WO2014086442A1

WO2014086442A1 - Vehicle air conditioning unit

Info

Publication number: WO2014086442A1
Application number: PCT/EP2013/003182
Authority: WO
Inventors: Klaus Harm; Oliver Wagner
Original assignee: Daimler Ag
Priority date: 2012-12-05
Filing date: 2013-10-22
Publication date: 2014-06-12
Also published as: DE102012023823A1

Abstract

The present invention relates to a vehicle air conditioning unit (1), particularly for a hybrid vehicle or electric vehicle, with a refrigerant circuit (2) in which a refrigerant circulates and which has a refrigerant compressor (4) and a condensing device (5), and with a coolant circuit (3) in which a coolant circulates and which has a coolant pump (7) and a heat exchanger (9) for heating a stream of heating air (10), wherein the refrigerant circuit (2) and the coolant circuit (3) are thermally coupled to one another via the condensing device (5). Improved efficiency results if the condensing device (5) has a desuperheater (11), a condenser (12) and a subcooler (13), if the condenser (12) is arranged downstream of the desuperheater (11) and upstream of the subcooler (13) with regard to a flow direction (6) of the refrigerant in the refrigerant circuit (2), and if the coolant circuit (3) is thermally coupled to the desuperheater (11), to the condenser (12) and to the subcooler (13).

Description

Vehicle air conditioning

The present invention relates to a vehicle air conditioning system having the features of the preamble of claim 1.

In vehicles, it is often necessary to cool aggregates of the vehicle which become warm during operation. Further, depending on the ambient temperature of the vehicle, it is desired to cool or heat a passenger compartment of the vehicle. The heating, that is, the supply of heat and cooling, so the removal of heat can be generally referred to as air conditioning in the demand-dependent heat is added or removed. In order to improve the energy efficiency of the vehicle, an attempt is made to perform the air conditioning as efficiently as possible. This applies both to motor vehicles, which have an internal combustion engine as the main drive unit, as well as for vehicles with electric drive. For electric vehicles and hybrid vehicles, efficient air conditioning is of greater importance, since as a rule no internal combustion engine with excess heat or excess power is available. The already limited range of electric vehicles or hybrid vehicles in the electric drive mode is significantly reduced by additional consumers of electrical energy.

In order to improve the efficiency of the vehicle air conditioning, in particular in electric vehicles and hybrid vehicles, it is known to use a refrigerant circuit, that is, a heat pump cycle, which can be shortened referred to as a heat pump. Usually, a heat pump cycle, ie a refrigerant circuit, includes a

Refrigerant compressor in which a gaseous refrigerant is compressed to increase the temperature therein. In a subsequent condenser, the heat introduced into the refrigerant by means of the refrigerant compressor can be withdrawn from the refrigerant by condensing the refrigerant. The liquid refrigerant can now be evaporated again with the help of an evaporator, whereby the refrigerant Heat is supplied. The vaporized refrigerant then returns to the refrigerant compressor. With the aid of such a heat pump, the heat can be transferred by means of the evaporator from a first system to the refrigerant of the refrigerant circuit. In the refrigerant circuit with the help of the refrigerant compressor, this heat can be brought to a higher temperature level with relatively little effort. The heat of the refrigerant can then be transferred to a second system via the condenser. Since with the help of the heat pump, the temperature level between the first system and the second system can be changed, it is ultimately possible, for. B. supply waste heat from a first system in a second system to a higher temperature. Compared to the heat obtained in the second system, the cost of the refrigerant compressor is low. The coefficient called CoP, as the ratio of heat received in the second system, to

used mechanical work of the refrigerant compressor, reaches values greater than one.

From DE 101 41 389 B4 an air conditioning system for a motor vehicle is known which comprises a refrigerant circuit and a coolant circuit. In the refrigerant circuit circulates a refrigerant. The refrigerant circuit has a refrigerant compressor and a

Condensation on. In the coolant circuit circulates a coolant. Of the

Coolant circuit has a coolant pump and a heating heat exchanger for heating a Heizluftstroms. Furthermore, the refrigerant circuit and the coolant circuit are thermally coupled to one another via the condensation device. In other words, the refrigerant circuit or the refrigerant can transfer heat to the coolant circuit or to the coolant via the condensation device. In the known

Vehicle air conditioning system is the condensation device as one piece

Condenser configured.

