WO2018149703A1

WO2018149703A1 - Air-conditioning device for a motor vehicle

Info

Publication number: WO2018149703A1
Application number: PCT/EP2018/052987
Authority: WO
Inventors: Özgür Aktas; Daniel Hildebrandt; Thomas Hackl; Andreas Scholtz
Original assignee: Volkswagen Aktiengesellschaft
Priority date: 2017-02-15
Filing date: 2018-02-07
Publication date: 2018-08-23
Also published as: CN110267834A; DE102017202472B4; CN110267834B; DE102017202472A1

Abstract

The invention relates to an air-conditioning device for a motor vehicle which comprises a first cooling agent circuit (100) having a compressor (102), a first heat exchanger (104) designed as an air/cooling agent heat exchanger, a first exterior exchanger (108), a first interior exchanger (106) and an expansion member (110), and having a chiller (401), which is arranged as a coolant/cooling agent heat exchanger in a branch of the coolant sub-circuit that opens into the first compressor (102) on the inlet side, wherein a further expansion member (110) is provided upstream of said chiller. The air conditioning device further comprises a coolant circuit (300) having electronic components (330, 332, 334, 336) that comprises a second exterior exchanger (308). A second cooling agent circuit (200), which can be operated independently of the first cooling agent circuit (100), comprises a second compressor (202), a coupling condenser (402) designed as a coolant/cooling agent heat exchanger, a further expansion member (210) and a second interior exchanger (206) formed as an air/cooling agent heat exchanger.

Description

description

Air conditioning device for a motor vehicle

The invention relates to an air conditioning device for a motor vehicle, comprising

- A first refrigerant circuit with

A first compressor for compressing the first refrigerant,

A first heat exchanger arranged downstream of the compressor in the first refrigerant flow direction and designed as an air / refrigerant heat exchanger, the first heating exchanger, which can be guided by a first interior region which can be led into a first interior region of the motor vehicle

Indoor air flow is flowed through,

A refrigerant partial circuit upstream of the first heat exchanger in the first refrigerant flow direction and upstream of the compressor, which can be flowed through in an adjustable flow direction and which has a first outer exchanger designed as an air / refrigerant heat exchanger and permeable by a first outside air flow, as an air / refrigerant Heat exchanger formed and can be flowed through by the first inner air flow, the first inner exchanger and a between the first

External exchanger and the first internal exchanger arranged expansion element, and

A chiller configured as a coolant / refrigerant heat exchanger, which is arranged upstream of a branch of the refrigerant partial circuit which opens on the input side of the first compressor and is preceded by a further expansion element, and

a coolant circuit,

which is thermally coupled to electrical components of the motor vehicle, wherein the chiller is part of the Kühlmittelkrieses coolant.

Such an air conditioning device is known from DE 10 201 1 109 055 A1.

With regard to the terminology used, it should be noted that the terms "heat exchanger", "outdoor exchanger", "internal exchanger" and "chiller" as well as the term "coupling capacitor" used below deliberately represent terms chosen foreign to the term to the reference to the respective elements In the context of the following description, their technical characteristics, insofar as relevant for the present invention, in particular their design as one special form of heat exchanger and / or their positioning in the overall system of the air conditioning device are to be found only in the corresponding specification in the text. The term "first refrigerant flow direction", as well as the term "second refrigerant flow direction" used below, to be understood as an abbreviation for the flow direction of the first and the second refrigerant.

