DE102021114408A1 - heat exchanger and ventilation unit - Google Patents

Abstract

The invention relates to a regenerator heat exchanger (100) with an inner first end (100a) and an outer second end (100b) and a plurality of heat exchanger plates (110), each of which has a first and second plate end (100a, 11 0b) and have a sheet metal section (116) that is arched or curved in the radial direction. The heat exchanger plates (110) serve as a heat storage mass.

Description

The present invention relates to a heat exchanger and a ventilation device.

A ventilation device is used, for example, to aerate and/or ventilate a room. To increase efficiency, it is desirable to include heat recovery. This can be solved, for example, by providing a heat exchanger in the ventilation device. Heat recovery can thus be achieved by the heat exchanger.

UK 3037709 shows a device for heat recovery through an indirect, continuous or discontinuous heat exchange between two flowable media at different temperatures.

Regenerative heat exchangers are typically used in combination with fans for decentralized living space ventilation. Such heat exchangers typically consist of a plurality of plates stacked on top of one another. The advantages of such heat exchangers are, in particular, the low production costs.

It is an object of the present invention to provide an improved heat exchanger. It is in particular an object of the present invention to provide an improved heat exchanger for (room) ventilation devices.

This object is achieved by a regenerator heat exchanger according to claim 1 and by a ventilation device according to claim 7.

This object is achieved by a regenerator heat exchanger, which optionally has a circular or rectangular cross section with a center M. The heat exchanger has an inner first end and an outer second end as well as a plurality of heat exchanger plates, which each have a first and second plate end and a plate section that is arched or curved in the radial direction. The heat exchanger plates serve as a heat storage mass for regenerator operation. Due to the radial or curved configuration of the sheet metal section, the heat exchanger can be better adapted to an inflow or outflow with a twist. The heat exchanger plates extend in the axial direction and in cross section extend in the radial direction.

A regenerator is a heat exchanger with a short-term heat accumulator around which a warm and a cold medium, in this case air, flows alternately.

According to one aspect of the present invention, a regenerator heat exchanger for (room) ventilation devices is provided. The heat exchanger optionally has a round or circular cross-section. The heat exchanger consists of a number of heat exchanger plates. The heat exchanger plates each have a first and second end. The first ends of the heat exchanger laminations are coupled to each other in the region of the center (i.e. a first inner end) of the circular or annular cross-section of the heat exchanger. The second ends of the heat exchanger plates are coupled or plugged together at the second or outer end of the heat exchanger. The heat exchanger can thus be assembled or plugged together from a plurality of heat exchanger metal sheets. Optionally, the heat exchanger plates are identical. The heat exchanger plates serve as short-term heat accumulators, which are suitable for extracting and storing heat from a warm airflow flowing past and later transferring the stored heat to a cold airflow flowing past.

According to one aspect of the present invention, the heat exchanger sheets have a first end, an adjoining straight sheet section, a curved sheet section and a second straight sheet section. The first sheet metal section is slightly curved. The last sheet metal section is also straight. Adjacent heat exchanger plates are coupled to one another or plugged into one another by means of the first ends of the heat exchanger plates. The section at the second end of the heat exchanger plates is used to be coupled to other second ends of the heat exchanger plates or to be plugged into one another. The heat exchanger thus consists, both on its inside and on its outside, of a plurality of heat exchanger sheets, which are plugged into one another both on their inside and on their outside. A heat exchanger consisting of a plurality of metal sheets can thus be assembled or plugged together in a stable manner.

According to one aspect of the present invention, the heat exchanger sheets have recesses such as grooves along a longitudinal direction of the heat exchanger sheets. This is advantageous because it allows the heat exchanger capacity to be improved.

According to another aspect of the present invention, at the outer end is the heat exchanger plates provided a nose which can be inserted into a recess on an adjacent heat exchanger plate in particular in the region of the second end.

A heat exchanger sheet may have an elongate dimension or longitudinal extent (length) between the first and second ends. Perpendicular to the longitudinal dimension, the sheet metal has a width dimension (breadth).

The heat exchanger can be used, for example, in a one-room ventilation device. In this case, for example, at least one hole can be provided in a wall, with one heat exchanger and at least one fan being provided in each hole.

Due to the circular cross-section of the heat exchanger, it can be better used in a round hole in a wall that was subsequently added. For example, when operating the one-room ventilation, a fan can be operated in a first operating mode in order to force air out of the room to the outside. The metal sheets of the heat exchanger are heated by the air flowing out. A second operating mode of the fan can then be activated in order to transport air from outside to inside. This air then sweeps past the heat exchanger plates and can absorb the heat stored in the plates, so that this air is preheated before it enters the room.

