DE102010049916A1 - Method for utilizing waste heat from exhaust stream of internal combustion engine in vehicle, involves supplying exhaust gas stream of exhaust gas heat exchanger to waste heat recovery apparatus and absorption cooling machine - Google Patents

Abstract

The exhaust gas stream (AG) of an exhaust gas heat exchanger (4) is supplied to a waste heat recovery apparatus (3) and to an absorption cooling machine (14). A cooler (8) is arranged between the turbine (7) and the compressor (6). The closed Joule-cycle (JK) is set as Clausius-Rankine cycle in the downstream direction so that the Joule-cycle and the Clausius-Rankine cycle are connected with each other by the cooler and are thermally coupled with the working medium (AM). An independent claim is included for device for utilizing waste heat from exhaust stream of internal combustion engine in vehicle with absorption refrigerator.

Description

The invention relates to a method and a device for utilizing waste heat from an exhaust gas stream of an internal combustion engine according to the preamble of claims 1 and 8, respectively.

Modern internal combustion engines have efficiencies in the range of 30% to 40%. As a result, a large part of the chemical energy supplied to the internal combustion engine in the form of waste heat is preferably delivered to a vehicle environment via a coolant and an exhaust gas heat.

Known techniques for generating energy from the exhaust stream of an internal combustion engine are the exhaust gas turbocharger and the heating systems for motor vehicles. In the exhaust gas turbocharger, the exhaust gas flow drives a turbine. The energy that the turbine supplies uses a compressor to compress the air supplied to the engine. The compression of the air improves a cylinder filling of the internal combustion engine and thus leads to an increase in performance of the internal combustion engine.

Alternatively, the internal combustion engine is followed by a cycle in which the hot exhaust gas flow and partly the coolant of an internal combustion engine is used as a heat source for operating a second, downstream machine in the cycle. The cyclic process is usually a so-called Clausius-Rankine process, in which a liquid medium absorbs heat, which is predominantly evaporated with the supply of heat and then expanded in an expansion machine with release of mechanical energy to an output shaft. As a working medium come here organic agents, a mixture of such organic agents, alcohol mixtures or water-alcohol mixtures, water with certain additives into consideration. Here, a Joule process, in particular a closed Joule process, conceivable in which a gas is conveyed via a compressor to a correspondingly high pressure level and an exhaust gas heat exchanger of the internal combustion engine is supplied, wherein an exhaust heat to the working gas located in the Joule cycle is transmitted. This compressed and heated working gas is then expanded to release mechanical work in an expansion machine and recooled in a cooler before being fed back to the compressor.

For the operation of vehicle air conditioning systems, the required cooling capacity is generated by compressors in the prior art. There are mainly compressor air conditioning use, which must be additionally driven by the vehicle drive, especially of internal combustion engines or hybrid drives, and thereby disadvantageously lead to an increase in consumption. The mechanical energy of the vehicle drive, in particular of the internal combustion engine, is used here for the operation of the compressor, whereby the operation of the compressor air conditioning of the vehicle drive must additionally give the required power. Due to the low energy efficiency of internal combustion engines and air conditioning compressors creates a significant increase in consumption.

From the DE 10 2008 041 363 A1 is a vehicle air conditioner of an internal combustion engine having a motor vehicle is known, wherein the vehicle air conditioner is a absorption of the engine exhaust heat and / or waste heat of the internal combustion engine resorptions.

From the US Pat. No. 7,650,761 B2 is a chiller known which uses waste heat of an internal combustion engine in a Clausius Rankine process.

The invention has for its object to provide a comparison with the prior art improved, in particular more efficient device for waste heat recovery from an exhaust stream of an internal combustion engine. Furthermore, the invention has for its object to provide a comparison with the prior art improved, in particular more efficient method for energy recovery from an exhaust stream of an internal combustion engine.

With regard to the method, the object is achieved by the features specified in claim 1. With regard to the device, the object is achieved by the features specified in claim 8.

Advantageous developments of the invention are the subject of the dependent claims.

In the method for utilizing waste heat from an exhaust gas stream of an internal combustion engine in a vehicle with an absorption chiller, the exhaust gas flow is fed to at least one exhaust gas heat exchanger of a waste heat recovery device and then the exhaust gas flow and / or a waste heat flow of the waste heat recovery device supplied to the absorption chiller.

