| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump type air-conditioning system which uses a cooling refrigerant circuit and a heating ventilation and air conditioning unit (HVAC) of a current system, diversifies heat sources of heating to secure cooling/heating ability while achieving simplification of the structure, and enables an operation in a frost formation delay mode etc. during the heating.SOLUTION: In a vehicle air-conditioning system, a refrigerant/heat medium heat exchanger 16 which heats a heat medium circulating in a heater core 8 of a heating ventilation and air conditioning unit (HVAC) 2 is provided in a discharge pipeline 14A of a cooling refrigerant circuit 15. A heating bypass circuit 18 which reaches a receiver 12 through switching means 17 is connected to the downstream side of the refrigerant/heat medium heat exchanger 16. Further, a second circuit 20 having second decompression means 19 in between an outlet of the receiver 12 and one end of a vehicle exterior heat exchanger 11 and a third circuit 22 having an electromagnetic valve 21 in between the other end of the vehicle exterior heat exchanger 11 and a suction circuit 14F are provided. A heating refrigerant circuit 23 is formed by a motor compressor 10, the refrigerant/heat medium heat exchanger 16, the switching means 17, the heating bypass circuit 18, the receiver 12, the second circuit 20, the vehicle exterior heat exchanger 11, and the third circuit 22.SELECTED DRAWING: Figure 1 |