In accordance with one aspect of the invention, the cross-section of the heat exchanger may be circular, oval, polygonal (e.g., 8-20 sided), or rectangular.

The heat exchanger according to the invention is particularly well adapted to a swirling inflow or outflow from a fan.

According to one aspect of the present invention, a first end or a first sheet metal section of the sheet metal can have a plurality of bends and/or stampings. A movement of the metal sheets relative to one another can thus be restricted when the first ends are coupled to one another. The second sheet metal section is provided in order to ensure a desired distance between the individual sheets with the smallest possible radius. The radius of the first section of the heat exchanger can thus be reduced. The third section has a bulge. This curvature can, for example, follow a logarithmic spiral in order to ensure the same distance between the individual sheets. The fourth sheet metal section can be made up of one or more bends and/or stampings. This area is used for attachment to adjacent metal sheets. A tab or plug may be inserted into a slot or opening in an adjacent panel so that the second end of the panel may be securely fastened in or to a second end of an adjacent panel.

According to one aspect of the present invention, the metal sheet has a length and a width and optionally at least partially longitudinal grooves.

The invention also relates to a (room) ventilation device L with at least one heat exchanger as described above.

The ventilation device has a cylindrical housing in which at least one fan (with a circular cross section) and at least one of the heat exchangers described above is provided. More than one fan can optionally be provided. The fan can optionally be operated in alternating mode.

Such ventilation devices can be used in particular as decentralized ventilation devices.

According to one aspect of the present invention, the laminations of the heat exchanger extend radially outward from a first inner end of the heat exchanger, with a portion of the laminations being arched or curved.

According to one aspect of the present invention, the arched sheet metal sections can be designed essentially parallel to one another.

According to an aspect of the present invention, a center line of a curvature of the sheet metal in the third sheet metal section follows a spiral, an Archimedean spiral or a logarithmic spiral.

According to a further aspect of the present invention, the distance between adjacent sheets is at least partially constant in the radial direction.

According to a further aspect of the present invention, the curvature of the third area is ≦180°.

With the first end of the metal sheets, a fixation between several slats can take place.

Furthermore, spacers can be provided to ensure the spacing between the slats.

According to one aspect of the present invention, the heat exchanger plates are made of coated steel or an aluminum alloy.

According to one aspect of the invention, a regenerator is used to temporarily store heat. In particular, this can be done in discontinuous operation (air in/air out, approx. every 40 seconds). A regenerator according to the invention represents a short-term heat accumulator for discontinuous operation, with the heat exchanger plates serving as a short-term heat accumulator.

The fan power of the fan can optionally be less than 200 W, and in particular less than 50 W.

With a volume flow of 100 m ² /h and in an interval of 40 seconds (change of air flow direction) there is heat storage or transfer to the heat exchanger of approx. 1.3 kJ/K in dry air and more in humid air.

This results in the following exemplary storage capacities: Sauna in Siberia outside temp.-40/ inside temperature. +100 gives a storage capacity of 171 KJ. For a residential building in winter, outside temperature -5 / inside temp +21 -> 32 kJ or outside temp -30 / inside temp + 30 -> 74 kJ. In other words, when the outside temperature is high and the inside temperature is low, the heat storage can work sufficiently well.

Further configurations of the invention are the subject matter of the dependent claims.

• 1 zeigt einen schematischen Querschnitt eines Wärmeübertragers gemäß einem ersten Ausführungsbeispiel,
• 2 zeigt eine perspektivische Ansicht eines Wärmeübertragers gemäß einem ersten Ausführungsbeispiel,
• 3 zeigt einen Querschnitt eines Wärmeübertrager-Bleches gemäß einem ersten Ausführungsbeispiel, und
• 4 zeigt eine perspektivische Ansicht des Wärmeübertrager-Bleches von 3,
• 5A zeigen verschiedene Ansichten eines Lüftungsgerätes gemäß einem bis 5E zweiten Ausführungsbeispiel,
• 6A zeigen verschiedene Ansichten eines Wärmeübertragers gemäß und 6B einem dritten Ausführungsbeispiel, und
• 7 zeigt eine schematische Schnittansicht eines Wärmeübertragers gemäß einem vierten Ausführungsbeispiel.

