WO2017152986A1

WO2017152986A1 - Heat exchanger unit and cooling system having a heat exchanger unit

Info

Publication number: WO2017152986A1
Application number: PCT/EP2016/055205
Authority: WO
Inventors: Frank Vetter
Original assignee: Bitzer Kühlmaschinenbau Gmbh
Priority date: 2016-03-10
Filing date: 2016-03-10
Publication date: 2017-09-14
Also published as: EP3426997A1

Abstract

The invention relates to a heat exchanger unit for a cooling system guiding a coolant in a coolant circuit, wherein the heat exchanger unit has a heat-emitting heat exchanger with a heat-emitting flow path for the coolant and a heat-receiving flow path for a second heat transportation medium, and a heat-receiving heat exchanger with a heat-receiving flow path for the coolant and a heat-emitting flow path for a first heat exchanger medium, wherein the heat exchanger unit is formed in a stacked construction and has structure layers and cover layers alternating in a stacking direction, wherein the structure layers determine a course of the flow paths for the coolant or the heat transportation medium transverse to the stacking direction and the cover layers cover and limit the flow paths in the stacking direction, and wherein at least one of the flow paths for the coolant runs in at least one of the structure layers and at least one of the flow paths for one of the heat transport media runs in at least one of the other structure layers.

Description

- -

HEAT EXCHANGE UNIT AND COOLING SYSTEM WITH A HEAT EXCHANGE UNIT

The invention relates to a heat exchanger unit for a refrigeration system which leads a refrigerant in a refrigerant circuit, wherein the heat exchanger unit comprises a heat-emitting heat exchanger with a heat-emitting flow path for the refrigerant and a heat-absorbing flow path for a second heat-transport medium and a heat-absorbing heat exchanger with a heat-absorbing flow path for the refrigerant and a heat-emitting ^Having flow ^¬ path for a first heat exchanger medium.

Such heat exchanger units are known from the prior art.

In these heat exchanger units, there is the problem of making these on the one hand as efficient as possible and on the other hand as compact and inexpensive as possible.

This object is achieved in a heat exchanger unit of the above

described type solved according to the invention that the heat exchanger ^¬ unit is constructed in stacked construction and alternately in a stacking structure layers and cover layers, that the structure layers define a profile of the flow paths for the refrigerant or the heat transfer media transversely to the stacking direction and the cover layers, the flow paths in the stacking direction cover, limit and that in at least one of the structural layers at least one of the flow paths for the refrigerant and in at least one other of the structural layers of at least one of the flow paths for one of the heat transfer media. - -

The advantage of the solution according to the invention lies in the fact that due to the stacked construction, a simple realization of the flow paths combined with an efficient function, in particular an efficient heat transfer, with a compact design and thus low internal volume for the refrigerant is possible.

An advantageous solution provides that an intended for the refrigerant internal volume of the heat exchanger unit is less than one thousand cubic centimeters.

It is more favorable if the internal volume of the heat exchanger unit provided for the refrigerant is less than eight hundred cubic centimeters.

It is even better if the internal volume of the heat exchanger unit provided for the refrigerant is less than six hundred cubic centimeters.

A further advantageous solution provides that an intended for the refrigerant internal volume of the heat-emitting heat exchanger of the heat exchanger unit is less than five hundred cubic centimeters.

It is even better if the provided for the refrigerant inner

Volume of the heat-emitting heat exchanger is less than four hundred cubic centimeters, more preferably less than three hundred cubic centimeters.

With regard to the detection of the intended for the refrigerant inner volume of the heat-emitting heat exchanger of the heat exchanger unit is preferably provided that in this case the volume of the connection for coming from the refrigerant compressor refrigerant line is used to a leading to the expansion element refrigerant line, wherein the expansion element preferably an external, not in the heat exchanger unit integrated expansion element. - -

In this case, if so, the volume of an inner

Heat exchanger included.

The function of the heat-emitting heat exchanger in the heat exchanger unit can be realized in a particularly favorable manner in that the at least one heat-emitting flow path for the refrigerant and the at least one heat-absorbing flow path for the second heat-transport medium overlap each other on opposite sides of at least one of the cover layers and the heat transfer between the flow paths through this cover layer is carried out.

With this design solution can be realized in particular with high efficiency, a heat transfer between the flow paths and the heat-emitting heat exchanger.

Furthermore, it is preferably provided that in the heat-receiving heat exchanger, the at least one heat-absorbing flow path for the refrigerant and the at least one heat-emitting flow path for the first heat-transport medium overlap each other on opposite sides of at least one of the cover layers and that the heat transfer takes place through this cover layer.

Thus, a particularly efficient and compact solution is also available for the heat-absorbing heat exchanger.

Particularly favorable is a solution in which the heat-emitting

Flow path and the heat-absorbing flow path for the refrigerant ^¬ each extending in the same structural position, so that this structure layer can be designed specifically for the flow paths for the refrigerant.

A further advantageous solution provides that in one of the structural layers an internal heat exchanger is provided. - -

Such an internal heat exchanger provides the opportunity to further increase the efficiency of the refrigeration system according to the invention.

In particular, it is provided in such an internal heat exchanger that it is arranged in the same structural position as the heat-emitting flow path and the heat-absorbing flow path for the refrigerant, so that one and the same structural position can be optimized for the guidance of the refrigerant can be formed.

With regard to the function of the internal heat exchanger, no detailed information has been provided so far.

It is particularly advantageous if, in the inner heat exchanger, refrigerant flowing from the heat-emitting flow path and flowing to the expansion element releases heat to the refrigerant coming from the heat-receiving flow path before reaching the expansion element.

Thus, on the one hand the refrigerant is additionally cooled before reaching the expansion element, so that thereby the temperature of the refrigerant can be further reduced after expansion and on the other hand, the coming of the heat-receiving flow path refrigerant is heated before compression by the refrigerant compressor to ensure that this no Shares of liquid refrigerant more leads to the compressor.

A particularly favorable construction provides that the inner heat exchanger has a first cooling path for the refrigerant coming from the heat-emitting flow path and has a warm-up path for the refrigerant coming from the heat-receiving flow path.

These flow paths could run in any way in the inner heat exchanger. - -

A particularly efficient form of construction of the internal heat exchanger provides that in this the first cooling path and the heating path for the refrigerant are separated by an intermediate ^wall through which the heat ^¬ transfer occurs, wherein the intermediate wall can be designed so that the most favorable Heat transfer between the Abkühlpfad and the

Warm-up path takes place.

Another favorable solution provides that adjoins the cooling path of the internal heat exchanger an additional cooling path, wherein

In particular, in the Zusatzabkühlpfad carried a transfer of heat from the guided in this refrigerant into the refrigerant in the heat-receiving flow path.

In particular, the additional cooling path is also arranged in the structural element forming the heat-receiving flow path.

For example, the auxiliary cooling path is arranged to extend adjacent to the heat-receiving flow path and thus to be able to release heat to the heat-receiving flow path.

With regard to the arrangement of the heat-emitting flow path and the heat-receiving flow path relative to each other in the respective structural position, no further details have been given so far.

Thus, a particularly favorable solution provides that the heat-emitting flow path and the heat-absorbing flow path for the refrigerant are arranged in the same structural layer thermally separated from each other, as much as possible to suppress or avoid heat transfer from the heat-emitting flow path to the heat-receiving flow path. - -

This can be realized, for example, in that the heat-emitting flow path and the heat-absorbing flow path for the refrigerant are separated from each other by an insulating chamber arranged between them.

