DE102015218445A1 - Heat exchanger with MPE component and two media flow labyrinths as well as household refrigeration unit - Google Patents

Abstract

The invention relates to a heat exchanger (18) for a refrigeration cycle of a household refrigerating appliance (1), which has a thermal coupling unit (19), with which a thermal energy exchange between media can be carried out, and which is designed as an MPE component, wherein the MPE component integrated with a first flow labyrinth (21) for a first medium, and having a second flow labyrinth (26) for a second medium, which with labyrinth sections (27, 28, 29) directly to labyrinth sections (22, 23, 24) of the first 21), and the labyrinth sections (22, 23, 24, 27, 28, 29) are arranged so that in a direction of extension of the MPE component, a plurality of labyrinth sections (22, 23, 24) of the first flow labyrinth (FIG. 21) are arranged alternately to a plurality of labyrinth sections (27, 28, 29) of the second flow labyrinth (26). The invention also relates to a household refrigerator (1).

Description

The invention generally relates to a heat exchanger. The invention also relates to a household refrigerator with such a heat exchanger.

A no-frost household refrigerator is equipped with a no-frost technology. As a no-frost technique, a technical process is referred to, in which the humidity is reduced in a designed as a freezer compartment interior. As a result, the food does not frost or significantly reduced and a defrosting of the freezer compartment can be omitted or only needs to be carried out in significantly reduced time cycles. In such a no-frost technique, for example, cooling elements designed as cooling fins, and thus a heat exchanger of the refrigeration cycle, lie in a separated area in the interior space. During the cooling phase, the cold air is then introduced from this separated area in the interior and thus the freezer compartment by a fan. These devices are designed so that air circulates through all compartments of the interior and enters the cycle again in the separated area. Since cold air holds less moisture, it precipitates as frost primarily only to the heat exchanger of the refrigeration cycle, which is located in the separated area. It may then be provided that a defrost mode is performed at specific time intervals, in which this first heat exchanger is defrosted in the separated area. For this purpose, in particular a heating device is provided in the no-frost domestic refrigeration appliance, by which a heating of this heat exchanger is performed. The then thawing ice layer and the resulting water can run out of the interior and thus also from the device via a gutter and can be collected in a collecting bowl, which can also serve as an evaporation tank. In particular, the fan is deactivated in the defrost mode, so that the freezer compartment remains cooled. Thanks to the no-frost technology, the freezing of cooling fins is significantly reduced and the humidity in the entire domestic refrigeration unit drops, which also significantly reduces the formation of ice layers.

A no-frost household refrigeration appliance is for example from the DE 10 2010 041 952 A1 known.

In a no-frost household refrigeration appliance, in which a physical cold storage, in particular as a container, is present, in which a storage medium is contained, this cold storage is cooled by means of the primary refrigeration cycle. The already mentioned secondary refrigeration cycle, which is a brine circuit (refrigeration oil circuit), usually has a pump, through which the "cold" is conveyed to the no-frost unit and thus in particular in the first heat exchanger.

From the GB 2 057 109 A is a refrigerator with a primary refrigeration cycle, a secondary refrigeration cycle and a cold storage, with which the two refrigeration circuits are thermally coupled, shown.

Furthermore, from the DE 10 2011 079 208 A1 a no-frost household refrigeration appliance is known. From this document, a method for defrosting an evaporator and thus also a heat exchanger is known.

In the known embodiments, in which the primary refrigeration cycle is thermally coupled to the secondary refrigeration cycle, in particular in the region of cold storage, primarily the existing pipe loops of each thermally coupled heat exchanger of the primary refrigeration cycle and the secondary refrigeration cycle are connected by solder joints. However, the thermal coupling of the media flowing in the pipes, in particular refrigerant, is very dependent on the solder joint. These solder joints are usually produced only with great effort in sufficiently good quality.

It is also known that a heat exchanger with a multiport extrusion profile (MPE profile) is formed. By such embodiments, the efficiency of the thermal coupling can be significantly improved.

From the WO 2014/133394 A1 For example, such a heat exchanger having a multiport extrusion profile is known. This heat exchanger can also be arranged for example in a freezer. In this known heat exchanger, it is provided that the mutually spaced channels are each connected by thin webs or plate-like strips.

In this known heat exchanger with an MPE profile only the respective channels are formed and it can be passed through such a plate-like part only one medium.