Advantages and exemplary embodiments of the invention are explained in more detail below with reference to the drawing.

• 1 shows a schematic cross section of a heat exchanger according to a first embodiment,
• 2 shows a perspective view of a heat exchanger according to a first embodiment,
• 3 shows a cross section of a heat exchanger plate according to a first embodiment, and
• 4 shows a perspective view of the heat exchanger plate from FIG 3 ,
• 5A show different views of a ventilation device according to a second embodiment to 5E,
• 6A show different views of a heat exchanger according to 6B and 6B a third embodiment, and
• 7 shows a schematic sectional view of a heat exchanger according to a fourth embodiment.

1 shows a schematic cross section of a heat exchanger according to a first embodiment. The heat exchanger 100 according to the first exemplary embodiment can be used in particular in a living space ventilation device which is installed later, with a circular bore being provided in the outer wall. The heat exchanger 100 according to the exemplary embodiment can be inserted at least partially into this circular bore. The heat exchanger 100 according to the first exemplary embodiment thus has an annular or circular cross section, so that it can then be placed in a corresponding bore in the outer wall. As an alternative to the circular hole, a rectangular hole can also be provided.

The heat exchanger 100 has a center point M and a plurality of heat exchanger plates 110 extending radially. The heat exchanger plates also extend in the axial direction. The heat exchanger has a first (radially) inner end 100a, first and second sections 100c, 100d and a (radially) outer (circular) end 100b. The heat exchanger 100 consists of a plurality of heat exchanger plates 110, which are coupled to one another or plugged into one another at their respective first and second ends 110a, 110b, so that both their first and their second ends 110a, 110b (fixed) to the first and second ends 110a, 110b of an adjacent heat exchanger plate 110 are connected. In this way it can be achieved that the heat exchanger 100 can be assembled or plugged together in a simple manner and has good stability by itself without further aids.

According to one aspect of the invention, the heat exchanger is designed as a regenerator heat exchanger. A regenerator is a heat exchanger with a short-term heat accumulator around which a warm and a cold medium, in this case air, flows alternately.

The respective heat exchanger plates 110 have a first and second end 110a, 110b. The first ends 110a of the heat exchanger plates 110 can be coupled to adjacent first ends 110a of adjacent heat exchanger plates 110 in the region of the first end 110a of the heat exchanger 100 . The second ends 110b of the heat exchanger plates 110 can in the region of the outer end 100b of the heat exchanger ragers 100 may be provided. The second ends 110b of the respective heat exchanger plates 110 are preferably coupled in adjacent heat exchanger plates 110 or plugged together with them.

The heat exchanger plates 110 thus have a first plate end 110a with a first plate section 114, a second plate section 115, a third plate section 116 and a fourth plate section 117, the fourth plate section being provided at the second end 110b of the heat exchanger plates 110. The second sheet metal section 115 is straight. The third sheet metal section 116 is curved or bent. The third sheet metal section 117 is also designed to be essentially straight.

The first sheet metal ends 110a that are plugged together or coupled can form the first (radially) inner end 100a of the heat exchanger 100 . The coupled second plate ends 110b of the plates 110 can form the second outer plate end 100b of the heat exchanger.

2 shows a perspective view of a heat exchanger according to a first embodiment. The heat exchanger 100 has a first and second end 110a, 110b. The heat exchanger 100 has a longitudinal or rotational axis 111 . The heat exchanger 100 according to 2 essentially corresponds to the heat exchanger 100 according to FIG 1 .

The heat exchanger 100 has a first section 100c adjacent to the first (radially) inner end 100a (with the second sheet metal sections 115) and a second section 100d between the second (radially) outer end 100b and the first section 100c. The third sheet metal sections 116 are provided in the area of the second section 110d.

3 shows a cross section of a heat exchanger plate according to a first embodiment. The heat exchanger plate 110 has a first and second end 110a, 110b. At the first end 110a, a first sheet metal section 114 is provided, which can have a curved configuration. A second sheet metal section 115 is then provided, which is designed to be essentially straight. Furthermore, a third sheet metal section 116 is provided, which is curved or bent. A fourth section 114 can be straight and can represent the second end 110 of the heat exchanger sheet 110 . The first and second ends 110a, 110b or the first and fourth sheet metal sections 114, 117 serve to be coupled to the first and fourth sheet metal sections of adjacent heat exchanger sheets 110. The configuration of the second sheet metal section 115 as a straight section can ensure that a sufficient distance is provided between the adjacent heat exchanger sheets 110 . The surface can be enlarged by the curved or round design of the third sheet metal section 110 .

