| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump system that can defrost an outdoor heat exchanger and prevent it from forming frost not by heat externally supplied and without increasing energy consumed for a compressor in a heat pump cycle.SOLUTION: A heater core 23 for exchanging heat between cooling water and air blown into a vehicle is arranged in a high-pressure-side heating medium circulation circuit 21 for circulating cooling water heated in a heat pump cycle 10, and a radiator 24 for exchanging heat between at least a part of cooling water flown from the heater core 23 and low-pressure refrigerant in the heat pump cycle 10 in a low-pressure-side heating medium circulation circuit 22 connected to the high-pressure-side heating medium circulation circuit 21. This can prevent an outdoor heat exchanger 14 from forming frost and defrost frost formed on the outdoor heat exchanger 14 by using excess heat that has not been used to heat blown air obtained by cooling water flown from the heater core 23. |