From DE 10 2008 043 823 B4, a heat pump cycle is known for a building heating, which conventionally has a refrigerant compressor, a condensation device and an evaporator. In this refrigerant circuit is the

Condenser divided into three components, namely a desuperheater, a condenser and a subcooler. With respect to the flow direction of the refrigerant, the condenser is downstream of the desuperheater and upstream of the subcooler in the

Refrigerant circuit arranged. In the known heat pump cycle, a heat storage of the building heating is thermally coupled via a first transmission circuit with the desuperheater and via a separate second transmission circuit with the

Capacitor thermally coupled. A third separate transmission circle is according to Art a series circuit with the subcooler and the evaporator thermally coupled. In this third transmission circuit, a heat source heat exchanger is also arranged to the respective heat source, for. B. ambient air to be able to withdraw energy.

From DE 38 34 387 C2, a further vehicle air conditioning system is known, which has a refrigerant circuit and a coolant circuit. At this

Vehicle air conditioning system, the two circuits are thermally coupled to one another via an evaporator of the refrigerant circuit.

The present invention deals with the problem for a

Vehicle air conditioning system to provide an improved embodiment, which is characterized in particular by an increased energy efficiency.

This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.

The invention is based on the general idea of subdividing the condensation device into three components, namely a desuperheater, a condenser and a subcooler, wherein the coolant circuit is thermally coupled to all three components. Due to the subdivision of the condensation device in the desuperheater, the condenser and the subcooler, the three components can each be optimally for the volume flows occurring in the respective application and

Optimize temperatures. Within the individual components, it is also easier to adapt to the respectively occurring states of aggregation. For example, the desuperheater can be optimized so that as much sensitive heat as possible can be removed from the gaseous refrigerant. In particular, a refrigeration circuit side piping is on the comparatively large

Volume flow of the gaseous refrigerant adjusted. In contrast, the capacitor may be optimized for a latent heat output. As a result, the condensation takes place inside the capacitor. The cooling circuit side piping can take into account a reduction of the volume flow of the incoming gaseous refrigerant to the exiting liquid refrigerant. Finally, the subcooler can be optimized for delivering sensible heat from the liquid refrigerant. In particular, the cooling-circuit side piping is adapted to the comparatively small volume flows of the liquid refrigerant. Of particular importance is that the cooling circuit is thermally coupled both to the heater and the condenser and to the subcooler. As a result, heat can be supplied to the coolant in three stages, as a result of which the heat transfer between the two circuits via the condensation device can be realized particularly efficiently.

According to an advantageous embodiment, an interconnection for the fluidic coupling of the coolant circuit with the condensation device between a Heizschaltstellung and a cooling switching position can be switched. The two

Switch positions differ by different fluidic couplings of the coolant circuit with the desuperheater, the condenser and the subcooler. In this way, can be set for the heat transfer to the coolant circuit at least two different operating conditions, namely with the Heizschaltstellung one hand, and with the cooling switch position on the other. In this way, the vehicle air conditioning system presented here for these two different

Operating conditions are optimized.

In this case, the term "interconnection" encompasses the line elements leading to the respective fluidic coupling, such as lines, tubes and channels.

According to an advantageous development, the interconnection can lead the coolant circuit in the Heizschaltstellung successively through the subcooler, the condenser and the desuperheater, so that in the heating operation of the air conditioning system of the subcooler, the condenser and the desuperheater are flowed through by the coolant in succession.

With regard to the coolant circuit thus the components of the

Condenser arranged in the Heizschaltstellung in series. In this case, the heat from the refrigerant circuit in three separate and successive stages can be transferred to the coolant circuit, whereby an intense heat transfer in conjunction with a relatively high end temperature for the coolant can be achieved. The Heizschaltstellung is thus particularly suitable for a heating operation in which in a further heat exchanger by means of the coolant, a Heizluftstrom can be heated to a relatively high temperature. With the help of the heating air flow, in particular a passenger compartment of the vehicle can be heated. According to an advantageous development of the condenser with respect to a flow direction of the coolant in the coolant circuit upstream of the desuperheater and downstream of the subcooler may be arranged in the Heizschaltstellung. This will be a

Flow through the three components of the condensation device after the

Countercurrent realized, whereby for the coolant a particularly high

End temperature can be achieved.