4 shows a perspective view of the heat exchanger plate from FIG 3 . The heat exchanger plate 100 has a first and second end 110a, 110b. A first sheet metal section 114 is provided at the first end 110a and a fourth sheet metal section 117 is provided at the second end 110b. A second and a third sheet metal section 115, 116 are provided between the first and fourth sheet metal sections. The second sheet metal section 115 adjoins the first sheet metal section 114 . The third sheet metal section is provided between the second and fourth sheet metal sections 115, 117. The first sheet metal section 114 can be configured slightly bent outwards. The second sheet metal section 115 can be straight. The third sheet metal section 116 can be bent or arched. The fourth sheet metal section 117 can be straight.

Furthermore, the heat exchanger sheet metal 110 has a lug 111 in or on the fourth sheet metal section 117 . Furthermore, the metal sheet optionally has a plurality of grooves 113 between the first and second ends 110a, 110b. The grooves 113 may be continuous or discontinuous (i.e., there may be one or more grooves). Furthermore, a hole or an opening 112 can be provided in the area of the second end 110b.

Sheet 110 has a length 100f and a width 100e.

The opening 112 and the nose 111 are matched to one another, so that a nose 111 of a heat exchanger plate 110 can be inserted or coupled into an opening 112 of an adjacent heat exchanger plate 110, so that the second ends 110b of adjacent heat exchanger plates 110 into one another can be plugged in.

5A until 5E each show different views of a ventilation device according to a second embodiment. The ventilation device according to the second exemplary embodiment typically has a round or circular cross section and can be installed subsequently, for example. Ventilation of a room can be made possible by the ventilation device 200 according to the second exemplary embodiment. The ventilation device 200 has a housing 203 a first and second end 201,202. In 5A is shown an exploded view of the ventilation device according to the second embodiment. The ventilation device 200 accordingly has a housing 203 with a first and second end 201, 202. A fan 210 and at least one heat exchanger according to the first exemplary embodiment are placed in the housing. A cover 220 can optionally be provided, which is provided on the second end 202 . When the ventilation device is in operation, the fan 210 can be operated in pendulum mode, for example. This means that the fan first moves warm air from inside the room to the outside. The warm air from inside the room heats the metal sheets 110 of the heat exchanger 100. The direction of rotation of the fan 210 can then be changed so that cold air is conveyed from the outside into the inside of the room. The cold air brushes against the preheated metal sheets 110 of the heat exchanger 100, as a result of which the inflowing air is heated. The housing 203 can be designed in the form of a hollow cylinder. The sheets 110 can thus be used as regenerative heat exchangers.

5B shows a plan view of one end of the heat exchanger according to the first embodiment. The fan 210 with the fan blades 211 in particular can be seen here. At least one heat exchanger 100 with the metal sheets 110 according to the first exemplary embodiment is provided behind the fan.

5C shows a plan view of another end of the ventilation device 200. Here, in particular, the metal sheets 110 and behind them the fan 210 with the fan blades 211 are shown. A further heat exchanger 100 can be provided behind the fan.

Optionally, the inclination or curvature of the metal sheets 110 of a first heat exchanger can be oriented in a clockwise direction. A further heat exchanger 100 in the ventilation device 200 can have metal sheets 110 with a curvature which is aligned anti-clockwise.

5D shows a view of the air handling unit with a fan at one end of the air handling unit.

5E shows a perspective view of one end of the ventilation device 200 with a heat exchanger 100.

6A and 6B show different views of a heat exchanger according to a third embodiment. The heat exchanger 100 according to the third exemplary embodiment can be used in particular in a living space ventilation device. In this case, a circular bore can be provided in an outer wall, it being possible for the heat exchanger according to the third exemplary embodiment to be placed in such a bore. The heat exchanger 100 has a center point M and a plurality of heat exchanger laminations 110 which (in cross-section) extend radially. The heat exchanger plates 110 also extend in the axial direction. The heat exchanger plates 110 have a plate section 116 which is curved or bent. The sheet metal section 116 has a first and second end 116a, 116b. The first end 116a represents an inner end and the second end 116b represents an outer end. The first end 116a is located closer to a midpoint M of the heat exchanger.