The thermal separation of the heat-emitting flow path from the heat-receiving flow path can be implemented particularly advantageously by separating the heat-emitting flow path and the heat-absorbing flow path for the refrigerant from one another by means of an internal heat exchanger arranged between them.

With this internal heat exchanger on the one hand there is the possibility to increase the efficiency of the refrigeration system and on the other hand the possibility of thermally separating the heat-emitting flow path and the heat-absorbing flow path in a suitable manner.

With regard to the formation of the heat-emitting flow path in the respective structural position so far no further details have been made.

Thus, a particularly favorable solution provides that the heat-emitting flow path for the refrigerant is arranged in a chamber of the structural layer.

Preferably, the chamber is designed such that it encloses a base surface formed by the cover layer adjoining the respective structural layer, which is larger than the sum of all wall surfaces of the chamber formed by the structural layer, thereby causing the chamber to expand over the base surface has respective cover layers which are larger than the wall surfaces formed by the structural layer and thus the most efficient heat transfer through the respective cover layer is carried out. - -

Furthermore, it is provided to increase the efficiency of the heat transfer, that flow guide elements are arranged in the chamber.

Such flow guide elements allow to specify the flow path for the heat-emitting refrigerant and thus also to optimize the heat ^¬ transmission through the top layer through and also set the flow conditions defined in the chamber.

A further advantageous solution provides that the flow guide elements are connected to the cover layers arranged on both sides of the structure layer, so that the flow guide elements simultaneously serve to connect the cover layers together and thus improve the pressure resistance of the construction of the heat exchanger unit, since

Flow guide elements which cross the respective chamber

Areas of the cover layers are additionally stabilized relative to each other.

In addition, it is preferably provided that the heat-absorbing flow path for the refrigerant is arranged in a chamber of the structure layer.

Also in this chamber is preferably provided that this has a base over the respective cover layer, which is greater than the wall surfaces formed by the structural layer of the chamber, so that the chamber in the direction of expansion of the cover layer has the largest possible extent, while the extent is significantly lower across the top layer.

It is particularly favorable if flow guidance elements for fixing the heat-receiving flow path are provided in the chamber.

On the one hand, these flow guide elements determine the course of the heat-absorbing flow path for optimally optimized flow guidance and, on the other hand, permit an improvement in the heat transfer. - -

The flow guide elements are also advantageous when they are connected to the cover layers arranged on both sides of the structural layer, in order to additionally connect and stabilize the regions of the cover layers which engage over the chamber relative to one another, so that in particular the compressive strength of the heat exchanger unit according to the invention Area of the respective chamber is improved.

In the formation of chambers for receiving the heat-emitting and the heat-absorbing flow path, it has proved to be useful if the flow paths for the refrigerant receiving chambers in the structural layer are thermally separated by a formed between them in the structural layer insulating chamber.

Alternatively, it is provided that the chambers receiving the flow paths are thermally separated from one another by an internal heat exchanger arranged between them.

In providing chambers for the flow paths carrying the refrigerant, in particular, the internal volume of the heat exchanger unit provided for the refrigerant is defined by the sum of the volumes of all the chambers for the refrigerant with the volumes of the respective feedthroughs.

Also preferably only the chamber of the heat-absorbing flow path for the refrigerant and the chamber of the heat-emitting flow path for the refrigerant are provided, but no additional chamber serving as a refrigerant collector between the heat-emitting

Refrigerant path and the heat-absorbing refrigerant path is used.

Furthermore, preferably, the chambers are formed so that they have a height between the cover layers of 4 mm or less.

With regard to the flow paths for the heat transfer media, no further details have been given so far. - -

So provides an advantageous solution that the heat-absorbing

Flow path for the second heat transport medium and the heat-emitting flow path for the first heat transport medium are arranged in the same structural layer, so that these structure layer are optimally adapted in terms of their construction and their training to the conditions for the heat transfer media.

It is particularly favorable if the heat-absorbing flow path for the second heat transport medium and the heat-emitting flow path for the first heat transport medium are thermally separated from one another by an intermediate structure arranged in the structure layer.

Such an intermediate structure is formed for example as an insulating chamber.

The insulating chamber can either have a vacuum for insulation or an insulating gas, such as nitrogen receiving

Chamber.

With regard to the formation of the heat-absorbing flow path for the second heat transport medium, no further details were given.

So provides an advantageous solution that the heat-absorbing

Storming path for the second heat transport medium is arranged in a chamber of the structural layer.

Preferably, the chamber is designed so that it encloses a base area over the respectively adjacent cover layer which is larger than the sum of all wall surfaces of the chamber formed by the structural layer, In particular, the chamber has a significant extent in the direction of the extension of the adjacent cover layers in order to obtain the best possible heat transfer through at least one of the respective cover layers.

Furthermore, it is preferably provided that in the chamber Strömungsführungs- elements are arranged, which dictate the course of the flow path.

In particular, further advantages result from the use of flow-guiding elements when the flow-guiding elements are connected to the cover layers arranged on both sides of the structural layer, since the flow-guiding elements extend over the chamber

stabilize extending portions of the cover layers relative to each other.

In addition, a further advantageous solution provides that the heat-emitting flow path for the first heat transport medium is arranged in a chamber of the structural layer, which is formed in particular in the respective structural layer.

Also with regard to the formation of the chamber for the first heat transport medium is preferably provided that this has over the adjacent cover layers a base area which is greater than formed by the structural layer wall surfaces of the chamber, so that also in this chamber efficient heat transfer through the at least one adjacent Cover layer is possible through.

Furthermore, it is favorable for guiding the flow of the first heat transport medium when flow guidance elements are provided in the chamber, which predetermine the course of the flow path. - -

The flow guide elements can also advantageously be additionally used to stabilize the cover layers relative to one another when the flow guide elements are connected to the cover layers arranged on both sides of the structural layer.

Further, it is expediently provided that the chamber receiving the heat-receiving flow path is thermally separated from the chamber receiving the heat-emitting flow path by a heat transfer structure suppressing the intermediate structure.

In particular, it is provided that the intermediate structure is formed as an insulating chamber.

With regard to the chambers for the heat transfer media, no further details were given.

Preferably, the chambers for the heat transfer media are formed so that they have a height between the cover layers of less than 4 mm.

With regard to the training of the expansion organ so far no further details have been given.

Thus, an advantageous solution provides that the expansion element is an expansion element arranged outside the respective structural layer.

Preferably, the expansion member on the uppermost cover layer of

Heat exchanger unit arranged.

A particularly expedient solution provides that the expansion element is fixed on the uppermost cover layer. - -

For easy detection of one for controlling the expansion organ

required temperature of the expanded refrigerant is preferably provided that on a side opposite the expansion member of the top cover layer, on which the expansion element is arranged, which is arranged the heat-absorbing flow path for the refrigerant structure layer, so that the temperature of the expanded refrigerant corresponding temperature a sensor can be easily detected, for example, in an adjacent to the flow of the expanded refrigerant area of the cover layer.

A particularly advantageous solution provides that the expansion element has a housing which has a passage through which the refrigerant guided to the refrigerant compressor and in which a temperature-detecting element is arranged, which controls an expansion valve element, so that arranged with the in the housing temperature sensing element, the temperature of the refrigerant for controlling the expansion valve unit can be detected without the installation of a sensor is necessary.

