REFRIGERATION ARRANGEMENT FOR A MOTOR VEHICLE

Abstract

A refrigeration arrangement for traction vehicles includes a first closed circuit configured as a compression refrigeration machine containing a refrigerant as a first carrier medium, evaporator and condenser. The evaporator absorbs heat into the first circuit. The condenser transfers heat from the first circuit. The first circuit is coupled, via the evaporator, to a closed second circuit containing a liquid second carrier medium for heat transport. The second circuit, for cooling, takes heat and transfers it to the second carrier medium. The heat is conveyed, by the second carrier medium, to the evaporator for transfer to the first circuit. The first circuit is coupled, via the condenser, to a closed third circuit containing a liquid third carrier medium for heat transport. The third circuit causes heat from the first circuit, transferred into the third circuit by the condenser, to be transferred to surroundings with heat from traction systems.

Claims

1-13. (canceled)

14. A refrigeration arrangement for a traction vehicle, the refrigeration arrangement comprising: a closed first circuit configured as a compression refrigeration machine including a refrigerant as a first carrier medium, an evaporator configured as a liquid-liquid heat exchanger, a condenser configured as a liquid-liquid heat exchanger, a compressor, and a restrictor, said first carrier medium passing from said evaporator through said compressor to said condenser and from said condenser through said restrictor back to said evaporator; a closed second circuit including said evaporator, a compressor, a fan, a heat exchanger and a liquid second carrier medium for transporting heat, said second carrier medium passing from said heat exchanger through said compressor to said evaporator and from said evaporator back to said heat exchanger of said second circuit; a closed third circuit including said condenser, a first heat exchanger, a second heat exchanger, a liquid third carrier medium for transporting heat, and a compressor, said third carrier medium passing from said condenser through said compressor to said second heat exchanger and from said second heat exchanger through said first heat exchanger back to said condenser; said second circuit being coupled by said the evaporator to said first circuit; said first circuit being coupled by said the condenser to said third circuit; said second circuit configured to cause, for cooling purposes, heat to be extracted at a predetermined location and transferred to said second carrier medium, the heat being carried by said second carrier medium to said evaporator for transferring heat to said first circuit; said first circuit configured to cause heat to be transferred by said evaporator to said first carrier medium and passed by said first carrier medium to said condenser for releasing heat to said third circuit; said second heat exchanger of said third circuit configured for cooling traction systems of the traction vehicle and for supplying heat of the traction systems to said third carrier medium; and said third circuit configured to transfer heat of said first circuit through said condenser to said third carrier medium and to transfer heat, together with the heat of the traction systems, through said first heat exchanger to the environment.

15. The arrangement according to claim 14, wherein said second circuit is configured, for cooling purposes, to extract heat from at least one of a component of the traction vehicle or a passenger compartment of the traction vehicle or air in the passenger compartment.

16. The arrangement according to claim 15, wherein said second circuit is configured to use said heat exchanger of said second circuit to extract heat from at least one of the component or the air in the passenger compartment and transfer the heat to said second carrier medium.

17. The arrangement according to claim 14, wherein: said heat exchanger of said second circuit is configured as an air-liquid heat exchanger; said first heat exchanger of said third circuit is configured as a liquid-air heat exchanger; and said second carrier medium and said third carrier medium are water with or without an added antifreeze agent.

Description

[0064] The present invention will be discussed in more detail below, by way of an example, on the basis of a drawing in which:

[0065] FIG. 1 shows the arrangement according to the invention in a schematic circuit diagram, and

[0066] FIG. 2 shows the use, discussed in the introductory part of the description, of a compression refrigeration machine for the air-conditioning of a rail vehicle.

[0067] FIG. 1 shows the arrangement according to the invention in a schematic circuit diagram.

[0068] The compression refrigeration machine KKM has, as main components, a compressor 1, a condenser 2, a restrictor 3, an evaporator 4 and a carrier medium KM1.

[0069] The carrier medium KM1 is used to transport cold or heat within the first circuit.

[0070] The carrier medium KM1, which has the function of a refrigerant, moves in the closed first circuit composed of the abovementioned main components.

[0071] The carrier medium KM1 undergoes various changes in state of aggregation in succession. The carrier medium KM1 of the first circuit will hereinafter also be referred to as first carrier medium KM1.