It is an object of the present invention to provide a heat exchanger in which an existing MPE component of a thermal coupling unit is designed to be more multifunctional.

This object is achieved by a heat exchanger and a household refrigerator according to the independent claims.

An inventive heat exchanger is in particular for a refrigeration cycle of a Household refrigeration device trained. The heat exchanger comprises a thermal coupling unit, with which a thermal energy exchange between media is feasible. The thermal coupling unit is designed as an MPE component and thus as a multiport extrusion component. An essential idea of the invention is that the MPE component integrally has a first flow labyrinth for a first medium which can flow through the flow labyrinth. In addition, the MPE component likewise has an integrated second flow labyrinth which is fluidly separated or separated from the first flow labyrinth and which is designed to flow through a second medium. The first flow labyrinth directly adjoins labyrinth sections of the second flow labyrinth with labyrinth sections. The respective labyrinth sections are arranged such that in a direction of the MPE device, a plurality of labyrinth sections of the first flow labyrinth are arranged alternately to a plurality of labyrinth sections of the second flow labyrinth. Alternating here can be an alternating arrangement of in each case one labyrinth section of the respective flow labyrinths. However, it may also be, for example, an order with a labyrinth portion of a first flow labyrinth and then following, for example, two labyrinth sections of the other second flow labyrinth and then again following a labyrinth section of the first flow labyrinth, in particular, etc. formed. By this embodiment, a heat exchanger is provided, which is designed as at least two-media heat exchanger and the thermal coupling is maximized. This is because the separated media are formed by the specific arrangement of the labyrinth sections next possible and over a maximum length to each other. Thus, two separate media can flow in this heat exchanger, so that two separate refrigeration circuits can be thermally coupled with this one heat exchanger. This one heat exchanger with a thermal coupling unit is thus both part of a refrigeration cycle and at the same time part of the other refrigeration cycle.

For this purpose, according to the invention, the design of the thermal coupling unit is specified and the particular one-piece MPE component has integrally both flow labyrinths, in which the respective media can move separately. By such a configuration, the efficiency of the thermal coupling is significantly improved and it can now be provided with a much higher efficiency with respect to its thermal energy transfer property even with such MPE component a mehrfluidiges or one equipped with multiple media of different refrigeration circuits heat exchanger. For this purpose, it is also provided according to the invention that the labyrinth sections of the flow labyrinths are arranged in a very specific manner to each other, namely are positioned alternately to each other. This makes it possible to realize an extremely compact design of this specific thermal coupling unit and to make the thermal energy transmission even more efficient.

In particular, it is provided that the first flow labyrinth has at least one collecting chamber for the first medium, which can flow in the first flow labyrinth. Such a collection chamber then also allows a circumferential recording of the medium in direct connection to the labyrinth sections, so that also always fast and sufficient medium for the labyrinth sections is provided, so that in turn in this regard, the efficiency of the thermal energy transfer is improved. In addition, a medium not required in the labyrinth sections can be collected or stored in the MPE component itself and is then also available as needed in the immediate vicinity of the labyrinth sections. The labyrinth sections of the first flow labyrinth then open in the MPE component directly into this collection chamber. In particular, at least one collecting chamber and at least one distribution chamber is provided. The distributor chamber, also referred to as header, is designed for a uniform distribution of the medium. In particular, two collection chambers and two distribution chambers are formed at both ends of the MPE component, the respective labyrinth sections opening into the chambers.

The same can also be provided with at least one second collecting chamber, which is connected to the second flow labyrinth.

Preferably, the collection chambers are formed at opposite ends of the MPE component. In particular, the MPE component is formed symmetrically. As a result, a uniform weight distribution can be created so that the heat exchanger and in particular the thermal coupling unit is not weighted on one side. The assembly and the mechanically stable bracket are favored. In addition, a fluidic advantage can be achieved precisely by this embodiment in conjunction with the cascaded or alternately arranged labyrinth sections. For both the introduction of the respective media from the collection chambers in the labyrinth sections and the collection of the respective medium from the respective labyrinth sections in the collection chambers is then simplifies and favors the thermal energy transfer.