The refrigerant circuit of the known air conditioning device, i. The circuit referred to here as the first refrigerant circuit can be operated either in the cooling and in the heat pump mode. In the cooling mode, compressed refrigerant is precondensed in the heat exchanger acting as a condenser and undergoes further condensation in the first external exchanger, which acts as a main condenser, wherein the refrigerant heated by the compression releases heat to the first outside airflow passing through the first external exchanger. The condensed refrigerant is then expanded by means of an expansion device and evaporated in the first internal exchanger, which operates as an evaporator in this operating mode. The first inner air flow flows through the first inner exchanger and gives off heat to the refrigerant evaporating there. The thus cooled, first inner air flow is then, possibly after (partial) flow through the heat exchanger for the purpose of counter heating, directed into a first region of the motor vehicle interior to cool this according to the user or an automatic climate control. in the

Heat pump mode is the compressed and precondensed in the heat exchanger

Refrigerant, however, passed directly into the first internal exchanger, in this

Operating mode acts as another capacitor. The first inside air flow flowing through it is thereby heated and, if necessary, after further heating by (partial) flow through the first heat exchanger, directed into the first region of the motor vehicle interior in order to heat it according to the specifications of the user or automatic air conditioning. Behind the first internal exchanger, the refrigerant is expanded by means of the expansion device and in the first external exchanger, which acts as an evaporator in this operating mode, evaporates, absorbing heat from the first outside air stream. Furthermore, the refrigerant circuit of the known air conditioning device comprises a chiller here called

Coolant / refrigerant heat exchanger, which is arranged in a branch of the outer and the inner exchanger comprising the partial circle and, if necessary, can be flowed through with refrigerant. In each of the operating modes explained above, the chiller is connected downstream via an expansion element to the respective exchanger acting as a condenser and acts as an evaporator. When it evaporates in the chiller, the refrigerant absorbs heat from the coolant circuit, which is thermally coupled via the chiller

Essentially for absorbing heat from electrical components of the motor vehicle, such as a traction battery or an electric drive unit, is used. The heat absorbed can be delivered in the cooling mode via the first outer exchanger to the environment or in the heat pump mode via the first inner exchanger to the interior, in the latter case, an increase in efficiency of

Heating process is observed.

To improve comfort, it is common in modern motor vehicles, various

To make interior areas substantially independently of each other air-conditioned. Starting from the known air conditioning device, this is possible in various obvious ways. So it is basically known to equip a refrigerant circuit with two internal exchangers for two different interior areas. In order to ensure full climate functionality for each of the interior areas, a refrigerant circuit would, as described above, also be equipped with a further heat exchanger, so that a total of five air / refrigerant heat exchangers, four of which are operated at different times as an evaporator or a condenser , And a coolant / refrigerant heat exchanger must be present as a chiller in the same refrigerant circuit. This is hardly controllable in terms of control technology. Alternatively, an identical, second refrigerant circuit could be provided for the second interior area. However, this means a considerable expenditure on equipment, which can not be realized in the notoriously limited installation space in motor vehicles. In particular, for the further outer exchanger to be positioned in the front carriage, it will hardly be possible to provide sufficient installation space while retaining the (proven) capacity dimensioning.

It is the object of the present invention to provide a generic

To further develop air conditioning device such that several interior areas of the motor vehicle can be individually and independently air-conditioned without excessive installation space.

This object is achieved in conjunction with the features of the preamble of claim 1, characterized in that the coolant circuit comprises a designed as an air / coolant heat exchanger, can be flowed through by a second outside air flow, second outer exchanger and

by a second refrigerant circuit which is operable independently of the first refrigerant circuit and

a second compressor for compressing second refrigerant,

- A second compressor in the second refrigerant flow direction

downstream, designed as a coolant / refrigerant heat exchanger

Coupling capacitor, - A downstream of the coupling capacitor in the second refrigerant flow direction further expansion element and

- This expansion element in the second refrigerant flow direction

downstream, designed as an air / refrigerant heat exchanger, second

Inner exchanger, which can be flowed through by a second inner air flow which can be conducted into a second interior region of the motor vehicle,

includes,

wherein the coupling capacitor is part of the coolant circuit coolant side.

Preferred embodiments of the invention are the subject of the dependent

Claims.

The invention initially starts with a simple extension of the coolant circuit around its own external exchanger, as is generally known to the person skilled in the art, in particular by non-thermally coupled refrigerant and coolant circuits.

