초록 ▼

The invention relates to an air-conditioning unit (10) for a motor vehicle with a heating heat transfer unit (28) connected to a coolant circuit (42) in an internal combustion engine and comprising an evaporator (22) installed upstream in the direction of flow of a fan (36). A compressor (12) in a r

The invention relates to an air-conditioning unit (10) for a motor vehicle with a heating heat transfer unit (28) connected to a coolant circuit (42) in an internal combustion engine and comprising an evaporator (22) installed upstream in the direction of flow of a fan (36). A compressor (12) in a refrigerant circuit (32) pumps a refrigerant through a gas cooler (16) and an expansion valve (20) during a cooling operation, and pumps said refrigerant to the evaporator (22) via the expansion valve (20) by by-passing the gas cooler (16) during a heating operation. A coupled heat exchanger (30) is provided between the coolant circuit (42) and the refrigerant circuit (32). The invention provides that the coupled heat exchanger (30) is located in the refrigerant circuit (32) on the pressure side of the compressor (12) upstream of the gas cooler (16), a first by-pass line (80) is provided parallel to the gas cooler (16) and the flow through the gas cooler (16) and the first by-pass line (80) is controlled by a switching valve (52) in the first by-pass line (80) and a switching valve (48, 50) located at each of the inlet and outlet of the gas cooler (16), depending on operating parameters, and a heat transfer unit (14) for a medium in a unit in the refrigerant circuit (32) is connected behind an expansion valve (20 or 38) and serves as heat source in heating operation.

대표청구항 ▼

1. An air-conditioning unit (10) for a motor vehicle with a heating heat transfer unit (28) connected to a coolant circuit (42) of an internal combustion engine and comprising an evaporator (22) installed upstream as viewed in the direction of flow of a fan (36), whereby a compressor (12) in a refri

1. An air-conditioning unit (10) for a motor vehicle with a heating heat transfer unit (28) connected to a coolant circuit (42) of an internal combustion engine and comprising an evaporator (22) installed upstream as viewed in the direction of flow of a fan (36), whereby a compressor (12) in a refrigerant circuit (32) pumps refrigerant through a gas cooler (16) and an expansion valve (20) during a cooling operation and pumps said refrigerant to the evaporator (22) via the expansion valve (20) by by-passing the gas cooler (16) during a heating operation, and whereby a coupled heat exchanger (30) is provided between the coolant circuit (42) and the refrigerant circuit (32),wherein the coupled heat exchanger (30) is located in the refrigerant circuit (32) on the pressure side of the compressor (12), a first by-pass line (80) is provided parallel to the gas cooler (16) and the flow through the gas cooler (16) and the first by-pass line (80) is controlled by a switching valve (52) in the first by-pass line (80) and one switching valve (48, 50) each located at the inlet and outlet of the gas cooler (16), depending on operating parameters, and a heat transfer unit (14) for a medium in a unit in the refrigerant circuit (32) is connected behind an expansion valve (20 or 38) and serves as heat source in heating operation. 2. The air-conditioning unit (10) according to claim 1,wherein the heat transfer unit (14) is located in a second by-pass line (82) parallel to the evaporator (22). 3. The air-conditioning unit (10) according to claim 2,wherein a second expansion valve (38) is located in the second by-pass line (82) in front of the heat transfer unit (14). 4. The air-conditioning unit (10) according to claim 2,wherein the second by-pass line (82) branches off in the direction of flow of the coolant downstream of the first expansion valve (20), and a three-way valve (56) is located at the branching-off point. 5. The air-conditioning unit (10) according to claim 1,wherein a valve (38, 56) is provided that can decouple the heat transfer unit (14) from the refrigerant circuit (32) either entirely or partially. 6. The air-conditioning unit (10) according to claim 1,wherein the heat transfer unit (14) serves to cool the medium of boost air (40) from a supercharger. 7. The air-conditioning unit (10) according to claim 1,wherein the coolant is a medium with which heat is given off with supercritical pressure. 8. The air-conditioning unit (10) according to claim 7,wherein the coolant is carbon dioxide. 9. The air-conditioning unit (10) according to claim 1,wherein the switching valve (50) located at the outlet of the gas cooler (16) is configured as a non-return valve. 10. The air-conditioning unit (10) according to claim 1,wherein a hot-gas valve (44) is provided in the refrigerant circuit (32) upstream of the coupled heat exchanger (30). 11. The air-conditioning unit (10) according to claim 10,wherein a third by-pass line (84) branches off upstream of the hot-gas valve (44) which said third by-pass line bridges the coupled heat exchanger (30) and comprises a switching valve (46). 12. The air-conditioning unit (10) according to claim 1,wherein the heat transfer unit (14) is configured as a triple heat transfer unit, and cooling air (58) flows through it. 13. The air-conditioning unit (10) according to claim 12,wherein the cooling air flow (58) through the heat transfer unit can be restricted or closed off using a flap (76). 14. The air-conditioning unit (10) according to claim 1,wherein the heat transfer unit (14) is fabricated as a microstructure. 15. The air-conditioning unit (10) according to claim 13,wherein the heat transfer unit (14) comprises cooling-air ducts (74) that share common walls (90) with boost-air ducts (88), whereby the common walls (90)?together with flat tubes (70) that comprise refrigerant ducts (72)?form the boost-air ducts (88). 16. The air-conditioning unit (10) according to claim 15,wherein fins (68) are located in the boost-air ducts (88).