In particular, labyrinth sections and thus the MPE sections of the MPE component of the first flow labyrinth are arranged in a straight line and parallel to one another. Under a labyrinth thus also embodiments are understood in which the labyrinth sections are not curved. Additionally or instead, it can be provided that labyrinth sections thus the MPE sections of the MPE component of the second flow labyrinth are rectilinear and are arranged parallel to each other.

It can also be provided that labyrinth sections of the first flow labyrinth are arranged in meandering fashion and / or labyrinth sections of the second flow labyrinth are arranged meandering. It can then the needs of the respective structural configurations of the heat exchanger and its structural limitations, especially in a household refrigeration appliance diverse individually taken into account. In particular, depending on the situation, a respective individual length of the heat exchanger can then be made available.

It can also be provided that labyrinth sections of the first flow labyrinth are arranged spirally and / or labyrinth sections of the second flow labyrinth are arranged spirally. Also in this context, the above-mentioned advantages apply to these specific geometries of the labyrinth sections, which can then be given priority in each individual type of installation.

It is preferably provided that cross sections of the labyrinth sections of the MPE component are formed as a function of the flowing media provided by the flow labyrinths. Since there are different media, especially refrigerants, this degree of thermal energy transfer can be improved even further by this configuration. Depending on the particular composition of a medium or both media, the wall thicknesses of the labyrinth sections can then be formed individually, so that the best possible thermal energy transfer is achieved for the material pairing of the media on the one hand and the material of the MPE component on the other hand, in particular on the walls.

It is preferably provided that the thermal coupling unit made of metal, in particular aluminum, is designed as MPE component.

It can be provided that an outer side of the MPE component is formed from a corrosion-resistant material. This is a very advantageous embodiment, especially when the heat exchanger is arranged for the thermal coupling of two separate refrigeration circuits, in particular in a domestic refrigerator and beyond is arranged in direct contact with a surrounding the heat exchanger storage medium in a cold storage of this household refrigeration appliance. Since such a storage medium can be, for example, a saline solution, such a configuration with a corrosion-resistant material is especially advantageous. A longevity with unrestricted functionality of the heat exchanger is achieved.

It is preferably provided that the outside is provided with a corrosion-resistant coating. As a result, regardless of the material composition of the MPE component, which is preferably aluminum, a need-based and the respective situation adapted corrosion protection layer can be applied. This can then be designed individually with regard to the area of use of this heat exchanger and in particular the storage medium, with which the outside of the heat exchanger comes into contact, with regard to the layer thickness and / or on the material composition of this coating.

It can also be provided that a heat exchanger device is formed, which is constructed from at least two heat exchangers according to the invention or an advantageous embodiment thereof.

Furthermore, the invention also relates to a household refrigerator with a heat exchanger according to the invention or an advantageous embodiment thereof.

Preferably, the household refrigerator is a no-frost household refrigeration appliance. This has a housing in which an interior for receiving food is formed. The no-frost domestic refrigeration appliance comprises a primary refrigeration cycle, which is thermally coupled to a heat exchanger unit with a cold storage of the no-frost household refrigeration appliance. The no-frost household refrigeration appliance further comprises a secondary refrigeration cycle, which is also thermally coupled to a further heat exchanger unit with the cold storage and is designed to cool the interior and is coupled thereto to the interior. These two heat exchanger units of the two refrigeration circuits are formed by the heat exchanger according to the invention or an advantageous embodiment.

The heat exchanger is arranged in the cold storage and surrounded by a storage medium contained in the cold storage.

In such an embodiment, the heat exchanger according to the invention or an advantageous embodiment thereof is then a three-media heat exchanger. There are two media, in particular refrigerant, thermally coupled - through the labyrinth sections of the MPE component - the one that is present in the primary circuit and the other, which is present in the secondary circuit. This can also be done via the third medium, namely the storage medium. The two media flowing in the labyrinth sections of the heat exchanger are conducted in cocurrent or countercurrent flow. Due to the arrangement of the labyrinth sections, these two media are passed in alternating sequence through the channels or labyrinth sections.