The core idea of the invention is now, for the second, to be air-conditioned

Interior area to provide a minimized second refrigerant circuit. This can basically on the minimum components of a refrigerant circuit, namely a

Compressor, two heat exchangers and an expansion device, can be reduced. Of the heat exchangers, one always works as an evaporator and the other as a condenser. The former is designed as an air / refrigerant heat exchanger and serves as the second

Internal exchanger, i. Cooling of an air flow, which is conductive to the second interior space. The other heat exchanger is designed as a coolant / refrigerant heat exchanger and integrated into the coolant circuit on the coolant side. The concrete design of the

Coolant circuit is of minor importance at this point. preferred

Embodiments will be discussed below. In the present context is only relevant that the coolant circuit at least the chiller, referred to here as a coupling capacitor and designed as a coolant / refrigerant heat exchanger

Heat exchanger of the second refrigerant circuit and the second outer exchanger and is thermally coupled to electrical components of the motor vehicle. In particular, the coolant circuit can be used for cooling an electric drive unit and / or for controlling the temperature of a traction battery and / or power electronics. A third external exchanger is not required as part of the second refrigerant circuit. Therefore, the available space in the front of the vehicle space can be used in the usual way by the first and second outdoor exchanger. The particular advantage resulting from the design of the invention

Air conditioning device results, can be explained with particular clarity in the extreme case of particularly hot outside temperatures when the second refrigerant circuit operates at full load. The entire accumulating in the second refrigerant circuit heat is over the

Output coupling capacitor to the coolant circuit and could on the second

External exchangers are discharged to the environment. However, this can lead to undesirably high temperatures in the coolant circuit under extreme operating conditions.

Certain electronic components, which are tempered by the coolant circuit, tolerate, for example, temperatures above 40 ° C only bad. However, the chiller forms another interface of the coolant circuit, through which heat can be delivered to the first refrigerant circuit. The heat of the second refrigerant circuit can thus be distributed to the environment to the first and the second outer exchanger, so that takes place within the coolant circuit no excessive heating.

A preferred embodiment of the invention is characterized by a further coolant circuit which comprises a second heat exchanger designed as an air / coolant heat exchanger and permeable by the second inner air flow. At this

Embodiment is thus the second air-conditioned interior area with a

Provided counter heating, by the second inner air flow can be conducted through two heat exchangers, which are required antagonistically operable. Unlike the first air-conditioned interior area here, however, the heat exchanger is not part of the refrigerant circuit, but part of a coolant circuit. It is particularly preferred that this coolant circuit is an independently operable, first coolant circuit of the coolant circuit. This first coolant subcircuit can thus be fluid-conductively connected or connectable to the remaining coolant circuit, which simplifies in particular the maintenance, filling and emptying of the overall coolant system. Also

In terms of control engineering, a broader variation spectrum results if, due to the coupling mentioned, heat is exchanged between the first coolant circuit and the remainder of the circuit

Coolant circuit can be replaced.

As is customary in antagonistically operated counterheating systems, it is preferably provided in the context of the present invention that adjustable air conduction means are arranged on the air side between the second inner exchanger and the second heat exchanger, by means of which the second inner air flow can be conducted in adjustable proportions through the second inner exchanger and / or the second heat exchanger are. This allows the proportions of the second internal air flow, which are passed through one, the other or both air-heat exchanger,

be varied as needed. The complexity of the coolant circuit may alternatively or additionally be increased in other ways. In a preferred embodiment of the invention, it is provided that the second outer exchanger two air side connected in series, each as a

Air / coolant heat exchanger formed exchanger elements comprises. The two individual exchanger elements can be assigned to different partial circuits of the overall coolant system. Thus, in particular, it may be provided that a first of the exchanger elements is part of an independently operable, second-half coolant circuit comprising the coupling exchanger on the coolant side. This second coolant loop would then be part of the above explained as its primary task

Basic function of the present invention meet, namely the heat removal from the second refrigerant circuit via the second outer exchanger.

