DE20300376U1 - Method for mixing room and outside air in room ventilation system has control flap between outside and inside air intake openings - Google Patents

Abstract

A fan (10) draws air from the outside of a room through an opening (5) and delivers it to the room through an opening (7). A further air intake opening (11) in the room, on the fan suction side (3), allows partial recirculation of room air controlled by a flap (13).

Description

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSER£sRA§SE 14CT ·

Attorney file: 02 376 / 8 kü

Gebrüder Trox, limited liability company, Heinrich-Trox-Platz 1, 47506 Neukirchen-Vluyn

Ventilation system for room ventilation

The invention relates to a ventilation system for room ventilation with an air duct extending between an air inlet opening preferably on the outside of the building and an air outlet opening preferably on the inside of the room, wherein an air conveying device and a further air inlet opening for sucking in air located above the air duct, in particular room air, are provided in the air duct.

Such ventilation systems, which have an air duct with an air inlet opening preferably on the outside of the building and an air outlet opening preferably on the inside of the room and an air conveyor located in the air duct, are used, for example, as underfloor or parapet devices. They also have a further air inlet opening through which air located above the air duct, usually room air, is inductively sucked in. This further air inlet opening is provided on the downstream side of the air conveyor, i.e. behind the air conveyor in the direction of flow, in the air duct. In order to achieve a high induction to achieve high suction performance in the area above the further

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSER«§TRASSE 140 · *ö-47803 ^# KREFELD

To achieve the desired air intake opening, the air must be blown out of the air conveyor at a high blow-out speed. The air conveyor therefore has nozzles. The disadvantage is that such ventilation systems are noisy due to the high blow-out speeds.

The object of the invention is to improve a ventilation system of the previously known type in such a way that it has lower sound emissions and is thus quieter and also more energy-efficient.

This object is achieved in that the additional air inlet opening is arranged on the intake side of the air conveying device in the air duct. By arranging the additional air inlet opening on the intake side, i.e. in front of the air conveying device in the direction of flow, the air conveying device can be operated at a lower pressure level, so that the total air volume flow conveyed, consisting of the air volume flow sucked in via the air inlet opening and the air volume flow sucked in via the additional air inlet opening, is blown out of the air conveying device at a low flow rate. Due to the lower pressure conditions and the lower flow rate, the ventilation system according to the invention is quieter and more energy-efficient, since the pressure build-up to achieve high nozzle speeds is not necessary as in the prior art.

In order to influence the ratio between the air volume flow drawn in via the air inlet opening, which is preferably on the outside of the building, and via the additional air inlet opening, the flow cross-section of the additional air

DR. STARK & PARTNER PATENT ATTORNEYS · M0ERSER«9TRAESSE 14(J · *ß-47803*KRE*FELD

inlet opening for determining the air flow sucked in via the additional air inlet opening can be changed and/or closed by means of a closing device, in particular by means of a flap. If, for example, the closing device enables the additional air inlet opening to be completely closed, when the additional air inlet opening is closed, only air is sucked in via the air inlet opening on the outside of the building and blown out via the air outlet opening, preferably on the inside of the room. The more the closing device frees up the flow cross-section of the additional air inlet opening, the more air located above the air duct is sucked in via the additional air inlet opening. The closing device can be, for example, a slide or a flap, which is pivotably mounted, for example, on a shaft arranged transversely to the flow direction. Other embodiments are of course possible.

The closing device can be actuated by means of an actuating element, in particular by means of an actuating motor.

The actuator can be connected to a temperature measuring device, preferably a temperature measuring device that measures the room temperature, for temperature-controlled actuation of the locking device. A temperature measuring device is useful, for example, if high temperatures prevail outside the room and the air in the room itself is to be cooled down. To save energy, the air flow sucked in through the air inlet opening on the outside of the building is reduced as much as possible by suitable measures, so that a larger proportion of air can be drawn in through the additional air inlet opening by opening the

DR. STARK & PARTNER PATENT ATTORNEYS ■ MOERSER^TRASSE 14(3 · ^# 0-47805*KREFELD

Closing device is used to suck in air. If the air inlet opening on the outside of the building is completely closed, the air is only recirculated.