An advantageous solution provides that the housing in particular as

Housing block is formed, and disposed on the cover layer and that at least one connection opening of the housing block is arranged a connection of the heat exchanger unit across.

Thus, the connection between the heat exchanger unit and the expansion element can be produced particularly easily and at the same time create a stable and compact unit.

It is particularly advantageous if at least two connection openings of the housing block two connections of the heat exchanger unit are arranged across. - -

Another advantageous solution provides that the expansion element is integrated into the structural layer.

Furthermore, with regard to the formation of the structural layers and the

Cover layers no details provided.

For example, it would be conceivable to produce the structural layers and the cover layers from a wide variety of materials.

However, it is particularly advantageous, in terms of ease of manufacture and optimum heat transfer, when the structural layers and the cover layers are made of metal.

As advantageous materials for the structural layers and / or the cover layers aluminum or steel have been found.

Furthermore, no details were given regarding the connection of the structural layers and the cover layers.

It is particularly expedient if the structural layers and the cover layers are bonded together in a material-locking manner.

In particular, it is preferably provided that the structural layers and the cover layers are joined together by soldering.

Alternatively, it would be conceivable that the structural layers and the cover layers are bonded together by gluing.

In addition, the inventive solution relates to a refrigeration system, comprising a refrigerant circuit, in which a heat exchanger unit is arranged, which is also arranged in a first heat transport circuit, in which a first heat transport medium circulates, and is arranged in a second heat transport circuit, in which a second - -

Heat transfer medium circulates, wherein both the first heat transport circuit and the second heat transport circuit by means of the heat transfer media perform a phase transition heat transfer to each arranged in these heat exchangers and wherein the heat exchanger unit is formed according to one of the preceding claims.

It is particularly advantageous if both the first heat transport medium and the second heat transport medium are based on water.

An advantageous embodiment of the refrigeration system according to the invention provides that the refrigerant circuit with the heat exchanger unit and a refrigerant compressor forms a modular unit and that the module unit is detachably einbindbar in the first heat transport circuit and / or the second heat transport circuit, that is, the heat exchanger unit together with the refrigerant compressor as simply removable unit is provided.

In this case, it is particularly expedient if the module unit comprises the heat exchanger unit, the refrigerant compressor and the expansion element, which are connected to one another to form the modular unit and thus form a unit which can be exchanged uniformly.

Furthermore, it is preferably provided that the heat exchanger unit are connected to the first and the second heat transfer circuit by means of detachable and in particular a loss of the respective heat transfer medium preventing connecting elements.

Such fasteners are, for example, quick-release couplings, which simultaneously prevent loss of the heat transfer medium through appropriate check valves. - -

This solution has the great advantage that in a simple manner the module ^¬ unit can be solved by the first heat transport circuit and / or the second heat transport circuit.

The solution according to the invention is advantageous, for example, in a refrigeration system in which the refrigerant circuit and the first heat transport circuit are arranged on a stationary object having a space to be cooled.

The refrigeration system according to the invention can also be used in particular for

Air conditioning and / or heating in the mobile sector, that is used in caravans or mobile homes or living quarters of vehicles or residential containers or mobile buildings.

A further advantageous field of use are temperature-sensitive systems or goods receiving spaces or containers to be conditioned or heated, such as, for example, rooms or containers for electrical or mechanical installations or perishable goods such as biological material or foodstuffs.

Other features and advantages are the subject of the following

Description and the drawings of some embodiments.

In the drawing show:

Fig. 1 shows a first embodiment of a refrigeration system according to the invention;

2 shows a section through a heat exchanger unit according to the invention of the first embodiment along line 2-2 in Fig. 3. - -

3 shows a section through a refrigerant-carrying structure layer along the line

3-3 in Fig. 2;

4 shows a section through a heat transport medium-guiding structure layer along line 4-4 in Fig. 2.

Fig. 5 is a section through a refrigerant-carrying structure layer similar

3 in a second embodiment of a heat exchanger unit of a refrigeration system according to the invention;

6 shows a section through a heat exchanger media-guiding structure layer similar to FIG. 4 in the second exemplary embodiment of a heat exchanger unit of a refrigeration system according to the invention;

7 shows a view similar to FIG. 1 of a third exemplary embodiment of a refrigeration system according to the invention;

8 shows a section similar to FIG. 2 through a heat exchanger unit of the third exemplary embodiment of the refrigeration system according to the invention;

9 shows a section through a refrigerant-carrying structure layer along the line

9-9 in Fig. 8;

Fig. 10 is a schematic, the pressure over the enthalpy performing

Diagram for explaining the operation of an internal heat exchanger in the third embodiment;

11 shows a section through a heat exchanger media-guiding structure layer along line 11-11 in FIG. 8;

FIG. 12 is a section similar to FIG. 9 through a structural layer of a heat exchanger unit according to a fourth embodiment of a refrigeration system according to the invention; - -

13 shows a section similar to FIG. 12 through a structural layer of a heat exchanger unit of a fifth exemplary embodiment of a refrigeration system according to the invention;

14 is a section similar to FIG. 9 through a structural layer of a heat exchanger unit of a sixth embodiment;

Fig. 15 is a section along line 15-15 of FIG. 14;

16 is a section similar to FIG. 12 through a structural layer of a heat exchanger unit of a seventh embodiment of a refrigeration system according to the invention;

Fig. 17 is an enlarged sectional view through an expansion element of the seventh embodiment and

Fig. 18 is a perspective view of the heat exchanger unit with the mounted on this expansion element.

An illustrated in Fig. 1 and designated as a whole with 10 refrigeration system is formed for example as a stationary refrigeration system and assigned to a space to be cooled 12 comprehensive stationary object 14.

For example, the refrigeration system 10 is fixedly installed on the object 14.

Another advantageous solution provides that the refrigeration system 10 is designed as a module that is interchangeable. - -

The refrigeration system 10 includes a refrigerant circuit 20 with a refrigerant compressor 22, a heat-emitting heat exchanger 24, which is supplied from the refrigerant compressor 22 compressed refrigerant, a heat-absorbing heat exchanger 26, which via a

Expansion element 28 is supplied to the refrigerant from the heat-emitting heat exchanger 24, which in turn is supplied to the refrigerant compressor 22 through the refrigerant circuit 20 after flowing through the heat-absorbing heat exchanger 26.

In the refrigeration system 10 according to the invention, the space 12 to be cooled is not directly cooled by the heat-absorbing heat exchanger 26, but the heat-absorbing heat exchanger 26 is constructed so that it is not only flowed through by the refrigerant of the refrigerant circuit 20, but also by a first heat transport medium is guided in a first heat transport circuit 30, wherein the heat-absorbing heat exchanger 26 in turn is not only disposed in the refrigerant circuit 20, but also in the first heat transport circuit 30, in which also arranged in the space to be cooled 12 heat exchanger 32 is disposed, preferably still a fan unit 34 is associated, which circulates a arranged in the space to be cooled 12 cooling medium to cool the space 12 evenly.

Furthermore, in the first heat transport circuit 30, a circulation pump 36 is provided, which circulates the first heat transport medium in the first heat transport circuit 30 so that this heat is transported from the heat exchanger 32 to the heat-absorbing heat exchanger 26 and emits in this to the recirculated refrigerant in the refrigerant circuit 20.