The second of the exchanger elements of the second outer exchanger is preferably part of an independently operable, a thermal coupling to at least one of the electrical components of the motor vehicle comprehensive, the third coolant circuit part. The third coolant subcircuit thus has the primary task of tempering the electrical components. The formation of a separate coolant pitch circle for this allows a demand-based heat exchange with other coolant pitch circles;

On the other hand, however, an independent control of the other sub-circuits can be realized, for example, if other sub-circuits already operate at their limit and a fluidic coupling of the sub-circuits would lead to unacceptably high temperatures at the electrical components.

The chiller is preferably part of an independently operable coolant, a thermal coupling to at least one of the electrical components of the motor vehicle comprehensive, fourth coolant subcircuit. These can be the same electrical ones

Components that are also connected to the third coolant circuit, be other electrical components or an overlapping group of electrical components. Again, the pitch circle solution serves to widen the range of options in the scheme so that, if necessary, either heat exchanged between the pitch circles or the pitch circles can be operated independently.

The person skilled in the art will understand that the structuring of the overall coolant system into a plurality of coolant subcircuits, which can be fluidly connected to each other or decoupled from each other as required, can be technically realized by a corresponding arrangement of control valves. The special design of the individual control valves or Their arrangement in the system and their concrete control strategy, of course, depend on the complexity and the regulatory strategy in each specific case.

In a development of the invention, it is provided that at least one coolant pitch circle comprises an electrical coolant heater. Of course, the main focus of coolant systems is directed to the cooling of certain components. However, there are several situations conceivable in which a heating of the components is required. As an example, the start of electric machines at very cold outside temperatures, before a preheating example of the traction battery is advantageous. Since in some situations no heat is still available from one of the refrigerant circuits, an electric coolant heating is provided in this development of the invention.

Further features and advantages of the invention will become apparent from the following specific description and the drawings.

Show it:

1 shows a schematic representation of a particularly preferred embodiment of an air conditioning device according to the invention for a motor vehicle,

2 shows the air conditioning device of Figure 1 with emphasis on a first

Coolant pitch circle,

3 shows the air conditioning device of Figure 1 with emphasis on a second

Coolant pitch circle,

4 shows the air conditioning device of Figure 1 with emphasis on a third

Coolant pitch circle and

Figure 5 shows the air conditioning device of Figure 1 with emphasis on a fourth

Coolant pitch circle.

Like reference numerals in the figures indicate like or analogous elements.

FIG. 1 shows, in a highly schematic representation, a particularly preferred one

Embodiment of an air conditioning device 10 according to the invention, wherein the One skilled in the art will readily recognize from the foregoing explanation of the invention, in comparison to the following specific description, which of the illustrated elements are essential to the invention and which are optional in nature.

An essential part of the air-conditioning device 10 is a first refrigerant circuit 100, which has a compressor 102, a first heat exchanger 104, a first inner exchanger 106 and a first outer exchanger 108 and a plurality of expansion elements 110. Furthermore, the first refrigerant circuit 100 comprises a collector 1 12 and a plurality of control valves 1 14. In addition, the refrigerant circuit 100 comprises

on the refrigerant side a chiller 401.

The first heat exchanger 104, the first inner exchanger 106 and the first outer exchanger 108 are each formed as an air / refrigerant heat exchanger, wherein the first

Outdoor exchanger 108 can be flowed through by a first outside air stream 1 16. The first heat exchanger 104 and the first inner exchanger 106 are each of a first

Indoor airflow 1 18 can be flowed through. This can be passed by means not shown Luftleitmittel in a likewise not shown first interior region of the motor vehicle. Between the first heat exchanger 104 and the first inner exchanger 106 switchable air guide 120 are arranged, with which portions of the first inner air stream 1 18, which are passed through one and / or the other of the two heat exchangers 104, 106, are adjustable. The refrigerant side of the first refrigerant circuit included

Chiller 401 is designed as a coolant / refrigerant heat exchanger. On his

Coolant side part will be discussed in more detail below.