[0072] The gaseous first carrier medium KM1 is compressed by means of the compressor 1 and conducted to the downstream condenser 2.

[0073] In the condenser 2, the first carrier medium KM1 condenses or liquefies and releases heat.

[0074] The liquid first carrier medium KM1 passes to the restrictor 3 that is connected downstream of the condenser 2.

[0075] Owing to a change in pressure, the liquid first carrier medium KM1 is expanded across the restrictor 3 and passes to the evaporator 4 that is connected downstream of the restrictor 3.

[0076] In the evaporator 4, the first carrier medium KM1 evaporates, absorbing heat at relatively low temperature.

[0077] By means of the evaporator 4, the first carrier medium KM1 absorbs heat from a second circuit, which is likewise closed and contains a carrier medium KM2. The evaporator 4 is designed as a liquid-liquid heat exchanger.

[0078] The evaporator 4 is incorporated into the second circuit composed of a compressor 5, a fan 6, a heat exchanger 7 and the carrier medium KM2.

[0079] The carrier medium KM2, which has the function of a refrigerant or heat carrier, and which is for example a liquid coolant, moves in the closed second circuit composed of the abovementioned components.

[0080] Here, the carrier medium KM2 does not undergo any changes in state of aggregation.

[0081] The fan 6 transports air 12, which is drawn in from a usable space (for example a passenger compartment, the driver's station of the traction vehicle or rail vehicle, etc.), through the heat exchanger 7.

[0082] The heat exchanger 7 is designed as an air-liquid heat exchanger and cools the air 12 supplied to it, by extracting the heat of said air and transferring said heat to the carrier medium KM2 of the second circuit.

[0083] The carrier medium KM2 of the second circuit will hereinafter be referred to as second carrier medium KM2.

[0084] The warmed second carrier medium KM2 passes, with the aid of the compressor 5, from the heat exchanger 7 to the evaporator 4.

[0085] As discussed, the evaporator 4 extracts heat from the second carrier medium KM2, such that, ultimately, the second carrier medium KM2 is cooled.

[0086] The cooled second carrier medium KM2 is supplied to the heat exchanger 7 and is used there for cooling, or for extracting heat from, the supplied air 12.

[0087] According to the invention, the condenser 2 of the compression refrigeration machine is designed as a liquid-liquid heat exchanger and is incorporated into a third circuit.

[0088] The third circuit in turn is provided in the traction vehicle in order to cool traction systems there.

[0089] The third circuit comprises a compressor 8, a fan 11, a heat exchanger 10 and a carrier medium KM3 in addition to the condenser 2.

[0090] The heat exchanger 10 is designed as a liquid-air heat exchanger.

[0091] The third circuit furthermore comprises a further heat exchanger 9, which is coupled to traction systems of the traction vehicle. By means of said further heat exchanger, heat of the traction systems is transferred to the carrier medium KM3 of the third circuit.

[0092] The carrier medium KM3 of the third circuit will hereinafter be referred to as third carrier medium KM3.

[0093] The third carrier medium KM3, which has the function of a refrigerant or heat carrier, and which is for example a liquid coolant, moves in the closed third circuit composed of the abovementioned components.

[0094] Here, the third carrier medium KM3 does not undergo any changes in state of aggregation.

[0095] The heat of the first circuit that is released via the condenser 2 is supplied to the third carrier medium KM3, which passes via the compressor 8 to the heat exchanger 9.

[0096] There, the third carrier medium KM3 absorbs further heat of the traction systems and is supplied to the heat exchanger 10.

[0097] By means of the fan 11, ambient air is supplied to the heat exchanger 10, which is designed as a liquid-air heat exchanger.

[0098] By means of the heat exchanger 10, the heat of the third carrier medium KM3 is transferred to the ambient air and thus removed from the third carrier medium KM3, which cools again and passes to the condenser 2 again.

[0099] In summary, in the second circuit, heat is extracted from the air 10 and transported to the evaporator 4. By means of the evaporator 4, the heat is transferred from the first circuit to the second circuit and transported to the condenser 2.

[0100] By means of the condenser 2, the heat is transferred from the first circuit to the third circuit and is transported to the heat exchanger 10.

[0101] By means of the heat exchanger 10, the heat is released to the environment, in particular to the ambient air.