Preferably, the circulation pump 36 is installed in the module formed by the refrigeration system 10. - -

The heat-emitting heat exchanger 24 does not release the heat directly to the environment, but is arranged in a second heat transport circuit 40, in which a second heat transport medium circulates, the second heat transport circuit 40 having a heat exchanger 42, which at a suitable distance from that to be cooled Space 12 comprehensive object 14 is arranged, wherein the heat exchanger 42 is also associated with a blower unit 44.

The heat exchanger 42 outputs the heat to a receiving this medium, such as ambient air, from which is received by the second heat transport circuit 40 in the heat-emitting heat exchanger 24 of the refrigerant circuit 20 and transported through the second heat transfer medium to the heat exchanger 42.

In this case, in the second heat transport circuit 40 optionally a circulation pump 46 may be provided or it is provided that in this the second heat transport medium 40 rotates due to gravity.

In the case of the refrigeration system 10 according to the invention, it is preferably provided that these are located on the object 14 and thus close to the space 12 to be cooled

is arranged so that the first heat transport circuit 30 is capable of as short as possible and most effective the heat from the

Heat exchanger 32 to transport the heat-absorbing heat exchanger 26, while the lines in the second heat transport circuit 40 between the heat-emitting heat exchanger 24 and the heat-emitting heat exchanger 42 in operation have a temperature which is higher than a conventional ambient temperature, so that the thermal insulation thereof for the performance the refrigeration system 10 are not critical, and consequently the possibility exists to arrange the heat exchanger 42 in almost any distance relative to the heat-emitting heat exchanger 24 and also the lines between the heat-emitting - -

Heat exchanger 24 and the heat-emitting heat exchanger 42 according to the distance between the heat exchanger 42 and the heat-emitting heat exchanger 24 without significant influence on the efficiency of the refrigerant circuit 20 to move.

Thus, ultimately, the removal of the heat exchanger 42 from the heat-emitting heat exchanger 24 is a substantially arbitrary parameter in the design of the refrigeration system 10.

In the solution according to the invention, the heat-emitting heat exchanger 24 and the heat-absorbing heat exchanger 26 are integrated in a designated as a whole with 50 heat exchanger unit, so that the refrigerant circuit 20 on the one hand, the heat exchanger unit 50 and on the other hand leading from the heat-absorbing heat exchanger 26 to the refrigerant compressor 22 refrigerant line 52 and the the refrigerant compressor 22 to the heat-emitting heat exchanger 24 leading refrigerant line 54 so that thereby the refrigerant circuit 20 has a low spatial

Has expansion and therefore requires a small volume of refrigerant needed. The paths from the heat-absorbing heat exchanger 26 to the heat exchanger 32 in the space to be cooled 12 and between the heat-emitting heat exchanger 24 and the heat-emitting heat exchanger 42 are realized by the first heat transport circuit 30 and the second heat transfer circuit 40, in each of which the first heat transport medium or the second

Heat transport medium flows, which is an easy-to-lead and not under great pressure or environmentally non-relevant medium, such as in particular a water-based medium, for example a mixture of water and glycol or water and salt, etc. - -

The refrigeration system according to the invention thus permits, on the one hand, a minimization of the volume of the refrigerant in the refrigerant circuit 20 while at the same time providing great spatial flexibility with regard to the heat-absorbing heat exchanger 32 and the heat-emitting heat exchanger 42 arranged in the space 12 to be cooled with technically uncomplicated routing for the first heat transport medium and the second heat transport medium.

In a design of the refrigeration system as a module is provided, for example, that the module includes the refrigerant circuit 20 with the refrigerant compressor 22, the heat-emitting heat exchange tube 24 and the heat-absorbing heat exchanger 26, wherein the heat-emitting heat exchanger 24 and the heat-absorbing heat exchanger 26 via detachable connection elements, such as quick couplings with the components provided in the second heat transport circuit 40 or in the first heat transport circuit 30, such as the circulation pump and the heat exchanger, can be connected.

The compact construction of the heat exchanger unit 50 results from the fact that these, as shown in Fig. 2, constructed in stacked construction, wherein in a stacking direction 62 structural layers 64 and cover layers 66 alternate with each other.

By means of the structural layers 64, the flow paths for the refrigerant, the first heat transport medium and the second heat transport medium are realized at least to a considerable extent, while the cover layers 66 cover and close each of the structural layers 64 in the stacking direction 62 on both opposite sides. - -

In this case, the structural layers 64 extend in the direction transversely, preferably perpendicular to the stacking direction 62 and thus form in a plane transversely, in particular perpendicular to the stacking direction 62 extending flow paths, which completely pass through the structural layers 64 in the stacking direction 62, so that the flow paths seen in the stacking direction 62 on the bottom and the top are open.

The cover layers 66 also extend transversely, preferably perpendicular to the stacking direction 62, and close by the fact that a cover layer 66 is arranged on each side of each structure layer 64, the flow paths in the stacking direction.

Furthermore, the cover layers 66 preferably also include openings which allow access to the flow paths in the structural layers 64.

As shown in FIG. 3, for example, the structural layer 64K comprises a chamber 72, which is enclosed on all sides by chamber walls 74 which extend between the structural layer 64K in the stacking direction 62 on both sides

covering cover layers 66 and thus the chamber 72 define, which has, for example, a rectangular shape.

The chamber 72 can also be formed in any desired shape, wherein the chamber 72 in the plane transverse to the stacking direction 62 has a base GF, which in particular is larger, preferably a multiple greater than the sum of all formed by the structural layer 64K Wall surfaces WF of the chamber 72 enclosing chamber walls 74th

The chamber 72 is thus able to form a flow path 76 for the heated and thus heat-emitting refrigerant, which extends from an inlet opening 82 to an outlet opening 84 of the chamber 72. In this first embodiment, the outlet port 84 is provided in a portion of the chamber 72 which is located at a maximum distance from the inlet port 82. - -

The outlet opening 84 is connected to a refrigerant line 86 passed through the cover layer 66W, the structural layer 64T and the topmost cover layer 66AO, in which an external expansion element 88, for example one on the uppermost cover layer 66AO of the heat exchanger unit 50

arranged expansion element 28, and which leads to a further chamber 92, which is also surrounded by formed by the structural layer 64K chamber walls 94.

In this case, the chamber 92 is in a direction transverse to the stacking direction 62 transverse direction at a distance from the chamber 72, so that each of the chambers 72 and 92 is enclosed by its own chamber walls 74 and 94 respectively. Also, the chamber 92 has in the direction transverse to the stacking direction 62, a base GF, which is greater than the sum of all wall surfaces WF of the formed by the structural layer 64K chamber walls 94 extending between the stacking direction 62 opposite cover layers 66.

Thus, the chamber 92 also forms a flow path 96 which extends from an inlet opening 102, which in this case is also connected to the refrigerant line 86, to an outlet opening 104.

In particular, the chambers 72 and 92 are thermally decoupled from one another by an insulating chamber 100 located between them and realized in the structural layer 64K.

For integration into the refrigerant circuit 20, the outlet port 104 of the chamber 92 is connected to the refrigerant piping 52 leading to the refrigerant compressor 22, and the inlet port 82 is connected to the refrigerant piping 54 coming from the refrigerant compressor 22. - -

Thus, in the structural layer 64K, both the flow path 76 for the heat-emitting compressed refrigerant is realized, and also the flow path 94 for the heat-absorbing refrigerant expanded by the expansion element 88 is realized.

For example, in the stacking direction 62 on both sides of the structural layer 64K, which is additionally covered on both sides by cover layers 66W in the stacking direction 62, a structural layer 64T is arranged, which in FIG. 4 is shown.