The basic functions of the refrigerant circuit 100 are known to those skilled in the art. in the

Cooling operation is compressed in the compressor 102 compressed refrigerant in the first heat exchanger 104 and further condensed in the first outer exchanger 108. It is then passed through the operated as an evaporator first inner exchanger 106, wherein it previously undergoes a suitable relaxation by one of the intermediate expansion valves 1 10. Afterwards, the refrigerant is returned via the collector 1 12 to the suction side of the

Compressor 102 is supplied. However, it is also possible, in the cooling operation, the refrigerant behind the first outer exchanger 108 at least partially on the also as

Evaporator acting chiller 401 to conduct.

In the heat pump mode, the refrigerant flows behind the first heat exchanger 104 into the first internal exchanger 106, which in this case acts as a further condenser. Subsequently, the refrigerant may be wholly or partly via the first outer exchanger 108 and / or the Chiller 401, which are both operated in this mode of operation as an evaporator, to the collector 1 12 and the suction side of the compressor 102 are returned. The required expansion of the refrigerant is via the interposed

Expansion valves 1 10 realized.

The number and arrangement of the selected in the illustrated embodiment

Expansions, here realized as the expansion valves 1 10, has proven to be particularly efficient and also allows intermediate states between the above-mentioned modes of operation.

As a further essential component, the air-conditioning device 10 has a second refrigerant circuit 200. In the embodiment shown, this is essentially reduced to its basic components, namely a second compressor 202, a second internal exchanger 206, an expansion element 210 and the refrigerant-side part of a

Coupling switch 402.

During the second inner exchanger 206, as well as the first inner exchanger 106, as

Air / refrigerant heat exchanger is formed, the coupling exchanger 402, as well as the chiller 401 is designed as a coolant / refrigerant heat exchanger. The second

Internal transformer 206 is by a second inner air flow 218 by ström bar, which is conductive via not shown air guide into a likewise not shown second interior region of the motor vehicle.

The second refrigerant circuit 200 is operable substantially only in the cooling mode, wherein the compressed refrigerant in the compressor 202 condenses in the coupler 402, in

Relaxation member 210 is relaxed and evaporated in the second internal exchanger 206. It is then returned via a second collector 212 to the suction side of the

Compressor 202 passed.

The coolant sides of the coolant / refrigerant heat exchangers 401, 402 are part of a complex coolant circuit 300, which also includes a second outer exchanger 308 designed as an air / coolant heat exchanger. This is traversed by a second outside air stream 316 and consists in the embodiment shown of two air side connected in series exchanger elements. Other components of the coolant circuit 300 are various switching valves 314, various coolant pumps 322, a plurality of check valves 324 and a surge tank 326. In addition, two electric coolant heaters 328 are integrated in the embodiment shown. Of the Coolant circuit 300 is in thermal contact with electrical components of the

Motor vehicle, in particular a traction battery 330, power electronics 332, a charger 334 and an electric machine 336th

In the illustrated embodiment, the coolant circuit includes a first coolant subcircuit 300 '. This is in the illustration of Figure 2, which otherwise the same

Air conditioning device 10 as Figure 1 shows graphically highlighted. The first coolant subcircuit 300 'essentially comprises only one coolant pump 322, an optional electrical coolant heater 328 and a second heat exchanger 304 designed as an air / coolant heat exchanger. The second heat exchanger 304, which is connected downstream of the second internal heat exchanger 206 via air conduction means 220 , is permeable by the second inner air flow 218 and allows by antagonistic operation with the second inner exchanger 206 a very precise temperature control of the second interior space. Alternatively or additionally, an electric air heater for the second

Inside air flow 218 may be provided, which is formed for example as an air PTC heat exchanger. The task of the first coolant subcircuit 300 'could alternatively be formed by a completely connection-free to the other coolant circuit 300, second

Coolant circuit can be met. In the embodiment shown, however, a fluidic coupling is provided which, while the coolant pump 322 of the first coolant subcircuit 300 'is in operation, does not undergo substantial fluid exchange with the rest

Coolant circuit 300 performs, but a common filling and emptying both

System components, which simplifies their maintenance.