7 shows a schematic sectional view of a heat exchanger according to a fourth embodiment. The heat exchanger 100 according to the fourth exemplary embodiment can be based on the heat exchanger 100 according to the third exemplary embodiment. In particular, the heat exchanger has a plurality of heat exchanger plates 110 which extend in the radial direction and have an arched or curved plate section 116 . The heat exchanger 100 is provided in a housing 200 which has a rectangular cross section. The cross section of the heat exchanger according to the fourth exemplary embodiment thus differs from the cross sections of the heat exchangers according to the first, second or third exemplary embodiment, which are each circular in shape. The heat exchanger can thus also be provided in a housing with a rectangular cross section.

According to one aspect of the present invention, the curved or arched sheet metal section 116 can optionally approximate the shape of a spiral: $$\mathrm{right}=a*\varphi .$$

Here, r corresponds to the radius and Φ to the circumferential angle. Optionally, the circumferential angle Φ is a maximum of 180°.

If the spiral is configured as a logarithmic spiral, then: $$\text{right}=\text{k}*\text{ex}\left(\text{a}*\text{t}\right)-\text{k}.$$

Here, r is the radius, Φ is the circumferential angle, and a and k are constants. Here, k can be between 20 and 400 and a can be between 0.3 and 3. With this formula, the distance between the heat exchanger plates can be adjusted will. The heat exchanger plates can thus be designed in such a way that the distance in the spiral course is constant or slightly increases or decreases in the outer or inner area.

Alternatively, the arched or curved sheet metal section 116 can also be formed by an arc of a circle with a radius of between 20 and 100 mm.

The minimum inner radius of the heat exchanger plates results from the number of plates multiplied by the thickness of the plates. The maximum inner radius should be a maximum of 10% larger than the minimum inner radius. The outer radius is optionally between 60 and 250 mm. The ratio of the outer radius to the inner radius can be between 1.5 and 30.

The ratio between the outer radius and the radius of section 115 is between 0.05 and 0.5.

In accordance with one aspect of the invention, the cross-section of the heat exchanger may be circular, oval, polygonal (e.g., 8-20 sided), or rectangular.

In the case of a heat exchanger with a polygonal cross-section (e.g. a 16-corner), sheets can be bent several times.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 3037709 [0003]

Claims (10)

Regenerator heat exchanger (100), with an inner first end (100a) and an outer second end (100b), and a plurality of heat exchanger plates (110), each of which has a first and a second plate end (110a, 110b) and a plate section (116) that is arched or curved in the radial direction, wherein the heat exchanger plates (110) serve as a heat storage mass. Heat exchanger (100) after claim 1 , wherein the heat exchanger plates (110) have a first plate section (114) as the first plate end (110a), a second plate section (115), a third arched or curved plate section (116) and a fourth plate section (117) between the first and second plate ends (110a, 110b), wherein the first plate ends (110a) of the plurality of heat exchanger plates (110) have a first inner end (100a) and the second plate ends (110b) of the plurality of heat exchangers - laminations (110) form a second outer end (100b). Heat exchanger (100) after claim 1 or 2 , wherein the second and fourth sheet metal section (115, 117) are configured straight. Heat exchanger (100) after claim 1 , 2 or 3 , wherein the first sheet metal section (114) has at least one bend or stamping, the first sheet metal section (114) being suitable for being coupled to first sheet metal sections (114) of adjacent heat exchanger sheets (110) in order to form a first inner end ( 110a) of the heat exchanger (100). Heat exchanger (100) according to one of Claims 1 until 4 , wherein the fourth sheet metal section (117) has a lug (111), an opening (112) being provided in the region of the second end (112b) of the sheet metal (110), a lug (111) of a sheet metal (110) turning into a Opening (112) of an adjacent sheet is inserted or coupled to couple the second ends (110b) of the adjacent sheets (110). Heat exchanger (100) according to one of Claims 1 until 5 , Longitudinal grooves (113) being provided in the area of the second and/or third sheet metal section (115, 116). Heat exchanger (100) according to one of Claims 1 until 6 , further with a circular, oval, rectangular or polygonal cross-section, a center (M). Ventilation device, with a housing (203), at least one fan (210) and at least one heat exchanger according to one of Claims 1 until 5 . ventilation device after claim 8 , wherein at least two heat exchangers (100) according to one of Claims 1 until 6 are provided in the housing (203), the curvature of the metal sheets (110) of a first heat exchanger (100) being opposite to the curvature of the metal sheets (110) of the second heat exchanger (100). ventilation device after claim 8 or 9 , wherein the housing (203) is designed as a hollow cylinder or has a rectangular cross section.

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