Each of the structural layers 64T comprises a chamber 112 arranged in the heat exchanger unit 50 with the chamber 72 at least overlapping on a side of the respective cover layer 66W facing away from the chamber 72, which chamber is likewise surrounded by chamber walls 114 extending in the stacking direction 62 between facing cover layers 66 extending, wherein between the chamber 112 and the chamber 72, the cover layers 66W are arranged, which allow a good heat flow between the chamber 72 and the chambers 112.

The chambers 112 also have a base area GF corresponding to the extent transverse to the stacking direction 62, which is greater than the sum of all the wall surfaces WF of the chamber walls 114 formed by the structural layer 64T, wherein preferably, as shown in FIG. 2, the base GF of the

Chambers 112 is the same size as the base GF of the chamber 72nd

The chambers 112 are provided with inlet ports 122 and outlet ports 124 connected to the second heat transport circuit 40 such that the second heat transport medium of the second heat transport circuit 40 can flow through the chamber 112 along a flow path 116 formed by the chamber 112. - -

Thus, there is a possibility that the second heat transport medium in the chambers 112 can absorb heat transferred from the cover sheet 66W from the refrigerant flowing along the flow path 76 and can be transported to the heat exchanger 42 which releases the heat to the environment, for example.

For mutual termination of the structural layers 64T, these are closed on their sides facing away from the cover layers 66W with cover layers 66A.

Thus, the structural layer 64K, the cover layers 66W disposed on both sides thereof, the structural layers 64T and the cover layers 66A closing the structural layers 64T in the region of the chambers 72 and 112 form the heat-emitting heat exchanger 24, which transfers the heat entrained by the refrigerant in the chamber 72 into the chambers 112, from which this heat can be transported by means of the second heat transport medium in the second heat transfer circuit 40 to the heat exchanger 42, which then releases this heat to the environment, the second heat transport medium is preferably a liquid that is not environmentally critical and thus in can be performed in a simple manner from the first heat exchanger 24 to the heat exchanger 42.

As shown in FIG. 4, the structural layers 64T comprise a further chamber 132 which is likewise formed by the structural layers 64T

Chamber walls 134 are enclosed, wherein the chambers 132 are each preferably arranged on one of the chamber 92 opposite side of the respective cover layer 66W.

The chamber 132 also has a base area GF in a direction transverse to the stacking direction 62, which is greater than the sum of all wall surfaces WF of the chamber walls 134 formed by the structural layer 64T. - -

Preferably, the footprint GF of the chamber 132 is approximately equal to or equal to the footprint GF of the chamber 92, and the chambers 132 are overlapped, preferably congruently overlapping, on the opposite sides of the topsheets 66W.

The chamber 132 also forms a flow path 136 which leads from an inlet port 142 to an outlet port 144, the chamber 132 being disposed in the first heat transport circuit 30 in which the first heat transport medium is conducted in the chamber 132 as it travels along the path Flow path 136 dissipates heat, which passes through the cover layers 66W through into the chamber 92 and is received there by the refrigerant flowing through the chamber 92 along the flow path 96.

Thus, the chambers 132 and the chamber 92 lying between them form the heat-absorbing heat exchanger 26 of the heat exchanger unit 50 which extracts heat from the first heat transport medium, which in turn receives the first transport medium via the heat exchanger 32 within the space 12 to be cooled and thus the space to be cooled 12 withdraws.

In connection with the previous explanation of the first exemplary embodiment, it was not explained in detail how a connection of the inlet opening 82 and the outlet opening 104 for the refrigerant should take place.

Preferably, the connection of the inlet opening 82 and the outlet opening 104 is made via one of the cover layers 66A, for example the topmost cover layer 66AO and via passages 152 and 154 provided in the structural layers 64T, allowing connections 162 and 164 disposed on the topmost cover layer 66AO proceeding to pass the refrigerant through the feedthroughs 152 and 154 through the structural layer 64T which adjoins the cover layer 66AO up to that in the cover layer 66W The structural layer 64T and the structural layer 64K have an inlet opening 82 and an outlet opening 104.

In addition, passages 156 and 158 for the refrigerant line 86 having the expansion element 88 are provided in the structural layer 64T in order to pass them through the cover layer 66W and the uppermost cover layer 66 AO.

Likewise, the structural layer 64K is as shown in FIG. 3, are provided with passages 172 and 174 interconnecting the inlet port 122 and the outlet port 124 of the chambers 112 and, moreover, the capping layer 64AO is provided with respective ports 182 and 184 for the second heat transporting circuit 40.

In addition, the structural layer 64K is provided with passages 192 and 194 connecting the respective inlet port 142 and the outlet port 144 of the chamber 132, and further, ports 202 and 204 for the first heat transport circuit 30 are provided in the cap layer 66AO.

Thus, it is possible, starting from a cover layer, in this case the cover layer 66AO, to guide the connections to the chambers 72 and 92 or 112 and 132.

In a second exemplary embodiment of a heat exchanger unit 50 'according to the invention, illustrated in FIGS. 5 and 6 by the illustration of the structural layers 64K and 64T, the chambers 72, 92 as well as 112 and 132 with flow guidance elements 212 and 214 or 222 and 224 or 232 and 242, respectively provided that define the course of the flow paths 76 and 96 or 116 and 136, wherein the flow guide elements 212 and 222, 224 or 232 or 242 parallel

Flow paths for the flow paths 76, and 96, respectively, Specify - or 116 or 136 and, for example, the flow guide elements 214 pretend a meander-like course with extension of the flow paths.

The flow guide elements 212, 214 or 222, 224 or 232 or 242 can be arranged in different orientations in the respective chambers 72, 92, 112 and 132 and be adapted to the desired conditions depending on the design and flow.

The flow guide elements 212, 214 or 222, 224 or 232 and 242 also serve to connect the 66 disposed on both sides of the structural layers 64K and 64T cover layers 66 and thus make it possible, the wall thickness of the cover layers 66 despite the pressure conditions, in particular in the chambers 72 and 92 as possible to thereby reduce the heat transfer from the chambers 72 and 92 into the chambers 112 and 132.

Moreover, in the second embodiment, all those elements which are identical to those of the first embodiment are provided with the same reference numerals, so that reference can be made in this regard to the comments on the first embodiment.

In a third exemplary embodiment of a refrigeration system 10 "according to the invention, illustrated in FIGS. 7 and 8, those parts which are identical to those of the preceding exemplary embodiments are provided with the same reference numerals, so that reference can be made to the statements on these in their entirety , - -

In particular, it is provided in the third embodiment, that the heat exchanger unit 50 "of the refrigerant compressor 22 and the drawing member 28 not shown in FIG. 7 form a designated as a whole with 250 module unit, which represents a replaceable unit, in particular in the first heat transport circuit 30 and second heat transport circuit 40 is detachably einbindbar formed.

In particular, the module unit 250 also includes the circulation pump 36.

For this purpose, it is preferably provided that the modular unit 250 via detachable connecting elements 252 and 254 and 256 and 258 in the first heat transport circuit 30 and the second heat transfer circuit 40 is einbindbar, wherein the releasable connecting elements 252 to 258 are preferably provided with check valves, the loss of the prevent respective heat transport medium in the respective heat transport circuit 30 and 40 when releasing the connection.

In contrast to the above exemplary embodiments, the heat exchanger unit 50 ", as shown in FIGS. 7 and 8, comprises a multiplicity of structural layers 64 and cover layers 66 arranged successively in the stacking direction.