The skilled person should have already made it clear from the previous description that the air conditioning device 10 according to the invention in a very flexible manner

Heat transfer between the refrigerant circuits 100, 200 on the one hand and the

Coolant circuit 300 on the other hand, or between the refrigerant circuits 100, 200th

allows each other via the coolant circuit 300. In this way, in particular in the second refrigerant circuit 200 resulting heat very flexible over the first

Outdoor exchanger 108 and / or are discharged via the second outer exchanger 308 to the environment, the control can always be done so that temperature-sensitive areas of the coolant circuit 300 are not heated too much.

FIG. 3 again shows the air-conditioning device 10 of FIG. 1, wherein a second

Coolant subcircuit 300 "of the coolant circuit 300 by line-bold representation

is exposed. This subcircuit, which can be controlled essentially independently, primarily serves to dissipate heat absorbed in the heat exchanger 402 via one of the heat exchangers Elements of the second outer exchanger 308. It can be seen that this pitch circle 300 "no direct thermal coupling with any temperature-sensitive, electrical

Components has.

FIG. 4 again shows the air-conditioning device 10 of FIG. 1 with a third coolant subcircuit 303 '", which is also shown in FIG

Essentially independently and is primarily the heat dissipation of

Power electronics 332, charger 334 and electrical machine 336 via the second element of the second external exchanger 308 is used.

FIG. 5 again shows the air-conditioning device 10 of FIG. 1 with fourth coolant subcircuit 300 "" lifted out by line-bold representation, which is also shown in FIG

Essentially independently and is primarily the tempering of

Traction battery 330 by means of the chiller 401 is used. As explained above, the chiller can be used both as an evaporator, i. cooling, as well as a capacitor, i. warming, be used. In addition, the coolant heater 328 contained in the fourth partial circuit 30 "" can be used as an additional heat source.

The skilled person will understand that in a complex and manifold

Control options provided coolant circuit 300, as shown in the figures, in addition to the independent operation of the pitch circles and their almost any combination is possible to absorb heat with particular efficiency from where it accumulates and where it is needed or discharged can. Such a thing

Efficiency management in heat distribution is particularly important in exclusively or at least substantially electrically powered vehicles with little or no heat accumulation of an internal combustion engine in terms of range optimization of particular importance.

Of course, the embodiments discussed in the specific description and shown in the figures represent only illustrative embodiments of the present invention. In the light of the disclosure herein, those skilled in the art will be offered a wide range of possible variations. LIST OF REFERENCE NUMBERS

air conditioning unit

first refrigerant circuit

first compressor

first heat exchanger

first internal exchanger

first outdoor exchanger

Expansion valve in 100

Collector in 100

Control valve in 100

first outside airflow

first inside airflow

Airlubber in 100

second refrigerant circuit

second compressor

second internal exchanger

Expansion valve in 200

Collector in 200

Coolant circuit

'first circle of 300

"second circle of 300

'' third circle of 300

"" fourth district of 300

second external exchanger

Control valve in 300

second outside air flow

Coolant pump

check valve

surge tank

electric coolant heating

traction battery

power electronics

charger

electric machine

Chiller

coupling capacitor

Claims

claims

1. Air conditioning device for a motor vehicle, comprising

- A first refrigerant circuit (100) with

A first compressor (102) for compressing the first refrigerant,

• one the compressor (102) in the first refrigerant flow direction

downstream and formed as an air / refrigerant heat exchanger, the first heat exchanger (104), which can be flowed through by a in a first interior region of the motor vehicle conductive, the first inner air flow (1 16),