The invention improves waste heat utilization from the exhaust gas flow of internal combustion engines by connecting a waste heat recovery device and an absorption chiller on the exhaust side of the internal combustion engine. This will cause the exhaust gas flow contained thermal energy used on the one hand in the waste heat recovery device and the other in the absorption chiller. In particular, the exhaust gas stream leaving the exhaust gas heat exchanger of the waste heat recovery device has such thermal energy, which advantageously enables the operation of the absorption refrigeration machine. An internal combustion engine with waste heat recovery performed in this manner has higher efficiency than conventional internal combustion engines. In addition, fuel savings are achieved and the costs are significantly reduced due to the compact design.

In the waste heat recovery device, a working fluid is passed in a closed loop Joule cycle comprised of the exhaust gas heat exchanger, a turbine, a radiator disposed between the turbine and a compressor, and the compressor. Advantageously, the working medium of the closed Joule cycle process absorbs a subset of the thermal energy of the exhaust stream, wherein it is heated and accelerated, so that high heat transfer capacities are made possible.

In an advantageous embodiment, the closed Joule cycle process is followed by a Clausius-Rankine cycle process such that the Joule cycle and the Rankine cycle are thermally coupled by means of the cooler and the working medium of the Joule cycle is cooled. By connecting the Clausius-Rankine cycle after the Joule cycle ensures that the Rankine cycle process can be applied and operated with known liquid organic refrigerants as a working fluid, since the conversion of high exhaust gas temperatures and thus the waste heat of the exhaust gas the upstream Joule cycle and not over the Clausius-Rankine cycle is executed. As a result, the risk is significantly reduced or prevented that the working fluid in the Rankine cycle process is chemically unstable and destroyed due to the application of high exhaust gas temperatures.

By means of the turbine of the waste heat recovery device, mechanical energy is generated from at least a subset of the thermal energy of the exhaust gas flow. Thus, the unused in conventional internal combustion engines thermal energy of the exhaust stream is fed to a use.

By means of a subset of the remaining thermal energy of the exhaust stream, the absorption chiller is operated. The exhaust gas flow advantageously also contains, after flowing through the waste heat recovery device, a quantity of thermal energy which is sufficient for the operation of the absorption chiller and is used in the present case.

In a particularly advantageous embodiment, thermal energy of a coolant of the internal combustion engine is supplied to a refrigerant guided in the absorption refrigerating machine. Thereby, the heat energy of the coolant, which is discharged in conventional internal combustion engines by means of a coolant radiator to a vehicle environment, used efficiently.

By means of the absorption chiller advantageously a vehicle interior, a cargo space, a power storage and / or a control unit are cooled or air-conditioned. Thus, the use of a conventional compressor air conditioning, which is driven by the vehicle drive, in particular the internal combustion engine, avoided. As a result, fuel consumption of the vehicle is reduced.

In the apparatus for utilizing waste heat from an exhaust gas stream of an internal combustion engine in a vehicle having an absorption chiller, according to the present invention, a waste heat recovery device is a waste heat recovery device thermally coupled to an exhaust pipe and an absorption chiller is thermally coupled to an exhaust pipe and / or waste heat recovery exhaust heat recovery device.

A cooling circuit of the internal combustion engine and the absorption chiller are thermally coupled. As a result, advantageously, the thermal energy of the coolant of the internal combustion engine in the absorption chiller can be used.

Embodiments of the invention are explained in more detail below with reference to drawings.

Showing:

1 schematically an embodiment of a device for waste heat recovery from an exhaust stream of an internal combustion engine, wherein the exhaust side of the Internal combustion engine is a closed Joule cycle and an absorption chiller downstream,

2 1 schematically shows an alternative embodiment of a device for utilizing waste heat from an exhaust gas stream of an internal combustion engine, which is part of a serial hybrid drive device, wherein a closed Joule cycle and an absorption refrigeration machine are connected downstream from the internal combustion engine,

3 1 schematically shows a further alternative embodiment for a device for utilizing waste heat from an exhaust gas stream of an internal combustion engine, which is part of a serial hybrid drive device, wherein a closed Joule cycle is connected downstream from the internal combustion engine and an absorption refrigeration machine is thermally coupled to the closed Joule cycle,

4 schematically another alternative embodiment of a device for waste heat utilization from an exhaust gas stream of an internal combustion engine, which is part of a serial hybrid drive device, wherein the exhaust side of the internal combustion engine, a closed Joule cycle and an absorption chiller downstream and a Rankine cycle process with the closed Joule thermally -Circuit process is coupled and

5 schematically another alternative embodiment of a device for waste heat recovery from an exhaust stream of an internal combustion engine, wherein the exhaust side of the internal combustion engine, a closed Joule cycle and an absorption chiller are connected downstream and a coolant circuit of the internal combustion engine is thermally coupled to the absorption chiller.