In the exemplary embodiment illustrated, the heat exchanger unit 50 "comprises, for example, three structure layers 64K constructed identically and shown in FIG. 9, which likewise each have the chamber 72 surrounded by chamber walls 74 and the chamber 92, likewise surrounded by chamber walls 94.

Incidentally, the chambers 72 and 92 also each have a base area GF which is greater than the sum of the wall surfaces WF thereof. - -

However, unlike the previous embodiments, as shown in FIG. 9, an internal heat exchanger, generally designated 260, is integrated between the chambers 72 and 92 in the structural layer 64, which faces the outlet opening 84 "in the chamber walls 74 of the chamber 72 subsequent Abkühlpfad 262, which is separated by a partition wall 264 of a heating path 266 for the refrigerant, wherein the heating path 266 of the provided in the chamber walls 204 outlet opening 104 of the chamber 92 to a terminal 268 for the refrigerant line 52 along the intermediate wall 264th runs.

Thus, on the one hand, the refrigerant coming from the chamber 72 and flowing in the direction of the chamber 92 undergoes cooling in the cooling path 262 by heat transfer to the refrigerant flowing in the warm-up path 266 from the chamber 92 in the direction of the refrigerant compressor 22 through the intermediate wall 264 wherein, in the warm-up path 266, the refrigerant is further heated by the heat transferred through the baffle 264.

The effect of this internal heat exchanger 260 is shown in FIG

Diagram of the pressure over the enthalpy shown, it can be seen from Fig. 10, which effect of the internal heat exchanger 260 through the first Abkühlpfad 262 and the Aufwärmpfad 266 on the pressure and

Entropieverhältnisse in the refrigerant circuit 20 has.

In particular, after the enthalpy increase of the refrigerant along the flow path 96 in the chamber 92, the internal heat exchanger 260 allows the enthalpy of the refrigerant to be further increased before the refrigerant is compressed by the refrigerant compressor 22. - -

After compression, the enthalpy of the refrigerant is reduced through the flow path 76 in the chamber 72, and additional further enthalpy reduction of the refrigerant prior to expansion thereof by the expansion device 28 occurs through the first cooling path 262 of the internal heat exchanger 260.

In addition, in the solution according to the invention preferably the inner heat exchanger 260 is arranged so that it lies between the chamber walls 74 of the chamber 72 and the chamber walls 94 of the chamber 92 and thus a thermal barrier between the heat-emitting

Flow path 76 for the refrigerant and the heat-absorbing

Represents flow path for the refrigerant.

In the simplest, in Fig. 9, the first cooling path 262 extends between the intermediate wall 264 and one of the chamber walls 74 of the chamber 72 and, moreover, the warming path 266 extends between the intermediate wall 264 and one of the chamber walls 94 of the chamber 92 such that the chambers 72 and 92 communicate with their chamber walls 74c and 94c also directly represent walls for the first cooling path 262 and the heating path 266, respectively.

A further increase in the efficiency of the refrigerant circuit is achieved by providing an additional cooling path 272 following the cooling path 262 of the internal heat exchanger 260 which extends along an outside of at least one or more chamber walls, in this case along the chamber walls 94a and 94b up to the expansion member 28 "extends, so that through the outer walls 94a and 94b also through a heat transfer from the refrigerant in the second Abkühlpfad 272 to the refrigerant in the flow path 96 takes place until an expansion of the refrigerant through the expansion element 28" takes place. In the third embodiment, the expansion element is "formed from such ^¬ that this one in the structure capable 64K" 28 is integrated throttle point, so that in contrast to the first two embodiments, no external expansion element 88 is required.

As also shown in FIG. 9, in the same way as in the first embodiment in the chamber 72, the passages 172 and 174 and in the chamber 92, the passages 192 and 194 are provided, which serve to pass the second heat transport medium or the first heat transport medium through the structural element 64K ".

As further shown in FIG. 11, the structural element 64T "in the third embodiment, in the same way as in the first embodiment ^¬ example, the chamber 112, which is surrounded by chamber walls 114, and the chamber 132 which is surrounded by chamber walls 134.

The chamber 112 forms the flow path 116 for the second heat transport medium of the second heat transport circuit 40, while the chamber 132 forms the flow path 136 for the first transport medium of the first heat transfer circuit 30, which are formed in the same manner as in the first embodiment.

Further, just as in the first embodiment between the two chambers 112 and 132, the insulating chamber 140 is provided, which is either filled with nitrogen or having a vacuum depending on the structure of the heat exchanger unit to thermally separate the chambers 112 and 132 from each other.

Preferably, the insulating chamber 140 is arranged so that the insulating ^¬ chamber 140 and the inner heat exchanger 260 are disposed on opposite sides of the respective cover layer 66 and preferably have the same surface area transverse to the stacking direction 62. - -

Moreover, in this embodiment, in the same manner as the first embodiment, the passage 152 is provided in the chamber 112 and, in a modification to the first embodiment, the expanded refrigerant passage 154 is disposed in the isolation chamber 140.

In a fourth embodiment of the refrigeration system 10 according to the invention, as shown in FIG. 12, the structural layer 64K '' 'as modified from the third embodiment is formed so that the inner heat exchanger 260' 'from the outlet opening 84 of the chamber 72, the chamber 92 on several sides, for example three sides, wrapping to the

Expansion member 28 extends so that the first Abkühlpfad 262 '' extends to the expansion device and the heating path 266 extends substantially from a side opposite the expansion element side of the intermediate wall 264 from the outlet opening 104, the chamber 92 surrounding a plurality of sides, and the terminal 268 reaches the refrigerant compressor 22 to be supplied refrigerant.

In addition, a flow guide path 282 is preferably provided subsequent to the expansion member 28, which leads the expanded refrigerant to the wall 94 c of the chamber 92, which separates the chamber 92 from the heating path 266, so that the expanded and partially liquid fractions having refrigerant on one Outlet 268 on the opposite side of the chamber wall 94 c impinges on these and thus strikes the portion 94 on the chamber wall 94 c, which is heated the most, so that the liquid portions evaporate in the expanded refrigerant as quickly as possible.

In addition, in the chamber 92, a flow guide member 222 "'is provided, which defines the flow path 96''' for the refrigerant in the form of a U-shaped loop within the chamber 92. - -

Also in the fourth embodiment, the structural element 64 T is formed according to the third embodiment, wherein the

Chambers 92 and 112 and 92 and 132 are respectively disposed on opposite sides of the cover layer lying between these structural elements 64K '"and 64T and preferably have the same extent.

Furthermore, the inner heat exchanger 260 and the insulating chamber 140 are preferably also arranged on opposite sides of the cover layer 66W lying between them and have the same course in a plane perpendicular to the stacking direction 62.

Incidentally, those parts of the fourth embodiment, which are identical to those of the preceding embodiments, provided with the same reference numerals, so that the comments on the above embodiments, reference is made in full.

In a fifth embodiment, shown in FIG. 13, the structural layer 64K '' 'also includes the chambers 72 and 92 as well as the internal heat exchanger 260' '', however, the formation thereof in the transverse or, in particular, perpendicular to the stacking direction 62 in the direction of spacing of the chambers 72 and 92 is stretched to the Heat transfer from the chamber 72 into the chamber 92 to reduce.