To compensate for the inlet speed of the air entering through the air inlet opening for actuating the closing device, the servomotor can be connected to a measuring device for determining the air flow speed, preferably to a measuring device that measures the air flow speed in the air inlet opening. Such a measuring device is suitable, for example, for absorbing wind loads acting on building facades. If an increasing air speed is determined by the measuring device provided in the air inlet opening despite the air conveying device not operating as it should, this allows conclusions to be drawn, for example, about a wind load acting on the facade. Suitable measures reduce the air flow entering through the air inlet opening, which is preferably on the outside of the building, and the flow cross-section of the other air inlet opening is increased accordingly by means of the closing device. If the air inlet opening and the other air inlet opening are arranged directly next to each other and at an angle to each other, only one closing device can be provided for both openings, for example. By changing the position of the closing direction, the behavior of the air flow sucked in via the air inlet opening and the second air inlet opening is varied accordingly.

In another embodiment, the closing device can be moved against a force, in particular against a weight or spring force, from its position closing the flow cross-section of the further air inlet opening.

DR. STARK & PARTNER PATENT ATTORNEYS ■ M0ERSER«97RASSE 140* · *D-478o3*KREFELD

Position into the position that releases the flow cross-section of the additional air inlet opening. For this purpose, a tension spring can, for example, act on the closing device, which is usually designed as a flap, on the inflow side. As the air flow sucked in through the air inlet opening that is not closed by the closing element increases, the closing device is opened more and more against the spring force of the tension spring, so that room air is induced through the additional air inlet opening.

Advantageously, the flow cross-section of the air inlet opening can be changed and/or closed by means of a closing device, in particular by means of a flap, to determine the air flow sucked in via the air inlet opening. This allows the air sucked in via the air inlet opening, which is preferably on the outside of the building, to be adjusted as desired. A slide or a flap can be used as a closing device, for example. The flap can be pivotably mounted, for example, on a shaft arranged transversely to the flow direction.

The closing device can be actuated by means of an actuating element, in particular by means of an actuating motor.

The actuator of the closing device in the air inlet opening can be connected to a temperature measuring device, preferably to a temperature measuring device that measures the outside temperature, for temperature-controlled actuation of the closing device. In cooling mode, the air flow sucked in via the air inlet opening can thus be reduced if a certain temperature is exceeded.

DR. STARK & PARTNER PATENT ATTORNEYS · M0ERSER4?RaI6E 1*40* · ·&bgr;

reduced, for example, to reduce energy costs for cooling the outside air, which is warmer than the room air.

Of course, it is also possible that the actuator of the closing device in the air inlet opening is connected to a measuring device for determining the air flow velocity, preferably to a measuring device measuring the air flow velocity in the air inlet opening, in order to compensate for the entry velocity of the air entering through the air inlet opening in order to actuate the closing device.

In another embodiment, the closing device can be designed as an automatically operating volume flow regulator. Such volume flow regulators only work with the duct energy and do not require a drive. If the volume flow flowing in the air duct reaches a previously set target value, for example, a flap designed as a closing device is pivoted more and more into the closed position against a spring force, so that the volume flow is thereby limited.

A device preventing air from flowing in the opposite direction to the intended direction, in particular a non-return valve, can expediently be provided in the air duct between the air inlet opening and the further air inlet opening.

In addition, a heat exchanger can be provided in the air duct between the air inlet opening and the other air inlet opening. This heat exchanger can be used, for example, to heat the air in a separate exhaust air duct.

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSETFSTRASSE Uo " b-47803 KREFELD

The heat is extracted from the exhaust air and passed on to the supply air flowing in the air duct.

The ventilation system can be designed as an underfloor or parapet device.

In the following, embodiments of the invention shown in the drawing are explained. They show:

Fig. 1 a section through an underfloor device,
Fig. 2 a section through a parapet device,

Fig. 3 a section through an underfloor device with a temperature measuring device,

Fig. 4 a section through an underfloor device with a measuring device for compensating the entry speed in the area of the air inlet opening,

Fig. 5 shows a further embodiment of the invention, wherein a closing device is provided in the air inlet opening,

Fig. 6 the article according to Fig. 5 with an additional closing device closing the further air inlet opening,

Fig. 7 shows the article according to Fig. 6 with a spring-loaded closing device closing the further air inlet opening,

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSET?STRAPSE YaO ** 5-478*03 KREFELD

Fig. 8 shows the article according to Fig. 6 with a weight-loaded closing device closing the further air inlet opening and

Fig. 9 shows the article according to Fig. 8 with a heat exchanger.

