Refrigeration system with a heat exchanger module having a subcooling section and a refrigerant storage device for cooling operation and heat pump operation, and motor vehicle with such a refrigeration system

Abstract

The invention relates to a refrigeration system (10) for a motor vehicle (100) that is at least partially driven electrically or by an internal combustion engine, comprising a refrigerant compressor (12); a heat exchanger module (14) with a first heat exchanger surface (16), a second heat exchanger surface (18), in particular a subcooling section, and a refrigerant reservoir (20) connected to the two heat exchanger surfaces (16, 18); a first heat exchanger (22), in particular an evaporator, for conditioning interior air; a second heat exchanger (24; 28), wherein the refrigeration system (10) is configured to be operated in a cooling mode and at least one heat pump mode, including the heat exchanger module (14) and / or the second heat exchanger (24).It is provided that the refrigerant reservoir (20) assigned to the heat exchanger module (14) is fluidically integrated into the refrigeration system (10) in such a way that it can be used as a high-pressure side refrigerant reservoir (20) and / or as a low-pressure side refrigerant reservoir (20). Furthermore, a motor vehicle (100) with such a refrigeration system is described.

Description

[0001] The invention relates to a refrigeration system for a motor vehicle that is at least partially powered electrically or by an internal combustion engine, comprising a refrigerant compressor; a heat exchanger module with a first heat exchanger surface, a second heat exchanger surface, in particular a subcooling section, and a refrigerant reservoir connected to the two heat exchanger surfaces; a first heat exchanger, in particular an evaporator, for conditioning interior air; a second heat exchanger, in particular a chiller, which is arranged fluidically parallel to the first heat exchanger, for conditioning a cooling medium that circulates in a coolant circuit for conditioning at least one electrical component of the motor vehicle, wherein the refrigeration system is configured to be operated in a cooling mode and at least one heat pump mode with the inclusion of the heat exchanger module and / or the second heat exchanger.

[0002] Such refrigeration systems are used primarily in motor vehicles, although the heat exchanger module has so far only been used as a condenser for subcritical refrigerants, particularly due to its combination with the refrigerant storage tank and the subcooling section (second heat exchanger surface). In this context, it should be noted that the subcooling section can also be referred to as a subcooling section.

[0003] The state of the art refers, for example, to refrigeration systems known from DE 10 2012 109 038 A1 and DE 10 2013 110 224 A1.

[0004] The object underlying the invention is to provide a refrigeration system with a refrigerant storage unit and subcooling section on the heat exchanger module, so that several heat sources can be integrated into a heat pump operation by means of the refrigeration system.

[0005] This object is achieved by a refrigeration system and a motor vehicle having the features of the respective independent patent claim. Advantageous embodiments with useful further developments are specified in the dependent patent claims.

[0006] The invention therefore proposes a refrigeration system for a motor vehicle that is at least partially powered by electricity or an internal combustion engine, comprising a refrigerant compressor; a heat exchanger module with a first heat exchanger surface, a second heat exchanger surface, in particular a subcooling section, and a refrigerant reservoir connected to the two heat exchanger surfaces; a first heat exchanger, in particular an evaporator, for conditioning interior air; and a second heat exchanger. The refrigeration system is configured to operate in a cooling mode and at least one heat pump mode, including the heat exchanger module and / or the second heat exchanger. The refrigerant reservoir associated with the heat exchanger module is fluidically integrated into the refrigeration system in such a way that it can be used as a high-pressure refrigerant reservoir and / or as a low-pressure refrigerant reservoir.

[0007] This makes it possible to provide the refrigeration system with heat exchanger module with subcooling section with a dual function, in particular by integrating the refrigerant storage provided on the heat exchanger module.

[0008] The refrigeration system may have a third heat exchanger.

[0009] In the refrigeration system, the second heat exchanger can be a chiller arranged fluidically parallel to the first heat exchanger for conditioning a cooling medium circulating in a coolant circuit for conditioning at least one electrical component of the motor vehicle, or the second heat exchanger can be a heating register configured to heat interior air.

[0010] Of the two alternative second heat exchangers mentioned here, i.e. chiller and heating register, the other can form the third heat exchanger.

[0011] The third heat exchanger serves primarily to heat the interior air. Typically, the third heat exchanger is arranged in an air flow path adjacent to the first heat exchanger (evaporator), such that the air to be heated can be dehumidified beforehand by the first heat exchanger (evaporator).