Further, the heat exchanger 260 "" is formed so that the first Abkühlpfad 262 "" and the Aufwärmpfad 266 "" and the intermediate wall 264 lying between these "" meandering in the region between the chambers 72 and 92, also to the thermal decoupling of the chambers 72 and 92 to improve. - -

Incidentally, those parts of the fifth embodiment, which are identical to those of the preceding embodiments, provided with the same reference numerals, so that the comments on the above embodiments, reference may be made in full.

In a sixth embodiment, shown in FIGS. 14 and 15, the structural element 64K "" is formed in the same way as in the fourth embodiment according to FIG. 12, so that reference can be made in full to the explanations given here as well as to the preceding embodiments.

In contrast to the fourth embodiment, however, in the sixth embodiment, the expansion member 28 is not integrated into the structure layer 64K, but the structure layer 64K is formed such that the first cooling path 262 is closed by a terminating wall 292.

Further, preferably, the structural layer 64K is disposed adjacent the cover layer 66AO so that it is possible to connect a refrigerant line 302 through the cover layer 66AO to the first cooling path 262, which in turn is then connected to the flow guide path 282 through the cover layer 66AO and into which the expansion ^¬ organ 28 is arranged as an external expansion organ.

The refrigerant line 302 thus makes it possible to avoid the integrated expansion element 28 in a simple manner.

Moreover, the structure of the structural element 64K still has the advantage that a sensor 89 for the external expansion element 88 can also be arranged in a simple manner near the outlet opening 104 of the chamber 92 through the cover layer 66AO or on the cover layer 66AO in the region of the heating path 266 , - -

Further, in this solution, for example, a structural element 64T

provided, which is formed in the same manner as in the fourth embodiment and on a side opposite the external expansion element 88 side of the structural element 64K, but separated by the cover layer 66W is arranged.

Alternatively, it is also possible, a plurality of alternating structural layers 64K, 64T and cover layers 66T

to provide, in which on the top of the cover layer 66AO follows the structural layer 64K, wherein the temperature in the adjacent to the cover layer 66AO structure layer 64K is used by the sensor 89 as representative of all other structural layers 64K representative temperature for the control of the expansion element 88 and the rest the refrigerant line 302 is led to all the structural layers 64K.

Incidentally, in this embodiment, those elements which are identical or functionally identical to those of the preceding elements, provided with the same reference numerals, so that in this respect the comments on the preceding embodiments may be fully incorporated by reference.

In a seventh embodiment based on the fourth embodiment and shown in FIG. 16 to 19, the first cooling path 262 is guided close to the terminal 268, so that one to the

Expansion member 28 leading refrigerant port 312 is located at a small distance adjacent to the port 268 and one of the expansion element 28th

Coming refrigerant port 314 of the chamber 92 can be arranged on a side opposite the intermediate wall 264 side, as shown in FIG. 16 shown. - -

This allows the use of a in Fig. 17 in block construction, whose housing block 324 has a passage 326, whose one terminal opening 328, the terminal 268 cross-over, in particular in alignment with this, is arranged and the other

Connection port 332 is connected to the line leading to the refrigerant compressor 22 line 52, so that the leaving the heating path 266 and flowing to the refrigerant compressor 22 refrigerant flows through the passage 326.

In the passage 326 and thus in the housing block 324, a temperature detecting element 334 is connected, which on the one hand actuated in the housing ^¬ block 324 expansion valve unit 336 actuated and on the other hand by an adjustment unit 338 is adjustable.

The expansion valve unit 336 is provided with an inlet channel 342 provided in the housing block 324, whose connection opening 344 is preferably arranged so as to overlap the refrigerant connection 312, in particular in alignment with the latter.

Furthermore, from the expansion valve unit 336, an outflow channel 346 provided in the housing block 324 leads to a connection opening 348, which is connected to the refrigerant connection 314, for example via a line piece 352.

However, the housing block 324 can also be modified so that the openings 344 and 348 are located on the same side of the housing block 324 and the refrigerant connections 312 and 314 can cross these openings 344, 348. - -

Such a block-type expansion element 322 has the advantage that it can be used favorably on a heat exchanger unit 50 having a plurality of structure layers 64K, since detection of the temperature in the refrigerant flow of the combined connections 268 of all the structure layers 64K and thus of the averaged temperature of the refrigerant all structural layers 64K, so that it is not necessary, as for example in the sixth embodiment, to arrange a sensor for the temperature near the outlet opening 104.

Claims

PATENT APPLICATIONS

A heat exchanger unit for a refrigeration system (10) leading a refrigerant in a refrigerant circuit (20), the heat exchanger unit (50) comprising a heat-emitting heat exchanger (24) having a heat-emitting refrigerant flow path (76) and a heat-receiving flow path (116) second heat transport medium and a heat-absorbing heat exchanger (26) having a heat-absorbing flow path (96) for the refrigerant and a heat-emitting flow path (136) for a first heat exchange medium,

characterized in that the heat exchanger unit (50) is constructed in a stacked construction and has in a stacking direction (62) alternating structural layers (64) and cover layers (66) that the structural layers (64) a course of the flow paths (76, 116, 96, 136 ) define the refrigerant or the heat transport media transversely to the stacking direction (62) and the cover layers cover and limit the flow paths (76, 116, 96, 136) in the stacking direction (62) and at least one of the flow paths in at least one of the structural layers (64K) (76, 96) for the refrigerant and in at least one other of the structural layers (64T) of at least one of the flow paths (116, 136) for one of the heat transport media.

Heat exchanger unit according to claim 1, characterized in that an intended for the refrigerant internal volume of the heat exchanger unit (50) is smaller than one thousand cubic centimeters.

Heat exchanger unit according to claim 1 or 2, characterized in that an intended for the refrigerant internal volume of the heat-emitting heat exchanger (24) is less than five hundred cubic centimeters.

4. Heat exchanger unit according to one of the preceding claims, characterized in that in the heat-emitting heat exchanger (24) of the at least one heat-emitting flow path (76) for the refrigerant and the at least one heat-absorbing flow path (116) for the second heat transport medium overlap each other on opposite sides at least one of the cover layers (66W) run and that the heat transfer through this cover layer (66W) takes place therethrough.

5. Heat exchanger unit according to one of the preceding claims, characterized in that in the heat-absorbing heat exchanger (26) of the at least one heat-absorbing flow path (96) for the refrigerant and the at least one heat-emitting flow path for the first heat transport medium overlapping each other on opposite sides of at least one of Cover layers (66W) run and that the

Heat transfer through this cover layer (66W) is carried out.

6. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-emitting flow path (76) and the heat-absorbing flow path (96) for the refrigerant in each case in the same structural layer (64K).

7. Heat exchanger unit according to one of the preceding claims, characterized in that in one of the structural layers (64K), an inner heat exchanger (260) is provided.

8. Heat exchanger unit according to claim 7, characterized in that the inner heat exchanger (260) in the same structural layer (64K) as the heat-emitting flow path (76) and the heat-absorbing flow path (96) is arranged for the refrigerant.

9. Heat exchanger unit according to one of the preceding claims, characterized in that in the inner heat exchanger (260) coming from the heat-emitting flow path (76) and the expansion element (28) flowing refrigerant before reaching the expansion element (28) heat to the heat-absorbing flow path ( 96) emits coming refrigerant.

10. Heat exchanger unit according to claim 9, characterized in that the inner heat exchanger (260) has a first Abkühlpfad (262) for coming out of the heat-emitting flow path (76) refrigerant and a warm-up path (266) for the from the heat-receiving flow path (96). coming refrigerant on ^¬ points.