Corresponding parts are provided in all figures with the same reference numerals.

1 shows a device 1 for the use of waste heat from the exhaust gas flow AG of an internal combustion engine 2 , In the internal combustion engine 2 it may be a conventional diesel or gasoline engine or other combustion engine z. B. a vehicle, in particular a motor vehicle or commercial vehicle. 1 shows a 4-cylinder internal combustion engine.

Exhaust side of the internal combustion engine 2 is a waste heat recovery device 3 downstream. The waste heat recovery device 3 is preferably formed as a closed Joule cycle JK.

The Joule cycle JK is a thermodynamic cycle, according to physicist James Prescott Joule. The closed Joule cycle JK includes an exhaust gas heat exchanger 4 , The primary side is flowed through by the exhaust stream AG and the secondary side is flowed through by a working medium AM of the Joule cycle JK.

On the primary side, an exhaust pipe opens 5 in the exhaust gas heat exchanger 4 and starts from this again.

Secondary side is the exhaust gas heat exchanger 4 in the Joule cycle JK on the input side a compressor 6 upstream. On the output side is the exhaust gas heat exchanger 4 in Joule cycle JK a turbine 7 downstream. Between the turbine 7 and the compressor 6 is a cooler in the closed joule cycle JK 8th , in particular a recooler or gas cooler arranged. The compressor 6 and the turbine 7 are on a common wave 9 arranged.

Instead of the turbine 7 can also be used another turbomachine. The cooler 8th can be directly flowed through by air and thus cooled or connected to a corresponding cooling circuit.

The hot exhaust gas flow AG of the internal combustion engine 2 is used to heat the Joule cycle JK downstream (especially the closed gas turbine process). This is particularly advantageous because especially the hot exhaust gases from an energetic and thermodynamic point of view have a temperature level that is capable of working and thus can lead to a relatively high overall efficiency. This is also advantageous from the point of view of construction costs with less space requirement, lower costs, lower weight, since the expense for the downstream Joule cycle JK is indeed present, but by using the high and thus thermodynamically working temperature levels to a relatively high efficiency gain in comparison for non-use of the temperature level of the exhaust stream AG leads.

At the wave 9 is a clutch 10 arranged, by means of which the shaft 9 and as a result the turbine 7 with a gear 11 can be coupled mechanically separable. The gear 11 is standing with a flywheel 12 the internal combustion engine 2 engaged.

According to the invention is in the exhaust pipe 5 downstream of the exhaust gas heat exchanger 4 a separation unit 13 an absorption chiller 14 arranged. The separation unit 13 the absorption chiller 14 is traversed by the exhaust stream AG.

The absorption chiller 14 includes a coolant circuit 15 with guided coolant K1 and a refrigerant circuit 16 with refrigerant K2 guided in it.

The coolant K1 is by means of a in the coolant circuit 15 disposed Coolant pump 17 promoted, takes by means of the heat exchanger 18 Loss of heat to be cooled area or item on and gives them in an evaporator 19 to the in the refrigerant circuit 16 located refrigerant K2 from.

To a volume compensation, which is necessary due to volume changes of the coolant K1 at different temperatures, is a surge tank 20 in the coolant circuit 15 arranged.

To the degree of cooling in the heat exchanger 18 to control is in the illustrated embodiment of the invention, for example, a three-way valve 21 provided by means of which individual sections of the coolant circuit 15 from each other and in particular from the evaporator 19 are separable.

In the refrigerant circuit 16 circulates at least partially a refrigerant solution K2 + L, which is formed from a refrigerant K2, preferably ammonia or water and a solvent L, preferably water or lithium bromide.

To realize the functional principle of the absorption chiller 14 includes the refrigerant circuit 16 a refrigerant pump 22 , which is in particular a high-pressure pump, by means of which the separation unit 13 the coolant solution K2 + L can be supplied.