[0012] Alternatively, the third heat exchanger can also be designed as an indirect heat exchanger, conditioning a cabin supply air flow. Instead of direct heat transfer into the supply air flow, the heat is transferred, for example, into a fluid flow, which in turn feeds a heating heat exchanger.

[0013] In the refrigeration system, the refrigerant storage tank can be used as a high-pressure storage tank in the cooling mode, with liquid refrigerant flowing from the refrigerant storage tank to the second heat exchanger surface of the heat exchanger module, and the refrigerant storage tank can be used as a low-pressure storage tank in a heat pump mode, with gaseous refrigerant flowing from the refrigerant storage tank to the refrigerant compressor of the refrigeration system.

[0014] This allows the refrigeration system's heat exchanger module to be used flexibly, providing a functional and usable refrigerant storage unit in every operating mode. The same or identical refrigerant storage unit can be used for both operating modes.

[0015] In the refrigeration system, a low-pressure line section can be connected to the refrigerant storage of the heat exchanger module, extending from the refrigerant storage to a first branch upstream of the refrigerant compressor. This ensures that vaporous or two-phase refrigerant with a high gas phase fraction can be supplied to the refrigerant compressor from the refrigerant storage, which is assigned to or connected to the heat exchanger module.

[0016] At least one valve device, in particular a shut-off valve and / or a check valve, can be arranged in the low-pressure line section. This ensures that the refrigerant circulates properly in the refrigeration system during heat pump operation.

[0017] In this context, a second branch can be provided downstream of the refrigerant compressor and upstream of the third heat exchanger, and a third branch can be provided on the low-pressure side line section, with a compensating line section with a shut-off device arranged between the second branch and the third branch. The compensating line section serves, in particular, to extract refrigerant from the line section with the third heat exchanger (heating register) as needed when the third heat exchanger or its line branch is not actively flowing with refrigerant. This operating scenario occurs particularly in interior cooling mode or AC operation.

[0018] In addition to the refrigerant storage unit on the heat exchanger module, the refrigeration system can have a further refrigerant collector arranged on the low-pressure side downstream of the first heat exchanger and the second heat exchanger. This enables optimized use of the refrigerant storage unit on the heat exchanger module and the low-pressure side refrigerant collector depending on a set operating state of the refrigeration system, in particular cooling mode (AC mode), (air) and / or (water) heat pump mode, including the heat exchanger module and / or the second heat exchanger (chiller).

[0019] In the refrigeration system, the high-pressure side refrigerant storage of the heat exchanger module can be used in cooling mode and the further, low-pressure side refrigerant collector can be used in heat pump mode with the integration of the second heat exchanger and / or the heat exchanger module, wherein a fluid line is arranged between the second heat exchanger surface and the first heat exchanger surface, which fluid line serves as a bypass line in heat pump mode to guide refrigerant from the second heat exchanger surface to the first heat exchanger surface past the (integrated) refrigerant storage.

[0020] A motor vehicle with at least partially electric or combustion engine drive can be equipped with a refrigeration system as described above.

[0021] Further advantages and details of the invention will become apparent from the following description of embodiments with reference to the figures. Fig. 1 a simplified and schematic view of an example of a refrigeration system with a heat exchanger module having a subcooling section and a refrigerant storage; Fig. 2 a simplified and schematic view of another example of a refrigeration system with a heat exchanger module having a subcooling section and a refrigerant storage unit; Fig. 3 a simplified and schematic view of another example of a refrigeration system with a heat exchanger module having a subcooling section and a refrigerant storage unit; Fig. 4 a simplified and schematic view of another example of a refrigeration system with a heat exchanger module having a subcooling section and a refrigerant storage

[0022] In Fig. Figure 1 shows a simplified and schematic example of a refrigeration system 10. The refrigeration system comprises a refrigerant compressor 12 and a heat exchanger module 14. The heat exchanger module comprises a first heat exchanger surface 16, a second heat exchanger surface 18, and a refrigerant reservoir 20 connected to the two heat exchanger surfaces 16, 18.

[0023] The refrigeration system 10 further comprises a first heat exchanger 22, in particular an evaporator, for conditioning or cooling / dehumidifying interior air for a motor vehicle.

[0024] In the example shown, the refrigeration system 10 has a second heat exchanger 24, which is designed here as a so-called heating register for conditioning or heating the interior supply air for a motor vehicle.

[0025] In this example, the heat exchanger module 14 is designed as an external heat exchanger which is exposed to ambient air.