In another development, the interconnection can lead the coolant circuit in the cooling switch position parallel through the subcooler, the condenser and the desuperheater, so that in the cooling mode of the air conditioning system of the subcooler, the

Condenser and the desuperheater are flowed through in parallel by the coolant. By this cooling switching position, the parallel arrangement of the condensation device in

Coolant circuit causes, can be set a particularly high volume flow in the coolant, whereby an increased amount of heat can be dissipated through the coolant circuit. As a result, a corresponding amount of heat can be withdrawn with the aid of the refrigerant circuit of a heat source to be cooled in cooling operation in order to effect efficient cooling there. The heat source may be, for example, a main battery of an electric vehicle or hybrid vehicle. Likewise, power electronics or a drive motor can serve as a heat source in such a vehicle. Further, a heat exchanger for cooling a cooling air flow, the one

Passenger compartment is supplied to form a heat source.

In another advantageous development, the interconnection in a first connecting line fluidically connecting the subcooler to the condenser may include a nonreturn stop valve which blocks in the heating switched position and in which

Cooling switch position opens. The check valve is so in the first

Connected connecting line, that it blocks from the subcooler in the direction of the condenser, while it can be flowed through in the opposite direction, ie from the condenser in the direction of the subcooler. Furthermore, the interconnection in a condenser to the desuperheater fluidly connecting the second connecting line may include a controllable shut-off valve which is locked in the Heizschaltstellung and open in the cooling switching position. As a result, the arrangement for the Heizschaltstellung and the parallel arrangement for the cooling switch position can be particularly easy to implement using the interconnection.

In another advantageous development, a controller for switching the interconnection between the Heizschaltstellung and the cooling switching position provided be. This control is coupled to the coolant pump, so that the controller can control the coolant pump to the pumped by the coolant pump

Volume flow of the coolant to change or adjust. Furthermore, the

Control suitably programmed and / or configured so that it controls the coolant pump for setting a smaller volume flow in the Heizschaltstellung than in the cooling switch position. The components of the condensation device are expediently optimized for the Heizschaltstellung, so that in the then existing series circuit, a predetermined volume flow in the coolant can be realized, which ensures sufficient heat absorption in the coolant. The aim here is the highest possible temperature in the coolant in order to achieve the heating of the heating air flow as efficiently as possible in the heating heat exchanger. In the cooling switch position, however, can be due to the parallel arrangement of the components of the

Condenser realize a significantly higher volume flow in the coolant, which is achieved by a corresponding control of the coolant pump, so that ultimately can be transmitted to the coolant and discharged over the high volume flow comparatively much heat.

According to another advantageous embodiment, the coolant circuit can have a controllable bypass which bypasses the heating heat exchanger and which is open at least in the cooling switched position and is locked at least in the heating switched position. With the help of the bypass, the heating heat exchanger and thus its flow resistance can be bypassed when heating the Heizluftstroms is not required, for example, in the cooling mode.

In another advantageous embodiment, the refrigerant circuit in

Condenser or between the condenser and the subcooler one

Have a refrigerant collector. As a result, a reservoir or storage volume is created in a region of the refrigerant circuit in which the refrigerant is liquid, in order to store excess refrigerant and to forward only liquefied refrigerant, if present, to the subcooler. Non-liquefied refrigerant will be retained in the collector.

According to another advantageous embodiment, an electric heater may be arranged in the coolant circuit, with respect to the flow direction of the

Coolant is arranged in the coolant circuit upstream of the heating heat exchanger.

Appropriately, the heater is in the coolant circuit between the

Heating heat exchanger and the coolant pump. With the help of the auxiliary heater can, if necessary In addition, heat is introduced into the coolant, if the over the

Heat supplied to the refrigerant circuit should not be sufficient to effect the desired heating of the heating air flow.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.

It show, each schematically:

Fig. 1 is a greatly simplified schematic diagram of a schematic

2 shows an illustration as in FIG. 1, but during a cooling operation. FIG.

According to FIGS. 1 and 2, a vehicle air-conditioning installation 1, as may preferably be used in a hybrid vehicle or in an electric vehicle, comprises a coolant circuit 2 and a coolant circuit 3. A coolant circulates in the coolant circuit 2. In the coolant circuit 3 circulates a coolant. The refrigerant circuit 2 includes a refrigerant compressor 4 and a condensation device 5, which is arranged downstream of the refrigerant compressor 4 in the refrigerant circuit 2 with respect to a flow direction 6 of the refrigerant, which is indicated by arrows in the figures. The refrigerant circuit 2 also has a conventional evaporator, not shown here, which is coupled to a heat source to evaporate the refrigerant. Said evaporator is in the refrigerant circuit 2 between the

Condenser 5 and the refrigerant compressor 4 is arranged. Furthermore, downstream of the condensation device 5 and upstream of the evaporator usually a throttle device, not shown here, is present, against which the

Refrigerant compressor works. The coolant circuit 3 contains a coolant pump 7 for driving the coolant, wherein a flow direction 8 indicated by arrows in FIGS. 1 and 2 is established for the coolant. Further, the coolant circuit 3 includes a.

