Heat exchanger

Abstract

The invention relates to a heat exchanger comprising a heat transfer body (1) that transfers heat between air and a fluid, has a fluid guide channel (1.1) for the fluid, and is manufactured using a layering process. According to the invention, the heat transfer body (1) has a plurality of air flow openings (1.2) for the air in regions free of fluid guide channels.

Description

[0001] The invention relates to a heat exchanger according to the preamble of patent claim 1.

[0002] A heat exchanger of the type mentioned above is known from patent document WO 2017 / 072423 A1. This heat exchanger consists of a heat transfer body that transfers heat between air and a fluid, has a fluid guide channel for the fluid, and is manufactured using a layering process. This heat exchanger serves in particular as an evaporator of a heat pump and essentially forms one of its outer walls (see Figures 9 to 11 in particular). In this solution, heat transfer occurs exclusively via heat conduction and natural convection, or in other words, the air is not conveyed by a fan.

[0003] The invention is based on the object of improving a heat exchanger of the type mentioned above. In particular, a heat exchanger with even better heat transfer is to be created.

[0004] This object is achieved with a heat exchanger of the type mentioned at the outset by the features listed in the characterising part of patent claim 1.

[0005] According to the invention, it is therefore provided that the heat transfer body has a plurality of air flow openings for the air in areas free of fluid guide channels.

[0006] In other words, the solution according to the invention is characterized in that the air can no longer only flow laterally along the heat transfer body, but in principle also through it, specifically at locations where no fluid guide channel is provided. Particularly preferably, the air is conveyed, in particular, with the aid of a fan or ventilator, thus enabling heat transfer through thermal conduction and forced convection.

[0007] Other advantageous developments of the heat exchanger according to the invention result from the dependent patent claims.

[0008] For the sake of completeness, reference is also made to patent document DE 10 2005 037 763 A1, which also shows a heat transfer body produced using a layering process. However, this body is not surrounded or traversed by air, but is coated with an adsorbent, the coating itself being designed to absorb and release steam.

[0009] The heat exchanger according to the invention, including its advantageous developments according to the dependent patent claims, is explained in more detail below with reference to the drawing of a preferred embodiment.

[0010] It shows Figure 1 shows a perspective view of a part of a heat exchanger according to the invention with three flat sections and two connecting sections; Figure 2 shows a perspective view of the heat exchanger according to the invention with a plurality of flat sections and connecting sections as well as a fan as an application example in a heat pump; Figure 3 shows a perspective view of the heat exchanger according to Figure 1 ; Figure 4 in front view the heat exchanger according to Figure 1 ; Figure 5 in side view the application example according to Figure 2 ; and Figure 6 in front view the application example according to Figure 2 and 5 .

[0011] The heat exchanger illustrated in the figures basically consists of a heat transfer body 1 that transfers heat between air and a fluid, has a fluid guide channel 1.1 for the fluid, and is manufactured using a layering process. The layering process in question particularly preferably refers to the so-called roll-bonding process (see also https: / / de.wikipedia.org / w / index.php?title=Roll-bonding&oldid=2330522 10). The material for the heat transfer body 1 is preferably metal, particularly preferably steel, in particular stainless steel, aluminum, or copper.

[0012] Looking at it in more detail, it is preferably provided that the heat transfer body 1 is formed from (at least) two pressed-together metal sheets, and the fluid guide channel 1.1 is arranged between these two metal sheets. The fluid guide channel 1.1 is created or manufactured by subsequent "blowing," with a separating agent being or having been provided in the region of the fluid guide channel 1.1 to prevent the metal sheets from joining together during rolling or pressing. Particularly preferred are further heat transfer bodies 1 pressed together from three metal sheets, with fluid guide channels 1.1 preferably being provided between a first and a second metal sheet, on the one hand, and between the second and a third metal sheet, on the other hand.

[0013] What is essential for the heat exchanger according to the invention is that the heat transfer body 1 has a plurality of air flow openings 1.2 for the air in areas free of fluid guide channels.

[0014] It is particularly preferred that the fluid is a refrigerant of a heat pump and / or the heat exchanger is a heat exchanger, in particular optionally an evaporator or condenser, of a heat pump. Furthermore, with reference to Figure 2 It is particularly preferred that a fan 2 conveying the air through the air flow openings 1.2 is assigned to the heat transfer body 1.

[0015] Looking at all this in more detail, it is particularly preferred that the heat transfer body 1 is formed from two flat, preferably planar, sections 1.10, 1.20 and a connecting section 1.30 arranged between them. The term "two" is to be interpreted in the sense of "at least two", with particular reference to Figure 2 It is even particularly preferred that the heat transfer body 1 be formed from a plurality (preferably at least ten) of flat sections 1.10, 1.20 and connecting sections 1.30 arranged therebetween. The above-mentioned requirement of a plurality of air flow openings 1.2 preferably means at least four air flow openings 1.2, and particularly preferably four air flow openings 1.2 per connecting section 1.30.