In all figures, identical reference symbols are used for identical or similar components.

Fig. 1 shows the use of the ventilation system according to the invention as an underground device that is sunk into a room floor 1 of a building not shown in detail. The room floor 1 is adjoined by a room wall 2 that is only partially shown.

The ventilation system itself consists of an air duct 3, which has a lateral air inlet opening 5 on the outside of the building, which protrudes through a recess 4 in the room wall 2, and at the opposite end an air outlet opening 7 directed upwards into the room 6 to be ventilated. The air outlet opening 7 is covered on the top with a grille 8 so that the ventilation system can also be accessed in this area. A heat exchanger 9 for tempering the air is installed upstream of the grille 8. An air conveying device 10 is provided upstream of the heat exchanger 9 in the direction of flow.

Between the air inlet opening 5 and the air conveying device 10, a further air inlet opening 11 is provided, which is also directed upwards into the room 6 and, in the embodiment shown, is arranged adjacent to the room wall 2. This further air inlet opening 11 also has a grille 12 on the top.

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSTOFFE Uo ** D-4780*3 KREFELD

The flow cross-section of the further air inlet opening 11 can be closed by means of a closing device designed as a flap 13. The flap 13 itself is mounted so that it can pivot in the direction of the arrow 14. For this purpose, a pivot axis 15 is provided in the area of the edges of the further air inlet opening 11 facing the air inlet opening 5 on the outside of the building, to which the flap 13 is pivotably attached.

In the position of the flap 13 shown in Fig. 1, when the air conveying device 10 is in operation, air is sucked in in the direction of arrow 16 via the air inlet opening 5 on the outside of the building. At the same time, room air is induced via the further air inlet opening 11 in the direction of arrow 17 and the outside air is transported together with the induced room air by means of the air conveying device 10 via the heat exchanger 9 in the direction of arrow 18 into the room to be ventilated.

If the flap 13 assumes a horizontal flap position, i.e. the flow cross-section of the further air inlet opening 11 is completely closed, only outside air is sucked in in the direction of the arrow 16 by means of the air conveying device 10.

When the flap 13 is in a vertical position, the air inlet opening 5 on the outside of the building is completely closed, so that pure recirculation is achieved. The flap 13 thus enables either the air inlet opening 5 or the other air inlet opening 11 to be completely closed. In an intermediate position of the flap 13, as shown in Fig. 1, for example, a corresponding ratio of

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSETf STftÄSSE 140 **b-47803 KREFELD

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Air sucked in through the air inlet opening 5 and the further air inlet opening 11.

In order to prevent, for example, the ingress of rainwater, a deflector plate 19 is provided which at least partially covers the air inlet opening 5 on the outside of the building. Of course, other designs of the deflector plate 19 are also conceivable.

Fig. 2 shows the use of the ventilation system according to the invention as a parapet device. In contrast to an underfloor device, the air duct 3 between the further air inlet opening 11 and the air conveyor device 10 is angled downwards so that the ventilation system can be installed in front of the room wall 2. Here too, the flap 13 designed as a closing device is arranged so that in the two end positions either the further air inlet opening 11 or the air inlet opening 5 on the outside of the building can be completely closed.

The flaps 13 in the embodiment shown in Fig. 1 and 2 can be manually adjustable, for example. However, it is also entirely possible for a servomotor 20 to act on the respective pivot axis 15 of the flap 13, so that the respective flap 13 can be adjusted electrically or pneumatically, for example. This is particularly useful for central control of various ventilation systems according to the invention.

In the embodiment of the ventilation system according to the invention shown in Fig. 3, the actuator 20 is connected to a temperature measuring device 21. This temperature measuring device 21 determines, for example, the internal temperature of the room to be ventilated. Depending on the

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DR. STARK & PARTNER PATENT ATTORNEYS · MOERSEtf STRAPSE 140 · D-47803 KREFELD

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In the case shown, a control device 22 sends a corresponding signal to the actuator 20 from the measured temperature, so that the position of the flap 13 corresponding to the signal can then be set. Such a temperature measuring device 21 is suitable, for example, for high outside temperatures and for lower desired room temperatures. In order to avoid unnecessarily high cooling outputs of the heat exchanger 9, the air flow sucked in via the air inlet opening 5 on the outside of the building is reduced by changing the position of the flap 13, so that the ventilation system is operated more and more in recirculation mode.