The aforementioned collection chambers can each be fed via a central connection with one of the two media. Also a two-sided loading of the distribution chambers is possible and advantageous for a uniform distribution of the media. Due to the design of the coupling unit made of a material with high thermal conductivity, such as aluminum, the thermal resistance between the media is kept low. In the secondary refrigeration cycle, in particular, a feed pump is connected in order to circulate the medium located in the secondary refrigeration cycle. It may also be provided a so-called natural circulation without a pump. The storage medium of the cold accumulator is coupled to a designed as an evaporator heat exchanger of the primary refrigeration circuit, which is in particular a flow labyrinth of the MPE component. If the pump of the secondary refrigeration cycle is switched off and the primary refrigeration cycle is in operation, the storage medium of the cold storage is cooled by the evaporator of the primary refrigeration cycle. If this feed pump is switched on, the "cold" is transported away from the evaporator of the primary refrigeration cycle via the secondary refrigeration cycle. If the primary refrigeration cycle and thus its evaporator switched off, the "cold" is removed from the storage medium of the cold storage on the secondary refrigeration cycle with the pump of the secondary refrigeration cycle.

By a suitable choice of geometry of the labyrinth sections, for example meandering or spiral, the distance for the heat transfer in the storage medium of the cold storage can be kept as small as possible. As a result, a fast loading and unloading of the usually poor heat-conducting storage medium is possible, whereby the duration and thus the energy consumption of the primary refrigeration cycle and also the secondary refrigeration cycle - since a good transfer of the "cold" from the storage medium is achieved in the secondary refrigeration cycle - is reduced.

It can also be provided that more than two refrigerant circuits of a device are coupled, for example a refrigerant circuit and two separate (sensitive) circuits for a refrigerating compartment and a freezer compartment of a household refrigerator.

Preferably, the MPE component is formed as an extruded semi-finished product.

The terms "top", "bottom", "front", "rear", "horizontal", "vertical", "depth direction", "width direction", "height direction" are the intended use and intended arrangement of the device and a then given in front of the device and given in the direction of the device observer given positions and orientations.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and feature combinations mentioned above in the description, as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respectively specified combination but also in other combinations or in isolation, without the frame to leave the invention. Thus, embodiments of the invention are to be regarded as encompassed and disclosed, which are not explicitly shown and explained in the figures, however, emerge and can be produced by separated combinations of features from the embodiments explained. Embodiments and combinations of features are also to be regarded as disclosed, which thus do not have all the features of an originally formulated independent claim.

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

1 a schematic perspective view of an embodiment of a household refrigerator according to the invention;

2 a schematic representation of an embodiment of a refrigeration cycle of the household refrigerating appliance according to 1 ; and

3 a schematic perspective and partially transparent embodiment of an embodiment of a heat exchanger according to the invention.

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In 1 is a schematic representation of a household refrigerator 1 shown which is a no-frost household refrigerator. The household refrigerator 1 includes an inner container 2 passing through walls a first interior 3 which is a freezer compartment and a second interior 4 which is a refrigerator, limited. The interior 3 is from the interior 4 separated. The interior 3 is through a door 5 can be closed at the front. Independent of this is a door 6 designed to close the interior 4 is trained.

The interior 3 For example, it is used for freezing foods. Also in the interior 4 Food can be introduced, however, compared to the interior 3 at higher temperatures, especially at temperatures greater than 0 ° C.

The inner container 2 is in a housing 7 of the household refrigerator 1 arranged.

In 2 is a simplified schematic representation of a refrigeration cycle of the household refrigerator 1 shown. The refrigeration cycle includes in the example shown a primary refrigeration cycle 8th which is a self-contained refrigeration cycle. The primary refrigeration cycle 8th is a compressor refrigeration cycle. The primary refrigeration cycle 8th includes a first heat exchanger unit 9 which forms an evaporator. In addition, the household refrigerator includes 1 one from the primary refrigeration cycle 8th separate secondary refrigeration circuit 10 , The secondary refrigeration cycle 10 is thermal with the primary refrigeration cycle 8th coupled. In a cold storage 11 that includes a container is the primary refrigeration cycle 8th and the secondary refrigeration cycle 10 to the storage medium 12 coupled.

The secondary refrigeration cycle 10 also includes a first heat exchanger 13 that transmits cold and thermally with the interior 3 and also the interior 4 is coupled. This is an area 14 formed in the first heat exchanger 13 is arranged and through a partition wall 15 from the rest of the interior 3 and the interior 4 is separated. In the partition 15 openings are provided through which by means of a fan 16 cold air from the area 14 in the remaining interior 3 and the interior 4 is promoted and more openings in the partition 15 Air from the interior 3 and the interior 4 turn into the area 14 arrives.