[0016] How particularly good Figure 1As can be seen, it is furthermore preferably provided that the two flat, preferably planar, sections 1.10, 1.20 are designed to run parallel to one another when the heat exchanger is ready for operation. In addition, the air flow openings 1.2 are preferably provided on the connecting section 1.30. Furthermore, it is preferably provided that the air flow openings 1.2 on a connecting section 1.30 have an area that corresponds to at least one-third of the area of ​​an adjacent section 1.20, 1.30. As is also clearly evident from Figure 1 As can be seen, it is further preferably provided that the connecting section 1.30 is curved.

[0017] In this context, and as in Figure 2As shown, it is preferably provided that the heat transfer body 1 is at least partially wave-shaped in cross-section. Furthermore, it can also be provided (not separately shown) that, in addition to wave-shaped sections in cross-section, there are also straight sections, and that a wave-shaped section is preferably followed by a straight section in cross-section.

[0018] With regard to the fluid guide channel 1.1, as can be seen from the figures, it is particularly preferred that the fluid guide channel 1.1 be designed to run in a meandering manner. Furthermore, to generate turbulence in the air, the fluid guide channel 1.1 is preferably designed to protrude from the flat sections 1.10, 1.20, preferably on both sides of the heat transfer body 1. Furthermore, it is particularly preferred that the fluid guide channel 1.1 be provided both on the two flat sections 1.10, 1.20 and on the connecting section 1.30, which is preferably web-shaped.

[0019] If, as is preferably provided, several fluid guide channels 1.1 are provided on the heat transfer body 1, it is further preferably provided (but not separately shown) that (also) a distribution and / or collection device (also called a capillary spider - see for example also EP 2 859 296 B1, Figure 13) fluidically connected to the fluid guide channels 1.1 is provided between the sheets of the heat transfer body 1 in order to be able to distribute the fluid accordingly to the fluid guide channels 1.1 or to collect it from them.

[0020] Finally, the following method with the following steps is provided for the production of the heat exchanger according to the invention: 1. The layers for the heat transfer body 1 are cut out of a flat material; 2. the air flow openings 1.2 are introduced into the flat layers; 3. the layers are provided with a separating agent in the area of ​​the fluid guide channel 1.1 to be created; 4. at least two layers are pressure-joined together; 5. the fluid guide channel 1.1 is created by inflating the layers in the area of ​​the applied separating agent; and 6. the heat transfer body 1 is bent in the area of ​​the air flow openings 1.2. List of reference symbols

[0021] 1 Heat transfer body 1.1 Fluid guide channel 1.2 Air flow openings 1.10 Section 1.20 Section 1.30 Connecting section 2 Fan

Claims

1. Heat exchanger, comprising a heat transfer body (1) which transfers heat between air and a fluid, has a fluid guide channel (1.1) for the fluid and is manufactured in a layer process, characterized by that the heat transfer body (1) has a plurality of air flow openings (1.2) for the air in areas free of fluid guide channels.

2. Heat exchanger according to claim 1, characterized by that the heat transfer body (1) is formed from two flat sections (1.10, 1.20) and a connecting section (1.30) arranged therebetween.

3. Heat exchanger according to claim 2, characterized by that the two flat sections (1.10, 1.20) are designed to run parallel to each other.

4. Heat exchanger according to claim 2 or 3, characterized by that the air flow openings (1.2) are provided on the connecting section (1.30).

5. Heat exchanger according to one of claims 2 to 4, characterized by that the connecting section (1.30) is curved.

6. Heat exchanger according to one of claims 2 to 5, characterized by that the fluid guide channel (1.1) is provided both on the two flat sections (1.10, 1.20) and on the connecting section (1.30).

7. Heat exchanger according to one of claims 1 to 6, characterized by that the fluid guide channel (1.1) is designed to run in a meandering manner.

8. Heat exchanger according to one of claims 1 to 7, characterized by that the heat transfer body (1) is formed from two pressed-together sheets and the fluid guide channel (1.1) is arranged between these two sheets.

9. Heat exchanger according to one of claims 1 to 8, characterized by thata fan (2) which conveys the air through the air flow openings (1.2) is assigned to the heat transfer body (1).

10. Heat exchanger according to one of claims 1 to 9, characterized by that a plurality of air flow openings (1.2) means at least four air flow openings.

11. Heat exchanger according to one of claims 1 to 10, characterized by that the heat exchanger is a heat exchanger of a heat pump.

12. Heat exchanger according to one of claims 1 to 11, characterized by that the heat transfer body (1) is at least partially wave-shaped in cross-section.

13. Heat exchanger according to one of claims 8 to 12, characterized by that a distribution and / or collection device fluidically connected to a plurality of fluid guide channels (1.1) is provided between the sheets of the heat transfer body (1).

14. A method for producing a heat exchanger according to one of claims 1 to 13, characterized by that the layers for the heat transfer body (1) are cut out of a flat material, that the air flow openings (1.2) are introduced into the flat layers, that the layers in the area of the fluid guide channel (1.1) to be created are provided with a separating agent, so that at least two layers are pressure-joined together, that the fluid guide channel (1.1) is created by inflating the layers in the area of the applied release agent, and that the heat transfer body (1) is bent in the area of the air flow openings (1.2).

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