The separation unit 13 is with the exhaust pipe 5 coupled or for example integrated into this and is flowed through by the hot exhaust gas flow AG and heated.

Using one of the refrigerant solution K2 + L in the separation unit 13 supplied thermal energy of the exhaust stream AG, the refrigerant K2, for example ammonia, due to a low boiling temperature of the refrigerant solution K2 + L vaporizable and thus of the solvent L, which also after heating in the separation unit 13 present in a liquid state, separable.

Subsequently, the refrigerant K2 via a first supply line 23 a capacitor 24 , which is preferably an air-cooled condenser, can be supplied, in which the refrigerant K2 cools with release of heat and thus can be converted into a liquid state of matter.

Furthermore, the refrigerant circuit comprises 16 in the flow direction after the capacitor 24 arranged evaporator 19 , in which heat absorption takes place an expansion and evaporation of the refrigerant K2.

The desired cooling effect of the absorption chiller 14 is thus by means of the evaporator 19 reached. For this reason, the coolant circuit 15 and the refrigerant circuit 16 by means of the evaporator 19 thermally coupled such that the refrigerant K2 absorbs the heat of the coolant K1.

In the flow direction after the evaporator 19 is an absorber 25 arranged, to which the refrigerant K2 can be fed. Between the separation unit 13 and the absorber 25 is a second supply line 26 arranged, by means of which the absorber 25 that in the separation unit 13 from the refrigerant solution K2 + L separate solvent L can be fed.

In the illustrated embodiment of the invention is in front of the absorber 25 in addition a jacket pipe 27 arranged, by means of which in particular the solvent L even before entering the absorber 25 is coolable. The cooled solvent L and the refrigerant K2 are together the absorber 25 fed.

The cold solvent L tends to absorb the refrigerant K2 to saturation, so after the absorber 25 again the refrigerant solution K2 + L is present, which is the separation unit 13 by means of the refrigerant pump 22 can be fed.

In operation of the device 1 is by means of the turbine 7 the waste heat recovery device 3 from at least a subset of the thermal energy of the exhaust stream AG of the internal combustion engine 2 generates mechanical energy. The generated mechanical energy is generated by means of the coupling 10 and the gear 11 on the flywheel 12 the internal combustion engine 2 transferred and is there, for example, for the vehicle drive available.

After exiting the exhaust gas heat exchanger 4 the exhaust gas flow AG is within the exhaust pipe 5 the separation unit 13 fed. When entering the separation unit 13 the absorption chiller 14 has the exhaust gas heat exchanger 4 the waste heat recovery device 3 leaving exhaust gas flow AG in particular such a thermal energy, which the operation of the absorption chiller 14 allows.

By means of the absorption chiller 14 becomes the environment of the heat exchanger 18 withdrawn thermal energy. This results in a temperature reduction or cooling of this environment. By means of the heat exchanger 18 Thus, an unrepresented vehicle interior, a cargo space of the vehicle, a power storage and / or a control unit can be cooled or air-conditioned.

2 shows one to 1 very similar construction of the device 1 but with the difference that the internal combustion engine 2 Part of a conventional serial hybrid propulsion device which is at least the internal combustion engine 2 and a generator coupled thereto 28 includes.

In place of the heat exchanger 18 the absorption chiller 14 is a power storage 29 in the coolant circuit 15 arranged. This power storage 29 is electric with the generator 28 coupled and acted upon by this with electrical energy.

At the power storage 29 it is, for example, a high-voltage battery, which is provided for example as a vehicle battery for a vehicle with hybrid drive.

Such a vehicle battery is formed in a manner not shown from a plurality of electrically parallel and / or serially interconnected individual cells, which are preferably arranged as a cell assembly in a cooled or flowed through by the coolant K1 battery housing.

As the power storage 29 during operation, in particular during a charging and / or discharging process, generates large amounts of waste heat, is the power storage 29 thermally with the coolant circuit 15 coupled.

Such a power storage 29 For example, it can also be a capacitor.

Not shown in detail by means of the absorption chiller 14 a control unit of a hybrid vehicle to be cooled. Within such a control unit, in particular a so-called power electronics generates a large amount of waste heat. In order to enable reliable operation of the control unit, it is necessary to dissipate this amount of waste heat. This is by means of the absorption chiller 14 without additional energy expenditure, since the operation of the absorption chiller 14 required thermal energy is advantageously removed from the existing exhaust stream AG.