[0026] During cooling operation of the refrigeration system 10, the refrigerant circulates from the refrigerant compressor 12 according to the double arrows shown. When the valve device A4 is open, the refrigerant reaches the heat exchanger module 14, in particular its first heat transfer surface 16, which serves as a condenser for subcritical refrigerant in this operating mode.

[0027] The refrigerant then flows into the refrigerant reservoir 20, which serves as the high-pressure side refrigerant reservoir in this operating mode. From the refrigerant reservoir 20, the refrigerant flows into the second heat exchanger surface 18, which serves as the subcooling section.

[0028] The refrigerant is then expanded into the first heat exchanger 22 (evaporator) by means of the expansion valve AE1 with the shut-off valve A2 open. From there, the refrigerant returns to the refrigerant compressor 12. An internal heat exchanger (not shown) can optionally be provided in the refrigeration system 10.

[0029] To prevent the refrigerant from entering the second heat exchanger 24 (heating register) during cooling operation, a valve device A3 downstream of the refrigerant compressor 12 is closed. Furthermore, a further valve R2 is arranged between the expansion valve AE1 and the second heat exchanger 24 in the exemplary embodiment as a check valve.

[0030] In heat pump operation, in which the heat exchanger module 12 is used as an air-source heat pump evaporator, the refrigerant circulates from the refrigerant compressor 12 according to the elongated individual arrows shown. When the valve device A3 is open, the refrigerant reaches the second heat exchanger 24 (heating register), which serves as a condenser to heat the interior air supply for the vehicle.

[0031] The refrigerant is then expanded into the heat exchanger module 14 by means of the expansion valve AE1 with the shut-off valve A2 closed, in particular in parallel into the first heat exchanger surface 16 and the second heat exchanger surface 18. The two heat exchanger surfaces 16, 18 function as evaporators and extract heat from the ambient air (air heat pump).

[0032] From the two heat exchanger surfaces 16, 18, the refrigerant enters the refrigerant storage tank 20 in gaseous form. In this operating mode, the refrigerant storage tank 20 serves as a low-pressure side refrigerant storage tank.

[0033] From the refrigerant storage 20, the refrigerant returns to the refrigerant compressor 12. For this purpose, a low-pressure side line section 21 is connected to the refrigerant storage 20 of the heat exchanger module 18, which extends from the refrigerant storage 20 to a branch Ab7 upstream of the refrigerant compressor 12.

[0034] To prevent the refrigerant from entering the first heat exchanger 22 (evaporator) during (air) heat pump operation, the valve device A4 downstream of the refrigerant compressor 12 is closed. Furthermore, the shut-off valve device A2 is closed.

[0035] In other words, the refrigeration system 10 is configured to be operated in a cooling mode (refrigerant flow direction corresponding to double arrows) and at least one (air) heat pump mode (refrigerant flow direction corresponding to single arrows) with the inclusion of the heat exchanger module 14 and the second heat exchanger 24.

[0036] The refrigerant storage tank 20 assigned to the heat exchanger module 14 is fluidically connected in the refrigeration system 10 in such a way that, depending on the operating mode, it can be used as a high-pressure side refrigerant storage tank 20 and as a low-pressure side refrigerant storage tank 20.

[0037] As can be seen from the selected illustration, the expansion valve AE1 is configured to expand the refrigerant toward the respective first heat exchanger 22 (evaporator) or the heat exchanger module 14, both in cooling mode and in (air) heat pump mode. In other words, the expansion valve AE1 is bidirectional.

[0038] It should be noted that the configuration shown here with an expansion valve AE1, the shut-off valve A2, and the check valve R2 is purely exemplary. For example, it is also conceivable that the expansion valve AE1 only expands refrigerant in the direction of the heat exchanger module 14 and can simply be fully opened in the counterflow direction. In such a case, an expansion valve could be provided only for the first heat exchanger 22 (evaporator) instead of the shut-off valve A2.

[0039] It should also be mentioned that switching the shut-off valve A2 to an expansion device (not shown) of the system can enable reheat operation, but only up to an evaporation pressure level that excludes air-side icing of the interior evaporator 22 due to separated condensate.

[0040] Fig. 2 shows another example of a refrigeration system 10 with a refrigerant compressor 12 and a heat exchanger module 14. The refrigeration system 10 shown here has additional components compared to the refrigeration system 10 of Fig. 1, which is described in more detail below.

