DE102023133907A1 - heat exchanger - Google Patents

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

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

A heat exchanger of the type mentioned above is known from the 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 in a layered process. This heat exchanger serves in particular as an evaporator of a heat pump and essentially forms one of its outer walls (see there in particular the 9 to 11 ). With this solution, heat transfer occurs exclusively through conduction and natural convection, or in other words, the air is not moved by a fan.

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.

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.

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.

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.

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

For the sake of completeness, reference is made to the patent document DE 10 2005 037 763 A1 which also shows a heat transfer body produced in a layer process, but this is not surrounded or flowed through by air, but rather is coated with an adsorbent, whereby the coating itself is designed to absorb and release steam.

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.

• 1 perspektivisch einen Teil eines erfindungsgemäßen Wärmeübertragers mit drei flächigen Abschnitten und zwei Verbindungsabschnitten;
• 2 perspektivisch als Anwendungsbeispiel in einer Wärmepumpe den erfindungsgemäße Wärmeübertrager mit einer Vielzahl von flächigen Abschnitten und Verbindungsabschnitten sowie einem Ventilator;
• 3 perspektivisch den in eine Ebene ausgebreiteten Wärmeübertrager gemäß 1;
• 4 in Vorderansicht den Wärmeübertrager gemäß 1;
• 5 in Seitenansicht das Anwendungsbeispiel gemäß 2; und
• 6 in Vorderansicht das Anwendungsbeispiel gemäß 2 und 5.

It shows

• 1 perspective view of a part of a heat exchanger according to the invention with three flat sections and two connecting sections;
• 2 perspective view of the heat exchanger according to the invention as an application example in a heat pump, with a plurality of flat sections and connecting sections as well as a fan;
• 3 perspective view of the heat exchanger spread out in one plane according to 1 ;
• 4 in front view the heat exchanger according to 1 ;
• 5 in side view the application example according to 2 ; and
• 6 in front view the application example according to 2 and 5 .

The heat exchanger shown in the figures basically consists of 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 layering process. The layering process in question is particularly preferably understood to mean the so-called roll-bond 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.

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," wherein a separating agent is or was provided in the area of the fluid guide channel 1.1 so that the metal sheets in the area of the channel cannot bond together during rolling or pressing. Particularly preferably, heat transfer bodies pressed from three metal sheets are also provided. supply body 1, wherein in this case fluid guide channels 1.1 are preferably provided on the one hand between a first and a second sheet and on the other hand between the second and a third sheet.

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.

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 2 It is particularly preferred that the heat transfer body 1 is assigned a fan 2 which conveys the air through the air flow openings 1.2.

Looking at it 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 therebetween. The term "two" is to be interpreted in the sense of "at least two", with particular reference to 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.

How particularly good 1 As 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 1 As can be seen, it is further preferably provided that the connecting section 1.30 is curved.

In this context, and as in 2 As 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.

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.

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 fluidically connected to the fluid guide channels 1.1 (also called capillary spider - see for example also EP 2 859 296 B1 , 13 ) is provided between the sheets of the heat transfer body 1 in order to be able to distribute the fluid to the fluid guide channels 1.1 or to collect it from them.

1. 1. Die Schichten für den Wärmeübertragungskörper 1 werden aus einem ebenflächigen Material ausgeschnitten;
2. 2. die Luftdurchströmöffnungen 1.2 werden in die ebenflächigen Schichten eingebracht;
3. 3. die Schichten werden im Bereich des zu erzeugenden Fluidführungskanal 1.1 mit einem Trennmittel versehen;
4. 4. mindestens zwei Schichten werden miteinander druckgefügt;
5. 5. der Fluidführungskanal 1.1 wird durch Aufblasen der Schichten im Bereich des aufgebrachten Trennmittels erzeugt; und
6. 6. der Wärmeübertragungskörper 1 wird im Bereich der Luftdurchströmöffnungen 1.2 gebogen.

Finally, the following method with the following steps is provided for the production of the heat exchanger according to the invention:

1. 1. The layers for the heat transfer body 1 are cut out of a flat material;
2. 2. the air flow openings 1.2 are introduced into the flat layers;
3. 3. the layers are provided with a release agent in the area of the fluid guide channel 1.1 to be created;
4. 4. at least two layers are pressure-bonded together;
5. 5. the fluid guide channel 1.1 is created by inflating the layers in the area of the applied release agent; and
6. 6. the heat transfer body 1 is bent in the area of the air flow openings 1.2.

List of reference symbols

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

QUOTES CONTAINED IN THE DESCRIPTION

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

Cited patent literature

• WO 2017/072423 A1 [0002]
• DE 10 2005 037 763 A1 [0008]
• EP 2 859 296 B1 [0019]

Cited non-patent literature

• https://de.wikipedia.org/w/index.php?title=Roll-bonding&oldid=2330522 10 [0011]

Claims (14)

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 produced in a layering process, characterized in that the heat transfer body (1) has a plurality of air flow openings (1.2) for the air in regions free of fluid guide channels. Heat exchanger according to Claim 1 , characterized in that the heat transfer body (1) is formed from two flat sections (1.10, 1.20) and a connecting section (1.30) arranged therebetween. Heat exchanger according to Claim 2 , characterized in that the two flat sections (1.10, 1.20) are designed to run parallel to one another. Heat exchanger according to Claim 2 or 3 , characterized in that the air flow openings (1.2) are provided on the connecting section (1.30). Heat exchanger according to one of the Claims 2 until 4 , characterized in that the connecting section (1.30) is curved. Heat exchanger according to one of the Claims 2 until 5 , characterized in 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). Heat exchanger according to one of the Claims 1 until 6 , characterized in that the fluid guide channel (1.1) is designed to run in a meandering manner. Heat exchanger according to one of the Claims 1 until 7 , characterized in 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. Heat exchanger according to one of the Claims 1 until 8 , characterized in that the heat transfer body (1) is assigned a fan (2) which conveys the air through the air flow openings (1.2). Heat exchanger according to one of the Claims 1 until 9 , characterized in that a plurality of air flow openings (1.2) means at least four air flow openings. Heat exchanger according to one of the Claims 1 until 10 , characterized in that the heat exchanger is a heat exchanger of a heat pump. Heat exchanger according to one of the Claims 1 until 11 , characterized in that the heat transfer body (1) is at least partially wave-shaped in cross section. Heat exchanger according to one of the Claims 8 until 12 , characterized in 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). Method for producing a heat exchanger according to one of the Claims 1 until 13 , characterized in 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 are provided with a separating agent in the region of the fluid guide channel (1.1) to be created, that at least two layers are pressure-joined to one another, that the fluid guide channel (1.1) is created by inflating the layers in the region of the applied separating agent, and that the heat transfer body (1) is bent in the region of the air flow openings (1.2).

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