| 摘要 |
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.
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