3 shows one to 2 very similar construction of the device 1 , but with the difference that the separation unit 13 the absorption chiller 14 with the radiator 8th the waste heat recovery device 3 thermally coupled. Thus, the operation of the absorption chiller 14 Required thermal energy from the Joule cycle JK of the waste heat recovery device 3 taken, advantageously at the same time the working medium AM of the waste heat recovery device 3 is cooled.

In a particularly advantageous embodiment, the separation unit 13 the absorption chiller 14 and the radiator 8th the waste heat recovery device 3 designed as an integrated unit.

To the highest possible efficiency of the internal combustion engine 2 A re-cooling of the working medium AM of the Joule process JK is required to implement downstream closed Joule process JK, which can be realized particularly advantageous in that the recooling of the working medium AM as in 3 represented by the heating of the separation unit 13 the absorption chiller 14 he follows.

4 shows one to 2 very similar construction of the device 1 , but with the difference that the closed Joule cycle JK of the waste heat recovery device 3 a Clausius-Rankine cycle CK is connected downstream.

In detail, the recooling of the working medium AM of the Joule cycle JK in this embodiment takes place via the Joule cycle JK downstream Clausius-Rankine cycle CK. The Clausius-Rankine cycle CK and the Joule cycle JK are by means of the cooler 8th thermally coupled. Due to the heat transfer from the Joule cycle JK (recooling) to the Clausius-Rankine cycle CK (preheating), a working medium AT in the cooler is guided in the Clausius-Rankine cycle CK 8th evaporates or at least evaporates and overheats. The cooler 8th For this purpose, it is designed as a recooler / evaporator, which is arranged on the primary side in the Joule cycle JK and on the secondary side in the Clausius-Rankine cycle CK. The overheated or vaporized working fluid AT then becomes the Clausius-Rankine cycle CK of an expansion machine 30 fed, in which the working fluid AT is expanded and thereby cooled.

The expansion machine 30 is in particular designed as a steam turbine or another steam expansion machine and by means of a further coupling 31 separable with a gear 32 coupled with the flywheel 12 the internal combustion engine 2 engaged. Thus, the means of the expansion machine 30 generated mechanical energy for vehicle drive usable.

That from the expansion machine 30 escaping agent AT is in a condenser 33 condensed and then again in liquid form by means of a feed pump 34 the radiator 8th fed.

That from the condenser 33 Escaping, liquid work equipment AT is before the. Entry into the cooler 8th by means of the feed pump 34 increased to a corresponding pressure level. The working medium AT of the Rankine cycle CK is a liquid, in particular organic and / or inorganic, in particular hydrocarbon-containing working medium, such as. As methanol, ethanol, ammonia, ethers, other liquids and / or solutions of these. That is, it does not use water, but for example, a freezer-compatible hydrocarbon-containing working fluid, which is typically up to about 400 ° C resistant.

The in the expansion machine 30 generated mechanical energy is by means of the coupling 31 and the gear 32 the flywheel 12 the internal combustion engine 2 fed.

The feed pump 34 can be engine operated as shown. For this purpose, for example, an electric motor 35 provided that the feed pump 34 drives.

The closed Joule cycle JK and this downstream Clausius-Rankine cycle CK are interconnected so that this is as simple and compact and allows use of the thermal energy of the exhaust stream AG on a very wide range of existing temperature levels, resulting in a high overall efficiency of the entire drivetrain or the overall aggregate leads.

5 shows one to 1 very similar construction of the device 1 but with the difference that in 5 In addition, a cooling circuit KK (dashed line) with a pump 36 , z. B. a coolant pump, the internal combustion engine 2 is shown. Furthermore, the cooling circuit KK comprises at least one conventional vehicle radiator 37 and another three-way valve 38 ,

A refrigerant preheater 39 , Which flows through the primary side of the refrigerant solution K2 + L and secondary side of the guided in the cooling circuit KK coolant KM, couples the cooling circuit KK thermally with the absorption chiller 14 , The refrigerant preheater 39 is in the refrigerant circuit 16 between separation unit 13 and absorbers 25 arranged.

By means of the coolant KM carried in the cooling circuit KK, the refrigerant solution K2 + L of the refrigerant circuit 16 before entering the separation unit 13 preheated.