Fig. 4 shows a ventilation system according to the invention, in which a measuring device 23 is provided for determining an air flow speed, which in the embodiment shown is arranged in the air inlet opening 5 on the outside of the building. Such a measuring device 23 is suitable, for example, for compensating wind loads acting on a facade. The measuring device 23, which determines a pressure difference, for example, is connected to the servomotor 20 via the control device 22. If, for example, a high air flow speed is measured in the area of the air inlet opening 5 on the outside of the building, although the performance of the air conveyor device 10 has not been increased and the flap position is unchanged, this allows conclusions to be drawn about higher wind loads. In this case, the measuring device 23 sends a corresponding signal to the servomotor 20, so that the flow cross-section of the air inlet opening 5 on the outside of the building can be reduced by means of the flap 13.

DR. STARK & PARTNER PATENT ATTORNEYS ■ MOERSETTSTRASSE *140 " D-47803 KREFELD

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In the embodiment shown in Fig. 4, the ventilation system additionally has a temperature measuring device 22, so that the servo motor 20 can also be controlled depending on the temperature measured via the temperature measuring device 21.

In the embodiments shown in Figures 1 to 4, the air inlet opening 5 and the further air inlet opening 11 are arranged directly adjacent to and at an angle to one another, so that the flap 13 in its two end positions completely closes either the air inlet opening 5 or the further air inlet opening 11.

Figures 5 to 9 show embodiments of the invention in which the flow cross-section of the air inlet opening 5, which is preferably on the outside of the building, can be changed as desired using a separate closing device 24. The closing device 24 in the embodiments shown is an automatically operating volume flow regulator. This has a control flap 26 arranged on a shaft 25. Not shown is a spring acting on the control flap 26, e.g. a leaf spring, against which the control flap 26 can be pivoted from the open position shown into its closed position by the volume flow flowing in the direction of the arrow 16.

To dampen the control flap 26 as a result of sudden volume flow fluctuations within the air duct 3, a stationary holding element 27 is provided on the downstream side of the control flap 26, on which a bellows 28 is arranged. The bellows 28 has an inlet opening (not shown) which is provided in the area of the upstream side of the control flap 26.

DR. STARK & PARTNER PATENT ATTORNEYS ■ MOERSETt STRASSE 140 -"d-47803 KREFELD

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The volume flow controller designed as a closing device 24 is set to a desired setpoint so that the required and desired outside air rate is ensured by sucking in air in the direction of arrow 16. The setpoint of the volume flow controller designed as a closing device 24 can be set manually, for example. It is of course also possible for the setpoint of the volume flow controller to be motor-driven by suitable measures. This is particularly useful for the central control of several ventilation systems.

If a higher cooling or heating capacity is requested for room 6, the capacity of the air conveying device 10 is increased accordingly. Once the set target value is reached, the proportion of outside air remains constant, while the proportion of room air drawn in via the additional air inlet opening 11 increases. This is useful, for example, in the case of cooling, since then a higher proportion of outside air does not have to be cooled to below room temperature, but only the room air with the lower temperature compared to the outside air.

Furthermore, the closing device 24 designed as a volume flow controller limits an increased air flow due to wind loads acting on the outside of a facade, since only the outside air portion up to the set target value can flow into the air duct 3 via the air inlet opening 5.

In the embodiment shown in Fig. 5, a predetermined fixed resistance 29, e.g. in the form of a narrower cross-section or an adjustable flap, is provided in the area of the further air inlet opening 11, so that

DR. STARK & PARTNER PATENT ATTORNEYS · MOERSBRSTTSSSSE Y40 ***D-47803 KREFELD

with outside air can also be sucked in in the direction of arrow 16 via the air outlet opening 5.

In the embodiment shown in Fig. 6, the flow cross-section of the further air inlet opening 11 can be changed as desired with the flap 13, wherein the servo motor 20 acts on the pivot axis 15 of the flap 13.

Fig. 7 shows an embodiment in which a tension spring 30 engages the inflow side of the flap 13. As the proportion of outside air sucked in via the air inlet opening 5 increases, the flap 13 is pivoted against the tension spring 30 more and more in the direction of the arrow 31, so that room air can also be sucked into the air duct 3 via the further air inlet opening 11.