Heating heat exchanger 9, by means of which a Heizluftstrom 10 can be heated, with which the heating heat exchanger 9 can be acted upon. This Heizluftstrom 10 is indicated in Figure 1 by arrows and can be supplied, for example, a passenger compartment of the vehicle.

The refrigerant circuit 2 and the coolant circuit 3 are thermally coupled to one another via the condensation device 5. Accordingly, the condensation device 5 is also integrated in the coolant circuit 3.

The condensation device 5 is divided in terms of their heat transfer function into three components, namely a desuperheater 11, a condenser 12 and a subcooler 13. In the refrigerant circuit 2, these three components 11, 12, 13 are arranged in series, such that first the desuperheater 11 is flowed through in that then the condenser 12 is flowed through and finally the subcooler 13 is flowed through. The coolant circuit 3 is now thermally coupled with all three components 11, 12, 13.

In order to achieve the thermal coupling of the coolant circuit 3 with the components 11, 12, 13 of the condensation device 5, a fluidic coupling is provided, which is realized by means of an interconnection 14. Here, purely by way of example, this interconnection 14 comprises a first desalting line 15, which supplies an inlet of the coolant to the

Desuperheater 11 represents a second dewatering line 16, which represents a drain of the coolant from the desuperheater 11. Furthermore, a first subcooler line 17, which represents an inlet to the subcooler 13 for the coolant, and a second subcooler line 18, which represents an outflow from the subcooler 13 for the coolant, are provided. Furthermore, a first capacitor line 19 and a second capacitor line 20 are provided, which also serve as inlet and outlet for the coolant to the condenser 12 and the condenser 12. Furthermore, the interconnection 14 comprises a first inlet 21 and a second inlet 22 which are in fluid communication with the first desuperheater conduit 15, the first subcooler conduit 17 and the first condenser conduit 19. Furthermore, the interconnection 14 has an outlet 23 which communicates with the second desalting line 16, the second subcooler line 18 and the second

Capacitor line 20 is fluidly connected. A first connection line 24 fluidly connects on an inlet side having the inlets 21, 22

Subcooler 13 with the condenser 12. A second connecting line 25 fluidly connects the desuperheater 11 to the condenser 12 on an outlet side having the outlet 23. A third connecting line 26 is again arranged on the inlet side and fluidically connects the condenser 12 to the desuperheater 11. A Fourth connection line 27 is arranged on the outlet side and fluidly connects the subcooler 13 to the condenser 12. More specifically, the first one connects

Connecting line 24, the first capacitor line 19 with the first subcooler line 17. The second connecting line 25 connects the second Enthitzerleitung 16 with the second capacitor line 20. The third connecting line 26 connects the first Enthitzerleitung 5 with the first capacitor line 19. The fourth connecting line 27 connects the second subcooler line 18 with the second capacitor line 20th

The interconnection 14 is switchable between a Heizschaltstellung shown in Figure 1 and a cooling switch position shown in Figure 2. The two switching positions differ from each other by different fluidic couplings of the coolant circuit 3 with the individual components 11, 12, 13 of the

Condensing device 5.

According to the Heizschaltstellung shown in Figure 1, the interconnection 14 leads the

Coolant circuit 3 successively through the subcooler 13, the condenser 12 and the desuperheater 11. As a result, in a heating operation of the air conditioning system 1, in which the Heizluftstrom 10 is heated, the subcooler 13, the condenser 12 and the desuperheater 11 flows through the coolant in succession , Regarding the

Flow direction 8 of the coolant is the capacitor 12 upstream of the

Enthitzers 11 and arranged downstream of the subcooler 13, which is responsible for the

Condenser 5 sets a flow according to the countercurrent principle. In this heating operation, a comparatively high end temperature can be achieved at the outlet 23 for the cooling medium. As a result, the heating air flow 10 can be heated in the heating heat exchanger 9 with high efficiency.