[0041] The refrigeration system 10 has the already Fig. 1, which is designed as an evaporator. Furthermore, the refrigeration system 10 has the second heat exchanger 24, which is designed as a heating register.

[0042] The refrigeration system 10 has a third heat exchanger 28, which can also be referred to as a chiller. The third heat exchanger 28 serves, in particular, to condition a cooling medium that circulates in a coolant circuit 28.2 for conditioning at least one electrical component (not shown here) of the motor vehicle. The third heat exchanger 28 can act either as an evaporator if heat is to be extracted from the cooling medium, or as a condenser if heat is to be transferred to the cooling medium.

[0043] As from the Fig. 2, the first heat exchanger 22 (evaporator) and the third heat exchanger 28 (chiller) are arranged parallel to each other in terms of flow.

[0044] During cooling operation of the refrigeration system 10, the refrigerant circulates from the refrigerant compressor 12 according to the double arrows shown. When the valve device A4 is open, the refrigerant reaches the heat exchanger module 14, in particular its first heat transfer surface 16, which serves as a condenser for subcritical refrigerant in this operating mode.

[0045] The refrigerant then flows into the refrigerant reservoir 20, which serves as the high-pressure side refrigerant reservoir in this operating mode. From the refrigerant reservoir 20, the refrigerant flows into the second heat exchanger surface 18, which serves as the subcooling section.

[0046] The refrigerant is then expanded into the first heat exchanger 22 (evaporator) by means of the expansion valve AE2 with the shut-off valve A1 closed. From there, the refrigerant returns to the refrigerant compressor 12.

[0047] In cooling mode, the refrigerant can also be expanded into the third heat exchanger 28 (chiller) via the expansion valve AE1. From there, the refrigerant returns to the refrigerant compressor 12 in cooling mode with the shut-off valve A5 closed and the shut-off valve A6 open.

[0048] To prevent the refrigerant from entering the second heat exchanger 24 (heating register) during cooling operation, a valve device A3 is closed downstream of the refrigerant compressor 12. Furthermore, the shut-off valve A1 is arranged between the expansion valve AE2 and the second heat exchanger 24.

[0049] In heat pump operation, in which the heat exchanger module 12 is used as an air-source heat pump, the refrigerant circulates from the refrigerant compressor 12 according to the elongated individual arrows shown. When the valve device A3 is open, the refrigerant reaches the second heat exchanger 24 (heating register), which serves as a condenser to heat the interior air for the vehicle.

[0050] The refrigerant is then expanded into the heat exchanger module 14, particularly into the first heat exchanger surface 16, by means of the expansion valve AE4 with the shut-off valve device A1 closed. The first heat exchanger surface 16 serves as an evaporator and extracts heat from the ambient air (air heat pump).

[0051] From the heat exchanger surface 16, the refrigerant enters the refrigerant storage 20 in gaseous form. In this operating mode, the refrigerant storage 20 serves as a low-pressure side refrigerant storage.

[0052] From the refrigerant storage 20, the refrigerant returns to the refrigerant compressor 12 via an open shut-off device A7 and the branch Ab7, flowing through the low-pressure side line section 21.

[0053] To prevent the refrigerant from entering the first heat exchanger 22 (evaporator) during (air) heat pump operation, the valve device A4 downstream of the refrigerant compressor 12 is closed. Furthermore, the shut-off valve device A1 is closed. Additionally, the expansion element AE2 can be closed, and furthermore, a possible downstream backflow of refrigerant into the evaporator 22 can be prevented by the check valve R1 indicated by the dashed line.

[0054] Alternatively or additionally, it is also possible for the refrigerant downstream of the second heat exchanger 24 (heating register) to be expanded by means of the expansion valve AE3 to the heat exchanger module 14, in particular into the second heat exchanger surface 18, with the shut-off valve A1 open and the expansion valves AE1, AE2 closed. This flow path is not shown again within the heat exchanger module 14, but is based on the representation of the Fig. 1, whereby the flow through the heat exchanger module 14 is also similar to that in Fig. 1 can be represented by adjustments in the cable routing.

[0055] If the third heat exchanger 28 (chiller) is used as a water heat pump evaporator with the refrigeration system 10, the refrigerant flows downstream from the second heat exchanger 24 (heating register) via the open shut-off valve A1 with the expansion valves AE3 and AE2 closed, but the expansion valve AE1 open, into the third heat exchanger 28. The refrigerant absorbing heat there is then led to the refrigerant storage 20 of the heat exchanger module 14 with the shut-off valve A8 open and the shut-off valve A6 closed.