• adjustable downstream of the first heat exchanger (104) in the first refrigerant flow direction and upstream of the compressor (102)

Flowed through the flow direction refrigerant pitch circle, designed as an air / refrigerant heat exchanger and by a first outside air flow (1 16) through-flow, first outer exchanger (108) designed as an air / refrigerant heat exchanger and by the first inner air flow (1 18) , first internal exchanger (106) and an expansion element (110) arranged between the first external exchanger (108) and the first internal exchanger (106), and

• one in an input side of the first compressor (102) opening

Branch of the refrigerant circuit arranged as a coolant / refrigerant heat exchanger trained chiller (401), the another

Expansion element (1 10) is connected upstream,

and

a coolant circuit (300) which is thermally coupled to electrical components (330, 332, 334, 336) of the motor vehicle,

wherein the chiller (401) is part of the refrigerant circuit (300) on the coolant side, characterized

that the coolant circuit (300) as an air / coolant heat exchanger

formed, by a second outside air flow (316) through which can flow, second outer exchanger (308) and

by a second refrigerant circuit (200) independent of the first one

Refrigerant circuit (100) is operable and

a second compressor (202) for compressing second refrigerant,

- A second compressor (202) in the second refrigerant flow direction

Downstream, designed as a coolant / refrigerant heat exchanger coupling capacitor (402), - A further downstream of the coupling capacitor (402) in the second refrigerant flow direction further expansion element (210) and

a second internal exchanger (206) which is connected downstream of this expansion element (210) in the second refrigerant flow direction and which is designed as an air / refrigerant heat exchanger and can be flowed through by a second internal air flow (218) which can be conducted into a second interior region of the motor vehicle,

wherein the coupling capacitor (402) part of the coolant side of the

Coolant circuit (300) is.

Air conditioning device according to claim 1,

marked by

a further coolant circuit (300 '), which comprises a second heat exchanger (304) designed as an air / coolant heat exchanger and through which the second inner air flow (218) can flow.

Air conditioning device according to claim 2,

characterized,

that air side between the second inner exchanger (206) and the second

Heat exchanger (304) adjustable air guide means (220) are arranged, by means of which the second inner air flow (218) in adjustable proportions by the second

Innentauscher (206) and / or the second heat exchanger (304) are conductive.

Air-conditioning device according to one of claims 2 to 3,

characterized,

the further coolant circuit is an independently operable first coolant subcircuit (300 ') of the coolant circuit (300).

Air conditioning device according to one of the preceding claims,

characterized,

the second outer exchanger (308) comprises two exchanger elements which are connected in series on the air side and each designed as an air / coolant heat exchanger.

6. Air conditioning device according to claim 5,

characterized,

that a first of the exchanger elements on the coolant side is part of an independently operable second coolant subcircuit (300 ") comprising the coupling capacitor (402).

7. Air conditioning device according to one of claims 5 to 6,

characterized,

that the second of the exchanger elements on the coolant side is part of an independently operable, a thermal coupling to at least one of the electrical

Components (332, 334, 336) of the motor vehicle comprehensive, third coolant subcircuit (300 "') is.

8. Air conditioning device according to one of the preceding claims,

characterized,

that the chiller (401) on the coolant side is part of an independently operable, a fourth-order coolant circuit (300 "") comprising a thermal coupling to at least one of the electrical components (330) of the motor vehicle.

9. Air conditioning device according to one of claims 2 to 8,

characterized,

in that at least one coolant subcircuit (300 ', 300 "") has an electrical circuit

Includes coolant heater (328).

10. Air conditioning device according to one of claims 2 to 9,

in that the coolant subcircuits (300 ', 300 ", 300"', 300 "") can be connected to one another completely or partly by means of switching valves on the coolant side.