According to the cooling switching position shown in Figure 2, the interconnection 14 leads the

Coolant circuit 3 in this case in parallel through the subcooler 13, the condenser 12 and the desuperheater 11. In this cooling operation of the air conditioning system 1 thus the subcooler 13, the condenser 12 and the desuperheater 11 are flowed through in parallel by the coolant. This parallel flow allows a comparatively large volume flow in the coolant, whereby in cooling operation comparatively much heat from Refrigeration circuit 2 can be transferred to the cooling circuit 3. In particular, a corresponding amount of heat can thus be delivered to an environment of the vehicle via an ambient heat exchanger thermally coupled to the coolant circuit 3.

The flow through the three components 11, 12, 13 of the condensation device 5 with the refrigerant remains the same in heating mode and in cooling mode, so that the

Components 11, 12, 13 are flowed through in series by the refrigerant.

The coolant circuit 3 can in particular for cooling a main battery or

Traction battery of an electric vehicle serve. Likewise, the coolant circuit can cool a power electronics and / or a drive motor of the vehicle.

Accordingly, the coolant circuit 3 has a corresponding thermal coupling to the components of the vehicle, which are not shown here. Further, in the coolant circuit 3 a here also not shown cooler, so a heat exchanger may be arranged, which can be acted upon by an ambient air flow to transfer heat from the coolant to the environment and thus to cool the coolant.

At the first inlet 21 while an inlet 28 of the coolant circuit 3 is connected, which comes in particular from the aforementioned cooler. The outlet 23 is connected via a line 29, in which the coolant pump 7 and the heating heat exchanger 9 are arranged, to a return 30 of the coolant circuit 3, which leads in particular to the above-mentioned radiator.

For the heating operation of the coolant circuit 3 is equipped with a return line 31 which is connected downstream of the heating heat exchanger 9 to the line 29 and leads bypassing the return line 30 to the second inlet 22 of the interconnection 14. This return line 31 can be opened and closed by means of a switching valve 32, which is arranged in the return line 31 for this purpose. In order to block the return 30 for this case, another switching valve 33 is provided.

To realize the Heizschaltstellung and the cooling switching position are in the embodiment shown here, the interconnection 14 in the first connecting line 24, a check valve 34 and in the second connecting line 25, a controllable check valve 35 is arranged. In the Heizschaltstellung according to Figure 1 blocks the

Return check valve 34 and the check valve 35 is also locked. Thus, at the same time open return line 31 is a self-contained circle for the Circulation of the coolant created, which is virtually decoupled from the flow 28 and the return 30. In detail, the coolant flows in the heating mode of the

Coolant pump 7 through the heating heat exchanger 9, through the return line 31 to the second inlet 22. From there, the coolant flows through the first subcooler 17 to the subcooler 13, through the second subcooler 18, the fourth

Connecting line 27, the second capacitor line 12 to the capacitor 12, through the first capacitor line 19, the third connecting line 26 and the first

Enthitzerleitung line 15 to the desuperheater 11 and through the second Enthitzerleitung 16 via the line 29 back to the coolant pump. 7

In contrast, in the cooling switch position according to FIG. 2, the

Non-return valve 34 can be flowed through and the check valve 35 is opened, while the return line 31 is locked at the same time. The coolant then flows from the flow 28 to the first inlet 21, from where it flows via the first desalting line 15 to the desuperheater 11 and via the third connecting line 26 and the first condenser line 12 to the condenser 12 and via the first connecting line 24 and the first

Subcooler 17 to the subcooler 13 passes. After the three components 11, 12, 13, the second subcooler line 18, the second capacitor line 20 and the second dewatering line 16 via the fourth connecting line 27 and the second

Connecting line 25 to the outlet 23 merged. From the outlet 23, the coolant passes through the line 29 to the return 30th

For the cooling switching position can be provided that the coolant pump 7 in

Cooling operation generates a larger volume flow in the coolant than in heating mode. The increased volume flow is possible by the parallel arrangement of the three components 11, 12, 13 in the coolant circuit 3 and leads to a higher heat transfer to the coolant circuit 3. In order to control the coolant pump 7 and the controllable actuators of the coolant circuit 3 accordingly, is a controller 36th

provided suitably with the switchable components of the

Coolant circuit 3 is connected. However, corresponding control lines are not shown here for the sake of clarity.

