end (104) located at its bottom close to and spaced from said floor (6) of said room (3); and ii) a top blower second end (105) located at the top of said room (3) close to said ceiling (20) and spaced therefrom; b) Drive means (106) for moving the air, said drive means being arranged in said ventilator means (103) and capable of establishing said top blowing end (105) and said bottom suction end (104) ) between a positive pressure differential (ΔP) to enable air to flow into and out of said ventilator means (103); c) a surface effect air inlet nozzle (118) protruding from the bottom suction end (104) of the ventilator device (103) at the floor (6) facing the room (3 ) floor (6), its suction port (111) is close to said floor (6), the suction port: i) have a suction surface (Sa) approximately perpendicular to the suction inlet; and ii) Intake of air (A) at the level of said floor (6) in the form of an inspiratory flow (55) which is: approximately horizontal; and parallel to said floor (6) and attached to said floor (6) by means of a Coanda effect (C); d) said top blowing end (105) [located close to said ceiling (20)] protruding from said ventilator means (103) at said ceiling (20) and formed on top of it A surface effect blowing nozzle (129) of the blowing port (110), the blowing port: i) having a porous blowing surface (Ss) arranged generally forward and having four lateral edges (119a, 119b, 119c, 119d); and ii) generating a primary air jet (19) through the entire blowing surface (Ss), said jet oriented obliquely upwards or horizontally [to blow towards or parallel to said ceiling (20)] so that said primary The air jet (19) can be attached to the ceiling (20) by virtue of the Coanda effect (C); and e) A decontamination device (127) for removing contaminating particles in the air (A) (by filtering out and/or destroying them), which decontamination device: i) installed in said ventilator device (103) and between said air inlet nozzle (118) and said blowing nozzle (129); and ii) across the section (S) of said ventilator means (103) dividing it internally to force contaminated air (Ac) between a contaminated upstream area (113) and a downstream area A section between (114) flows through the contaminant removal device, in which section air (Ad) is at least partially removed contamination; The device (101) of air flotation decontamination is also characterized in that: f) The effective area (Sae) of the suction surface (Sa) of the air inlet nozzle (118) is less than the effective area (Sse) of the blowing surface (Ss) of the blowing port (110), so that the average blowing speed ( Vs) [the average value of the velocity of the various parts of the primary air jet (19) flowing through the blowing surface (Ss)] is lower than the average suction velocity (Va) [the sucked air flow flowing through the suction surface (Sa) (21) The average value of the speed of each part] (Vs<Va). 4. As claimed in claim 3, for a room (3) implementing claim 1 by using a primary air jet (19) attached by means of the Coanda effect (C) and relying on the Coanda effect (C) (C) A self-contained air flotation decontamination device (101) for a method of mixing attached suction air streams (21) to ventilate the room, further characterized by the combination of: a) First of all, its air inlet nozzle (118) is of the air suction type at the floor (6), that is, there is an air suction port (111), and this air suction port: i) There is a bottom first suction wall (132): this wall is actually in contact with said floor (6); or This wall is formed by said floor (6) itself; ii) and, there is a top second suction wall (133) formed by a part (134) of the bottom plate (137) of said inlet nozzle (118); iii) In this way, its vertical suction surface (Sa) is unobstructed and is formed by a vertical annular open surface formed between the bottom plate (137) of said air inlet nozzle (118) and said floor (6) (136) constitutes; and iv) for sucking air at the level of said floor (6) in the form of an airflow (55) attached to said floor (6) from a plane fan (138) obliquely facing said suction and three other walls (50, 144, 140) from said room (3) in addition to said treated wall (52); and b) Secondly, the vertical suction surface (Sav) of the air inlet nozzle (118) at the floor (3) is smaller than the effective blowing surface of the blowing surface (Ss) of the blowing port (110) (Sse). 5. As claimed in claim 3, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) (C) A self-contained air flotation decontamination device (101) for a method of mixing attached suction air streams (21) to ventilate the room, further characterized by the combination of: a) the top edge (142) of said perforated blowing surface (Ss) is positioned at a height above said floor (6) of greater than 170 cm [suitable for a room (3) of standard height of about 250 cm]; and b) said porous blowing surface (Ss) of said blowing nozzle (110) is provided with mechanically adjustable guides (163) for guiding the blowing air flow (164) constituting said primary air jet (19) ), the angle (αs) of the direction of the air flow coming out from the said blowing nozzle (129) relative to the horizontal direction (H) The average value on ] is in the range of 20° to 70°. 6. As claimed in claim 3, for a room (3), implementing claim 1, by using primary air jets (19) attached by means of the Coanda effect (C) and relying on the Coanda effect (C) A self-contained air flotation decontamination device (101) for a method of mixing attached suction air streams (21) to ventilate the room, further characterized by the combination of: a) At first, the effective blowing surface (Sse) of the blowing surface of the blowing nozzle (129) and the size of the air driving device (106) are determined to make the average blowing velocity (Vs) at the blowing nozzle (129) place ) [the average value of the velocity of the primary air jet flowing through the porous blowing surface (Ss))] greater than 0.79m/sec [Vs > 0.79m/s]; and b) secondly, the effective blowing area (Sse) of the blowing surface of the blowing port (110) is 20% smaller than the effective suction surface (Sae) of the suction surface of the air inlet nozzle (118), so The average suction velocity (Va) [average value of the velocity of the air stream (21) sucked in at the inlet of the porous suction surface (Sa)] can be made 20% greater than the average blowing velocity (Vs) ( Va>1.2Vs). 