| 摘要 |
PROBLEM TO BE SOLVED: To improve the air-conditioning efficiency by providing at least two devices to raise the temperature of an air-conditioning circuit and at least two device to drop the temperature of the air-conditioning circuit, and connecting the temperature raising device or the temperature dropping device to the air-conditioning circuit according to the running condition and the temperature. SOLUTION: An air-conditioning circuit for an electric car having a fuel cell 25 is provided with a refrigerant pump 2 to feed the refrigerant to a first temperature raising device 10 which is a power output stage. A second temperature raising device 20 which is a heat exchanger is provided in a fuel cell cooling circuit 200 in a switching manner in series to the first temperature raising device 10. When the car is started, the fuel cell 25 is not cooled, and the refrigerant flows in a bypass line to bypass the second temperature raising device 20 through a valve 16. A first temperature dropping device 40 which is a heat exchanger to heat a passenger cabin is provided on a downstream side of the second temperature raising device 20, and a second temperature dropping device 50 such as a radiator is arranged on its downstream side. |