The secondary refrigeration cycle 10 also includes a feed pump 17 , by means of which in the secondary refrigeration cycle 10 existing refrigerant is circulated. The secondary refrigeration cycle 10 also includes a heat exchanger unit 20 connected to the heat exchanger unit 9 of the primary refrigeration cycle 8th thermally coupled.

The two heat exchanger units 9 and 20 are as a single heat exchanger 18 educated. This heat exchanger 18 includes a thermal coupling unit 19 , as shown in simplified perspective in 3 is shown. The representation in 3 is only to be understood schematically and also partially shows a broken or transparent state of the thermal coupling unit 19 , The thermal coupling unit 19 is integrally formed as MPE component and formed in particular of aluminum.

This MPE component integrally has a first flow labyrinth 21 with exemplary labyrinth sections 22 . 23 and 24 on. In this first flow labyrinth 21 flows a first medium or refrigerant, which is the medium of the primary refrigeration cycle 8th is. The first flow labyrinth 21 also includes at least one collection chamber 25 , which is designed integrated in this MPE component.

In addition, a second flow labyrinth is integrated in this MPE component 26 formed, which labyrinth sections 27 . 28 and 29 includes. In addition, the second flow labyrinth includes 26 at least one collection chamber 30 , In the collection chamber 30 and in the labyrinth sections 27 to 29 flows another medium or refrigerant, which is the refrigerant of the secondary refrigeration cycle 10 is. The two flow labyrinths 21 and 26 are fluidically decoupled from each other so that the media does not come into direct contact with each other. As in the example in 3 is shown schematically, the labyrinth sections are formed as rectilinear elements which are also arranged parallel to each other. In addition, it is envisaged that the labyrinth sections 21 to 24 in an extension direction of the coupling unit 19 , here in the x-direction, which represents the width direction, are arranged alternately to each other. This means that in this x-direction each on a labyrinth section 22 . 23 . 24 of the first flow labyrinth 21 a labyrinth section 27 . 28 . 29 of the second flow labyrinth 26 is arranged following. The labyrinth sections 22 to 24 such as 27 to 29 may also have other courses, for example meandering or spiral. However, it may also be provided that in addition to these rectilinear labyrinth sections 22 to 24 such as 27 to 29 each additional labyrinth sections are provided, which are then meandering or spiral.

In addition, it is envisaged that this at least two-media heat exchanger 18 , in particular the three-media heat exchanger 18 , on an outside 31 that are in contact with the storage medium 12 passes, is formed of a corrosion-resistant material, in particular provided with a corrosion-resistant coating.

In addition, wall thicknesses of walls bounding adjacent labyrinth sections are individually designed, depending on which media in the labyrinth sections 21 to 24 on the one hand and 27 to 29 on the other hand flow. The same can be provided for wall thicknesses of walls which are directly connected to the third medium, namely the storage medium 12 contact.

LIST OF REFERENCE NUMBERS

1

 Household refrigerator

2

 inner container

3

 inner space

4

 inner space

5

 door

6

 door

7

 casing

8th

 Primary refrigerant circuit

9

 heat exchanger unit

10

 Secondary refrigerant circuit

11

 cold storage

12

 storage medium

13

 heat exchangers

14

 Area

15

 partition wall

16

 Fan

17

 feed pump

18

 heat exchangers

19

 thermal coupling unit

20

 heat exchanger unit

21

 first flow labyrinth

22

 labyrinth section

23

 labyrinth section

24

 labyrinth section

25

 plenum

26

 second flow labyrinth

27

 labyrinth section

28

 labyrinth section

29

 labyrinth section

30

 plenum

31

 outside

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 102010041952 A1 [0003]
• GB 2057109 A [0005]
• DE 102011079208 A1 [0006]
• WO 2014/133394 A1 [0009]

Claims (14)