Thus, in the coolant KM of the internal combustion engine 2 accumulating thermal energy for preheating the refrigerant solution K2 + L in the refrigerant circuit 16 the absorption chiller 14 used before the refrigerant solution K2 + L of the separation unit 13 is supplied.

By means of the three-way valve 38 is at least a partial flow of the heated coolant KM of the cooling circuit KK of the internal combustion engine 2 branchable and the refrigerant preheater 39 fed.

The inlet temperature of the exhaust stream AG, with which the separation unit 13 is heated, is above the outlet temperature of the coolant KM from the internal combustion engine 2 , By using the waste heat of the internal combustion engine 2 , which in the coolant KM of the internal combustion engine 2 is transported, can be particularly high cooling capacities with the absorption chiller 14 achieve.

LIST OF REFERENCE NUMBERS

1

contraption

2

Internal combustion engine

3

Waste heat recovery device

4

Exhaust gas heat exchanger

5

exhaust pipe

6

compressor

7

turbine

8th

cooler

9

wave

10

clutch

11

gear

12

flywheel

13

separation unit

14

Absorption chiller

15

Coolant circuit

16

Refrigerant circulation

17

Coolant pump

18

heat exchangers

19

Evaporator

20

surge tank

21

Three-way valve

22

Refrigerant pump

23

first supply line

24

capacitor

25

absorber

26

second supply line

27

casing pipe

28

generator

29

power storage

30

expander

31

clutch

32

gear

33

capacitor

34

feed pump

35

electric motor

36

pump

37

vehicle radiator

38

Three-way valve

39

Kältemittelvorwärmer

AT

work equipment

AT THE

working medium

AG

exhaust gas flow

CK

Rankine Cycle

JK

Brayton cycle

K1

coolant

K2

refrigerant

L

solvent

K2 + L

Refrigerant solution

KK

Cooling circuit

KM

coolant

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008041363 A1 [0006]
• US 7650761 B2 [0007]

Claims (9)

Method for using waste heat from an exhaust gas stream (AG) of an internal combustion engine ( 2 ) in a vehicle having an absorption chiller ( 14 ), characterized in that - the exhaust gas stream (AG) at least one exhaust gas heat exchanger ( 4 ) of a waste heat recovery device ( 3 ) and then - the exhaust gas flow (AG) and / or a waste heat flow of the waste heat recovery device ( 3 ) of the absorption chiller ( 14 ) is supplied. Method according to claim 1, characterized in that in the waste heat recovery device ( 3 ) a working medium (AM) in a closed Joule cycle (JK) is performed, which from the exhaust gas heat exchanger ( 4 ), a turbine ( 7 ), one between the turbine ( 7 ) and a compressor ( 6 ) arranged cooler ( 8th ) and the compressor ( 6 ) is formed. A method according to claim 2, characterized in that the closed Joule cycle (JK) is followed by a Clausius-Rankine cycle (CK) such that the Joule cycle (JK) and the Clausius-Rankine cycle (CK) by means of Cooler ( 8th ) are thermally coupled and the working medium (AM) of the Joule cycle is cooled. Method according to one of the preceding claims, characterized in that by means of the turbine ( 7 ) of the waste heat recovery device ( 3 ) From at least a subset of the thermal energy of the exhaust stream (AG) mechanical energy is generated. Method according to Claim 4, characterized in that the absorption refrigerating machine ( 14 ) is operated. Method according to claims 1 and 5, characterized in that one in the absorption chiller ( 14 ) guided refrigerant (K2) heat energy of a coolant (KM) of the internal combustion engine ( 2 ) is supplied. Method according to claims 1 and 5, characterized in that by means of the absorption chiller ( 14 ) a vehicle interior, a cargo hold, a power storage ( 29 ) and / or a control unit is cooled or air-conditioned. Contraption ( 1 ) for the use of waste heat from an exhaust gas stream (AG) of an internal combustion engine ( 2 ) in a vehicle having an absorption chiller ( 14 ), characterized in that - a waste heat recovery device ( 3 ) thermally with an exhaust pipe ( 5 ) and - an absorption chiller ( 14 ) thermally with an exhaust pipe ( 5 ) and / or a waste heat stream of the waste heat recovery device ( 3 ) is coupled. Contraption ( 1 ) according to claim 8, characterized in that a cooling circuit (KK) of the internal combustion engine ( 2 ) and the absorption chiller ( 14 ) are thermally coupled.

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