According to Figures 1 and 2, the coolant circuit 3 may have a bypass 37 which bypasses the heating heat exchanger 9 and with the aid of another

Control valve 38 can be controlled. In particular, in the cooling operation shown in Figure 2, the bypass 37 is opened, so that no flow through the

Heating heat exchanger 9 takes place. Further, according to Figures 1 and 2, in the refrigerant circuit 2 between the condenser 12 and the subcooler 13, a refrigerant collector 39 may be arranged, intercepted in the gaseous refrigerant and excess liquid refrigerant can be stored. Alternatively, it is also possible in principle, the

Refrigerant collector 39 to be integrated into the condenser 12.

According to FIGS. 1 and 2, an electric heater 40 is additionally arranged in the coolant circuit 3. Suitably, the heater 40 is doing with respect to

Flow direction 8 of the coolant in the coolant circuit 3 upstream of the

Heating heat exchanger 9 arranged. The bypass 37 is positioned here so that it also bypasses the heater 40. Thus, the bypass 37 is the input side between the

Coolant pump 7 and the heater 40 to the coolant circuit 3 and connected to the line 29.

Claims

claims

1. vehicle air conditioning system, in particular for a hybrid vehicle or

Electric vehicle

- With a refrigerant circuit (2) in which a refrigerant circulates and the one

Refrigerant compressor (4) and a condensation device (5),

- With a coolant circuit (3) in which a coolant circulates and the one

Coolant pump (7) and a heating heat exchanger (9) for heating a Heizluftstroms (10),

- Wherein the refrigerant circuit (2) and the coolant circuit (3) via the

Condensation device (5) are thermally coupled together,

characterized,

- That the condensation device (5) has a desuperheater (11), a capacitor

(12) and a subcooler (13),

- That the condenser (12) with respect to a flow direction (6) of the refrigerant in the refrigerant circuit (2) downstream of the Enthitzers (11) and upstream of the subcooler

(13) is arranged,

- That the coolant circuit (3) with the desuperheater (11) and with the condenser (12) and with the subcooler (13) is thermally coupled.

2. Plant according to claim 1,

characterized in that

an interconnection (14) for the fluidic coupling of the coolant circuit (3) with the condensation device (5) between a Heizschaltstellung and a

Cooling switch position is switchable, which is characterized by a different fluidic Coupling of the coolant circuit (3) with the desuperheater (11), the condenser (12) and the subcooler (13) differ from each other.

Plant according to claim 2,

characterized in that

the circuit (14) the coolant circuit (3) in the Heizschaltstellung successively through the subcooler (13), the condenser (12) and the desuperheater (1 1) leads.

Plant according to claim 3,

characterized in that

in the Heizschaltstellung the capacitor (12) with respect to a flow direction (8) of the coolant in the coolant circuit (3) upstream of the Enthitzers (1 1) and downstream of the subcooler (13) is arranged.

Plant according to one of claims 2 to 4,

characterized in that

the interconnection (14) leads the coolant circuit (3) in parallel in the cooling switched position through the subcooler (13), the condenser (12) and the desuperheater (11).

Installation according to one of claims 2 to 5,

characterized in that

- That the interconnection (14) in a the subcooler (13) with the capacitor (12) fluidly connecting the first connecting line (24)

Includes check valve that locks in the Heizschaltstellung and opens in the cooling switch position,

- That the interconnection (14) in a the capacitor (12) with the desuperheater (1 1) fluidly connecting the second connecting line (25) has a controllable

Lock valve (35) contains, which is locked in the Heizschaltstellung and in the.

Cooling switch position is open.

Plant according to one of claims 2 to 6,

marked by

a controller (36) for switching the interconnection (14) between the

Heating switch position and the cooling switch position, wherein the controller (36) coupled to the coolant pump (7) for changing the volume flow of the coolant is, wherein the controller (36) in the Heizschaltstellung a smaller

Volume flow for the coolant sets as in the cooling switch position.

8. Installation according to one of claims 1 to 7,

characterized in that

the coolant circuit (3) has a controllable bypass (37) bypassing the heating heat exchanger (9).

9. Plant according to one of claims 1 to 8,

characterized in that

the refrigerant circuit (2) in the condenser (12) or between the condenser (12) and the subcooler (13) has a refrigerant collector (39).

10. Plant according to one of claims 1 to 9,

characterized in that

in the coolant circuit (3) an electric heater (40) is arranged, which is arranged with respect to the flow direction (8) of the coolant in the coolant circuit (3) upstream of the heating heat exchanger (9).