7. As claimed in claim 3, for a room (3), implementing claim 1, by using primary air jets (19) attached by means of the Coanda effect (C) and relying on the Coanda effect (C) (C) Independent air flotation and decontamination device (101) for the method of mixing attached suction air flow (21) to ventilate the room, also characterized in that it supports said porous blowing surface (Ss) The blowing nozzle (129) is wider than the vertical ventilator device (103) extending upwards [measured perpendicular to the vertical plane of symmetry PV of the device (101), while the vertical plane of symmetry PV is perpendicular to the front (165) of the device (101 )]. 8. As claimed in claim 3, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) An independent air flotation decontamination device (101) for the method of mixing attached suction air streams (21) to ventilate the room, further characterized in that the porous blowing surface (Ss) has a The forward blowing surface (Ssf) and the lateral blowing surfaces (Sslg and Ssld) extending laterally and shaped on the side wall (135) of the blowing nozzle (129) face the two blowing surfaces respectively. The side walls (140, 144) of the chamber (3). 9. As claimed in claim 3, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) (C) An independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, and it is also characterized in that: the air inlet nozzle (118) is placed on the Its top wall (139) widens to its width greater than the average width of the vertical ventilator device (103) extending downwards [measured perpendicular to the vertical symmetry plane PV of the device (101), while the vertical to the plane of symmetry PV perpendicular to the front (165) of the device (101)] 10. As claimed in claim 4, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) An independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, and it is also characterized in that: the air inlet nozzle (118) includes a A flared bottom (143) in the shape of a tulip flower, which is placed in alignment with said floor (6). 11. As claimed in claim 3, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) An independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, characterized in that: the vertical ventilator device (103 ) has a longitudinal dimension DL (size) in the vertical symmetry plane PV of the device (101), which is smaller than the longitudinal dimension DLS of the air inlet nozzle 118 [parallel to the vertical direction of the device (101) The plane of symmetry (PV) is measured perpendicular to the front (165) of the device (101)]. 12. As claimed in claim 3, for a room (3), implementing claim 1, by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) (C) An independent air flotation decontamination device (101) for the method of mixing attached suction air streams (21) to ventilate the room, further characterized in that it includes an auxiliary air inlet nozzle (155) , the air inlet nozzle: a) arranged at the front of said ventilator device (103); b) at about half the height (about 1 m from said floor (6)); and c) open to the interior of said ventilator means (103), to the contaminated area (Ac) upstream of said means for removing contaminated particles (127). 13. As claimed in claim 3, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) (C) An independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, and it is also characterized in that: the ventilator device (103) includes a Trunk section (147), the length of which is adjustable [specifically, by means of a bellows (149)], which allows the height of the perforated blowing surface (Ss) to be adjusted according to the height of the room (3) The height is changed so that the primary air jet (19) is attached to the ceiling (20) while enabling the device (101) to pass through a door of the room (3). 14. As claimed in claim 3, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) (C) an independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, and it is also characterized in that: the blowing nozzle (129) includes a Means (157) for increasing its lateral dimension, which allow lateral extension of the blowing surface (Ss) of said blowing nozzle (129). 15. As claimed in claim 14, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) an independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, and it is also characterized in that: the blowing nozzle (129) includes a The device (157) that increases its lateral dimension, this device is made of at least one (preferably two) porous flexible cylindrical blowing parts (159), these (two) parts are: a) laterally with respect to said ventilator device (103) at its top and perpendicular to the vertical plane of symmetry PV of said device (101); and b) Can be stretched under the action of pressure (Ps) to form a movable blowing surface (Ss), which is substantially horizontal in the stretched state (161). 16. As claimed in claim 15, for a room (3), implementing claim 1, by using primary air jets (19) attached by means of the Coanda effect (C) and relying on the Coanda effect (C) An independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, further characterized in that: said porous flexible cylindrical blower Section (159) includes: a) a porous surface (Spa) over a part of its surface for forming a blowing surface (Ss) from which a primary blowing jet (21) can also be blown; and b) an air-impermeable surface (SE) on the remainder of its surface. 17. As claimed in claim 15, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) Independent air flotation and decontamination device (101) for the method of mixing attached suction air flow (21) to ventilate the room, further characterized in that it includes at least one telescoping reinforcing bar device (170), one end of the device is placed in the porous flexible cylindrical blowing part (159), and the other end is fixed to the vertical ventilator device (103). 18. As claimed in claim 17, for a room (3) implementing claim 1 by using primary air jets (19) attached by means of the Coanda effect (C) and by means of the Coanda effect (C) An independent air flotation decontamination device (101) for the method of mixing the attached suction air flow (21) to ventilate the room, and it is also characterized in that: the telescopic reinforcing strip device (170 ) is stretched out depending on the pressure inside the device (101).

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