In the embodiment shown in Fig. 8, a weight 33 acts on the flap 13 via a lever arm 32, so that the flap 13 can be pivoted in the direction of the arrow 31 against the weight force resulting from the weight 33.

In order to prevent flow within the air duct 3 against the flow direction 16, a non-return flap 34 is provided in front of the further air inlet opening 11 as seen in the flow direction 16, which in the closed state rests against a stop 35 on the air duct side and thus prevents flow against the flow direction 16.

In the embodiment shown in Fig. 9, a heat exchanger 36 is provided in the air duct 3 between the non-return valve 34 and the further air inlet opening 11. This extracts heat from the air flowing in the direction of the arrow 37.

DR. STARK & PARTNER PATENT ATTORNEYS

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in an exhaust air duct 38 the heat is transferred to the supply air flowing in the direction of arrow 16. In order to ensure that the exhaust air flows in the exhaust air duct 38, a further air conveying device 39 is provided. The exhaust air duct 38 preferably passes through a recess (not shown) in the building's outer wall, so that the exhaust air can be transported directly to the outside in the direction of arrow 37.

Claims (14)

1. Ventilation system for room ventilation with an air duct ( 3 ) extending between an air inlet opening ( 5 ) preferably on the outside of the building and an air outlet opening ( 7 ) preferably on the inside of the room, wherein an air conveying device (10 ) and a further air inlet opening ( 11 ) for sucking in air located above the air duct ( 3 ), in particular room air, are provided in the air duct (3), characterized in that the further air inlet opening ( 11 ) is arranged on the intake side of the air conveying device ( 10 ) in the air duct ( 3 ). 2. Ventilation system according to claim 1, characterized in that the flow cross-section of the further air inlet opening ( 11 ) can be changed and/or closed by means of a closing device, in particular by means of a flap ( 13 ), in order to determine the air flow sucked in via the further air inlet opening ( 11 ). 3. Ventilation system according to claim 2, characterized in that the closing device can be actuated by means of an actuating element, in particular by means of an actuating motor ( 20 ). 4. Ventilation system according to claim 3, characterized in that the servomotor ( 20 ) for temperature-controlled actuation of the closing device is connected to a temperature measuring device ( 21 ), preferably to a temperature measuring device ( 21 ) measuring the room temperature. 5. Ventilation system according to claim 3 or 4, characterized in that the servomotor ( 20 ) for compensating the entry speed of the air entering through the air inlet opening ( 5 ) for actuating the closing device is connected to a measuring device for determining the air flow speed, preferably to a measuring device ( 23 ) measuring the air flow speed in the air inlet opening ( 5 ). 6. Ventilation system according to claim 2, characterized in that the closing device can be pivoted against a force, in particular against a weight or spring force ( 33 , 30 ), from its position closing the flow cross-section of the further air inlet opening ( 11 ) into the position releasing the flow cross-section of the further air inlet opening ( 11 ). 7. Ventilation system according to one of claims 1 to 6, characterized in that the flow cross section of the air inlet opening ( 5 ) can be changed and/or closed by means of a closing device ( 24 ), in particular by means of a flap, in order to determine the air flow sucked in via the air inlet opening ( 5 ). 8. Ventilation system according to claim 7, characterized in that the closing device ( 24 ) can be actuated by means of an actuating element, in particular by means of an actuating motor. 9. Ventilation system according to claim 8, characterized in that the actuator of the closing device ( 24 ) in the air inlet opening ( 5 ) is connected to a temperature measuring device ( 21 ), preferably to a temperature measuring device measuring the outside temperature, for temperature-controlled actuation of the closing device ( 24 ). 10. Ventilation system according to claim 7, characterized in that the closing device ( 24 ) is designed as an automatically operating regulator. 11. Ventilation system according to one of claims 1 to 10, characterized in that a device preventing a flow of air against the intended direction, in particular a non-return valve ( 34 ), is provided in the air duct ( 3 ) between the air inlet opening ( 5 ) and the further air inlet opening ( 11 ). 12. Ventilation system according to one of claims 1 to 11, characterized in that a heat exchanger is provided in the air duct ( 3 ) between the air inlet opening ( 5 ) and the further air inlet opening ( 11 ). 13. Ventilation system according to one of claims 1 to 12, characterized in that the ventilation system is designed as an underfloor device. 14. Ventilation system according to one of claims 1 to 13, characterized in that the ventilation system is designed as a parapet device.