11. Heat exchanger unit according to claim 10, characterized in that in the heat exchanger (260) of the first Abkühlpfad (262) and the Aufwärmpfad (266) for the refrigerant by an intermediate wall (264) are separated, through which the heat transfer takes place.

12. Heat exchanger unit according to claim 10 or 11, characterized

in that an additional cooling path (272) adjoins the cooling path (262) of the internal heat exchanger (260).

13. Heat exchanger unit according to claim 12, characterized in that the additional cooling path (272) extends adjacent to the heat-receiving flow path (96).

14. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-emitting flow path (76) and the heat-absorbing flow path (96) for the refrigerant in the same structural layer (64K) are arranged thermally separated from each other.

15. Heat exchanger unit according to claim 14, characterized in that the heat-emitting flow path (76) and the heat-absorbing flow path (96) for the refrigerant are separated by an insulating chamber (100) arranged between them.

16. Heat exchanger unit according to claim 14, characterized in that the heat-emitting flow path (76) and the heat-absorbing flow path (96) for the refrigerant are separated by an inner heat exchanger (260) arranged between them.

17. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-emitting flow path (76) in a chamber (72) of the structural layer (64K) extends.

18. Heat exchanger unit according to claim 17, characterized in that in the chamber (72) flow guide elements (212, 214) are arranged for fixing the heat-emitting flow path.

19. Heat exchanger unit according to claim 18, characterized in that the flow guide elements (212, 214) with the both sides of the structure layer (64K) arranged cover layers (66) are connected.

20. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-absorbing flow path (96) for the refrigerant in a chamber (92) of the structural layer (64K) extends.

21. Heat exchanger unit according to claim 20, characterized in that in the chamber (92) flow guide elements (222, 224) for fixing the heat-absorbing flow path (96) are provided.

22. Heat exchanger unit according to claim 21, characterized in that the flow guidance elements (222, 224) are connected to the cover layers (66) arranged on both sides of the structural layer (64K).

23. Heat exchanger unit according to one of claims 17 to 22, characterized in that the flow paths (76, 96) for the refrigerant receiving chambers (72, 92) in the structural layer (64K) formed by a between these in the structural layer (64K) Insulating chamber (100) are thermally separated.

24. Heat exchanger unit according to one of claims 17 to 22, characterized in that the flow paths (76, 96) receiving chambers (72) are thermally separated from each other by an arranged between these inner heat exchanger (260).

25. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-absorbing flow path (116) for the second heat transport medium and the heat-emitting flow path (136) for the first heat transport medium in the same structural layer (64T) are arranged.

26. Heat exchanger unit according to claim 25, characterized in that the heat-absorbing flow path (116) for the second heat transport medium and the heat-emitting flow path (136) for the first heat transport medium by a in the

Structure layer (64K) arranged intermediate structure (140) are thermally separated from each other.

27. Heat exchanger unit according to claim 26, characterized in that the intermediate structure is formed as an insulating chamber (140).

28. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-absorbing flow path (116) for the second heat transport medium in a chamber (112) of the structure layer (64 T) is arranged.

29. Heat exchanger unit according to claim 28, characterized in that in the chamber (112) flow guide elements (232) are arranged, which predetermine the course of the flow path (116).

30. Heat exchanger unit according to claim 29, characterized in that the flow guiding elements (232) are connected to the cover layers (66) arranged on both sides of the structural layer.

31. Heat exchanger unit according to one of the preceding claims, characterized in that the heat-emitting flow path (136) for the first heat transport medium in a chamber (132) of the structural layer (64 T) is arranged.

32. Heat exchanger unit according to claim 31, characterized in that in the chamber (132) flow guidance elements (242) are provided, which predetermine the course of the flow path (136).

33. Heat exchanger unit according to claim 32, characterized in that the flow guide elements (242) are connected to the cover layers (66) arranged on both sides of the structure layer (64T).

34. Heat exchanger unit according to one of claims 28 to 33, characterized in that the chamber (112) receiving the heat-receiving flow path (116) is thermally insulated from the heat-emitting flow path (136) receiving chamber (132) by a heat exchange suppressing intermediate structure (140). is thermally separated.

35. Heat exchanger unit according to one of the preceding claims, characterized in that the expansion element (28) is an expansion element (88) arranged outside the structural layer (64K).

36. Heat exchanger unit according to one of the preceding claims, characterized in that the expansion member (28) on the uppermost cover layer (66AO) of the heat exchanger unit (50) is arranged.

37. Heat exchanger unit according to one of the preceding claims, characterized in that the expansion element (28) has a housing (329) with a passage (326) through which the refrigerant compressor (22) guided through the refrigerant and in which a temperature sensing element (32) 324) which controls an expansion valve unit (336).

38. Heat exchanger unit according to one of the preceding claims, characterized in that the housing (324) on the uppermost cover layer (66AO) is arranged and that at least one connection ^¬ opening (328, 344) of the housing (324) has a connection of the heat exchanger unit (50 ) is arranged across.

39. Heat exchanger unit according to one of claims 1 to 34, characterized in that the expansion member (28) for the refrigerant in the structure layer (64K) is integrated.

40. Heat exchanger unit according to one of the preceding claims, characterized in that the structural layers (64) and the cover layers (66) are made of metal.

41. Heat exchanger unit according to one of the preceding claims, characterized in that the structural layers (64) and the cover layers (66) are materially interconnected.

42. Heat exchanger unit according to claim 39, characterized in that the structural layer (64) and the cover layers (66) are connected to one another by soldering.

43. Heat exchanger unit according to one of claims 1 to 41, characterized in that the structural layers (64) and the cover layers (66) are joined together by gluing.

44. refrigeration system comprising a refrigerant circuit (20) in which a heat exchanger unit (50) is arranged, which is also arranged in a first heat transport circuit (30) in which a first heat transport medium circulates, and in a second heat transport circuit (40) is arranged in which circulates a second heat transport medium, wherein both the first heat transport circuit (30) and the second heat transport circuit (40) by means of the heat transfer media perform a phase transition heat transfer to each arranged in these heat exchangers (32, 42) and wherein the heat exchanger unit (50) according to one of preceding claims is formed.

45. Refrigeration system according to claim 44, characterized in that the first heat transport medium and the second heat transport medium are based on water.

46. Refrigeration system according to one of claims 44 or 45, characterized in that the refrigerant circuit (20) with the heat exchanger unit (50) and a refrigerant compressor (22) forms a modular unit and in that the module unit in the first heat transport circuit (30) and / or the second heat transport circuit (40) is detachably einbindbar formed.

47. Refrigeration system according to claim 46, characterized in that the

Module unit, the heat exchanger unit (50) the refrigerant compressor (22) and the expansion device (28), which are interconnected to form the module unit.

48. Refrigeration system according to one of claims 44 to 47, characterized in that the heat exchanger unit (50) via detachable and in particular a loss of the respective heat transport medium preventing connecting elements (252, 254, 256, 258) with the first (30) and / or the second (40) heat transfer circuit is connected.

49. Refrigeration system according to one of claims 44 to 48, characterized in that the refrigerant circuit (20) and the first heat transport circuit (30) on a space to be cooled (12) having stationary object (14) are arranged.

50. Refrigeration system according to one of claims 44 to 48, characterized in that it is designed for use in the mobile sector.

51. Refrigeration system according to one of claims 44 to 50, characterized in that it is designed for use in temperature-sensitive systems or goods receiving spaces or containers.