[0056] From the refrigerant storage tank 20, the refrigerant returns to the refrigerant compressor 12 via the opened shut-off device A7 and the branch Ab7.

[0057] In other words, the refrigeration system 10 is also Fig. 2 is designed to be operated in a cooling mode (refrigerant flow direction corresponding to double arrows) and at least one (air) / (water) heat pump mode (refrigerant flow direction corresponding to single arrows) with the inclusion of the heat exchanger module 14 and the second heat exchanger 24 and / or third heat exchanger 28.

[0058] The refrigerant storage tank 20 assigned to the heat exchanger module 14 is fluidically connected in the refrigeration system 10 in such a way that, depending on the operating mode, it can be used as a high-pressure side refrigerant storage tank 20 and as a low-pressure side refrigerant storage tank 20.

[0059] In the refrigeration system of the Fig. 2, a branch Ab5 is provided downstream of the refrigerant compressor 12 and upstream of the third heat exchanger 24. A branch Ab6 is provided on the low-pressure side line section 21, with a compensating line section 23 with a shut-off device A5 being arranged between the branch Ab5 and the branch Ab6.

[0060] For the sake of completeness, it should be noted that the refrigeration system 10 may optionally have an internal heat exchanger 30.

[0061] Fig. 3 shows another example of a refrigeration system 10 which is similar to the refrigeration system 10 of Fig. 2. Therefore, to avoid repetition, the above description is Fig. 2.

[0062] The refrigeration system 10 of the Fig. 3 comprises, in addition to the refrigerant storage 20 of the heat exchanger module 14, a refrigerant collector 32 arranged on the low-pressure side.

[0063] In a cooling operation of the refrigeration system 10, the refrigerant storage 20 of the heat exchanger module 14 is used as a high-pressure side refrigerant storage, wherein the low-pressure side refrigerant collector 32 is, so to speak, run empty or does not store a larger amount of refrigerant.

[0064] In an air heat pump operation, in which the heat exchanger module 14 with its heat exchanger surfaces 16, 18 operates as an evaporator, the refrigerant storage 20 serves as a low-pressure side refrigerant storage.

[0065] The additional low-pressure side refrigerant collector 32 is used in particular when the third heat exchanger 28 is operated as a water heat pump evaporator.

[0066] Fig. 4 shows another example of a refrigeration system 10 which is similar to the refrigeration system 10 of Fig. 2 or the Fig. 3. Therefore, to avoid repetition, the above description is Fig. 2 and 3 respectively.

[0067] The refrigeration system 10 of the Fig. 3 includes, in addition to the refrigerant storage 20 of the heat exchanger module 14, also the refrigerant collector 32 arranged on the low-pressure side.

[0068] In a cooling operation of the refrigeration system 10, the refrigerant storage 20 of the heat exchanger module 14 is used as a high-pressure side refrigerant storage, wherein the low-pressure side refrigerant collector 32 is, so to speak, run empty or does not store a larger amount of refrigerant.

[0069] In air-source heat pump operation, in which the heat exchanger module 14 with its heat exchanger surfaces 16, 18 operates as an evaporator, the refrigerant storage unit 20 remains unused in its actual function as a refrigerant storage unit. In this embodiment, the heat exchanger module 14 is constructed such that a fluid line 34 (shown here only by a vertical arrow) is arranged between the second heat exchanger surface 18 and the first heat exchanger surface 16. This fluid line serves as a bypass line during heat pump operation to conduct refrigerant from the second heat exchanger surface 18 to the first heat exchanger surface 16, bypassing the refrigerant storage unit 20.

[0070] In air-source heat pump operation, the refrigerant is routed downstream from the third heat exchanger 24 (heating register) via the open shut-off valve A1 and the expansion valve AE3. After passing through the heat exchanger module 14, the refrigerant flows via the open shut-off valve A7, branch Ab7, to the low-pressure side refrigerant receiver 32.

[0071] The additional low-pressure side refrigerant collector 32 is used in particular when the heat exchanger module 14 is operated as an air heat pump evaporator and the third heat exchanger 28 is operated as a water heat pump evaporator.

[0072] As can be seen from the Fig. As can be seen in Figures 1 to 4, the respective refrigeration systems 10 have a heat exchanger module 14 that can be used both in cooling mode and in (air) heat pump mode. Further details on the design of such heat exchanger modules 14 are described in the German patent application filed concurrently by the applicant entitled "Heat exchanger module with subcooling section and refrigerant storage for cooling mode and heat pump mode, as well as refrigeration system with such a heat exchanger module."