Heat exchanger ( 18 ), in particular for a refrigeration cycle of a household refrigerating appliance ( 1 ), which is a thermal coupling unit ( 19 ), with which a thermal energy exchange between media can be carried out, and which is designed as an MPE component, characterized in that the MPE component integrated a first flow labyrinth ( 21 ) for a first medium, and a separate second flow labyrinth ( 26 ) for a second medium, which is provided with labyrinth sections ( 27 . 28 . 29 ) directly to labyrinth sections ( 22 . 23 . 24 ) of the first flow labyrinth ( 21 ) and the labyrinth sections ( 22 . 23 . 24 . 27 . 28 . 29 ) are arranged such that viewed in an extension direction of the MPE component a plurality of labyrinth sections ( 22 . 23 . 24 ) of the first flow labyrinth ( 21 ) alternating with a plurality of labyrinth sections ( 27 . 28 . 29 ) of the second flow labyrinth ( 26 ) are arranged. Heat exchanger ( 18 ) according to claim 1, characterized in that the heat exchanger ( 18 ) a first collection chamber ( 25 ) for the first medium, which in the first flow labyrinth ( 21 ), to which the labyrinth sections ( 22 . 23 . 24 ) of the first flow labyrinth ( 21 ). Heat exchanger ( 18 ) according to claim 1 or 2, characterized in that the heat exchanger ( 18 ) a second collection chamber ( 30 ) for the second medium, which in the second flow labyrinth ( 26 ), to which the labyrinth sections ( 27 . 28 . 29 ) of the second flow labyrinth ( 26 ). Heat exchanger ( 18 ) according to claim 2 or 3, characterized in that the collecting chambers ( 25 . 30 ) are formed at opposite ends of the MPE component. Heat exchanger ( 18 ) according to one of the preceding claims, characterized in that labyrinth sections ( 22 . 23 . 24 ) of the first flow labyrinth ( 21 ) are rectilinear and are arranged parallel to one another and / or labyrinth sections ( 27 . 28 . 29 ) of the second flow labyrinth ( 26 ) are rectilinear and are arranged parallel to each other. Heat exchanger ( 18 ) according to one of the preceding claims, characterized in that labyrinth sections ( 22 . 23 . 24 ) of the first flow labyrinth ( 21 ) are arranged meander-shaped and / or labyrinth sections ( 27 . 28 . 29 ) of the second flow labyrinth ( 26 ) are arranged meandering. Heat exchanger ( 18 ) according to one of the preceding claims, characterized in that labyrinth sections ( 22 . 23 . 24 ) of the first flow labyrinth ( 21 ) are arranged spirally and / or labyrinth sections ( 27 . 28 . 29 ) of the second flow labyrinth ( 26 ) are arranged spirally. Heat exchanger ( 18 ) according to one of the preceding claims, characterized in that wall thicknesses of the labyrinth sections ( 22 . 23 . 24 . 27 . 28 . 29 ) mutually delimiting walls of the MPE component depending on the by the flow labyrinths ( 21 . 26 ) are provided and / or wall thicknesses of outwardly exposed walls of the labyrinth sections ( 22 . 23 . 24 . 27 . 28 . 29 ) are formed depending on contactable with these walls further media. Heat exchanger ( 18 ) according to one of the preceding claims, characterized in that the coupling unit ( 19 ) is formed of aluminum as MPE component. Heat exchanger ( 18 ) according to one of the preceding claims, characterized in that an outside ( 31 ) of the MPE component is formed of a corrosion-resistant material. Heat exchanger ( 18 ) according to claim 10, characterized in that the outside ( 31 ) is provided with a corrosion resistant coating. Household refrigeration appliance ( 1 ) with a heat exchanger ( 18 ) according to any one of the preceding claims. Household refrigeration appliance ( 1 ) according to claim 12, characterized in that it is a no-frost domestic refrigeration appliance ( 1 ), which is provided with a housing ( 7 ), in which an interior ( 3 . 4 ) is designed for receiving food, and which with a primary refrigeration cycle ( 8th ) formed with a heat exchanger unit ( 9 ) with a cold storage ( 11 ) is thermally coupled, and which with a secondary refrigeration cycle ( 10 ) is formed, which with a further heat exchanger unit ( 20 ) with the cold storage ( 11 ) is thermally coupled and for cooling the interior ( 3 . 4 ) and with the interior ( 3 . 4 ) is thermally coupled, wherein the two heat exchanger units ( 9 . 20 ) through the one heat exchanger ( 18 ) are formed. Household refrigeration appliance ( 1 ) according to claim 13, characterized in that the heat exchanger ( 18 ) in the cold storage ( 11 ) and of one in cold storage ( 11 ) storage medium ( 12 ) is surrounded.

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