[0073] Finally, it should be noted that in the Fig. 1 purely by way of example and also representative of all other figures, a motor vehicle 100 is shown as a dashed rectangle in which the refrigeration system 10 is arranged or installed. Each of the refrigeration systems 10 of the Fig.2 to 4 can also be arranged in a motor vehicle 100. The motor vehicle preferably has a fully electric drive, although an internal combustion engine drive or a hybrid drive are also possible. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2012 109 038 A1

[0003] DE 10 2013 110 224 A1

[0003]

Claims

[1] Refrigeration system (10) for a motor vehicle (100) driven at least partially electrically or by an internal combustion engine, comprising a refrigerant compressor (12); a heat exchanger module (14) with a first heat exchanger surface (16), a second heat exchanger surface (18), in particular a subcooling section, and a refrigerant storage device (20) connected to the two heat exchanger surfaces (16, 18); a first heat exchanger (22), in particular an evaporator, for conditioning interior air; a second heat exchanger (24; 28), wherein the refrigeration system (10) is designed to be operated in a cooling mode and at least one heat pump mode including the heat exchanger module (14) and / or the second heat exchanger (24), characterized bythat the refrigerant storage (20) assigned to the heat exchanger module (14) is fluidically integrated into the refrigeration system (10) in such a way that it can be used as a high-pressure side refrigerant storage (20) and / or as a low-pressure side refrigerant storage (20). [2] Refrigeration system (10) according to claim 1, characterized by that it has a third heat exchanger (24; 28). [3] Refrigeration system (10) according to claim 1 or 2, characterized by that the second heat exchanger is a chiller (28) which is arranged fluidically parallel to the first heat exchanger (22) for conditioning a cooling medium which circulates in a coolant circuit (28.2) for conditioning at least one electrical component of the motor vehicle, or that the second heat exchanger is a heating register (24) which is designed to heat interior air. [4] Refrigeration system (10) according to one of the preceding claims, characterized bythat the refrigerant accumulator (20) can be used as a high-pressure accumulator in the cooling mode, with liquid refrigerant passing from the refrigerant accumulator (20) to the second heat exchanger surface (18) of the heat exchanger module (14), and that the refrigerant accumulator (20) can be used as a low-pressure accumulator in a heat pump mode, with gaseous refrigerant passing from the refrigerant accumulator (20) to the refrigerant compressor (12) of the refrigeration system (10). [5] Refrigeration system (10) according to one of the preceding claims, characterized by that a low-pressure side line section (21) is connected to the refrigerant accumulator (20) of the heat exchanger module (14), which extends from the refrigerant accumulator (20) to a first branch (Ab7) upstream of the refrigerant compressor (12). [6] Refrigeration system (10) according to claim 5, characterized bythat at least one valve device (A7) is arranged in the low-pressure side line section (21), in particular a shut-off valve and / or a check valve. [7] Refrigeration system (10) according to claim 5 or 6, characterized by that a second branch (Ab5) is provided downstream of the refrigerant compressor (12) and upstream of the third heat exchanger (24), and a third branch (Ab6) is provided on the low-pressure side line section (21), wherein a compensating line section with a shut-off device (A5) is arranged between the second branch (Ab5) and the third branch (Ab6). [8] Refrigeration system (10) according to one of the preceding claims, characterized by in that, in addition to the refrigerant reservoir (20) on the heat exchanger module (14), it has a further refrigerant collector (32) which is arranged on the low-pressure side downstream of the first heat exchanger (22) and of the second heat exchanger (28). [9] Refrigeration system (10) according to claim 8, characterized by that in the cooling mode the high-pressure side refrigerant accumulator (20) of the heat exchanger module (14) is used and that in a heat pump mode with the integration of the second heat exchanger (28) and / or the heat exchanger module (14), the further, low-pressure side refrigerant collector (32) is used, wherein between the second heat exchanger surface (18) and the first heat exchanger surface (16) a fluid line (34) is arranged, which serves as a bypass line in the heat pump mode in order to guide refrigerant from the second heat exchanger surface (18) to the first heat exchanger surface (16) past the refrigerant accumulator (20). [10] Motor vehicle (100) with at least partially electric or internal combustion engine drive with a refrigeration system (10) according to one of the preceding claims.

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