| 摘要 |
PROBLEM TO BE SOLVED: To improve a heat pump device so that a defrost operation is promptly finished.SOLUTION: A heat pump device is constituted by comprising: a heat pump unit in which a cooling medium circulates in order of a compressor, a heat exchanger, an expansion valve and an evaporator; a tank which stores a heating medium subjected to heat exchange by the heat exchanger; a circulation pump which makes the heating medium of the tank pass through a load to be circulated; and a defrost control unit which executes a defrost operation for circulating the cooling medium as hot gas in a state that the expansion valve is fully opened, an evaporation operation of the evaporator is stopped, and heating medium circulation by the circulation pump is stopped (S1), when a defrost starting condition is established (S0). The defrost control unit controls the circulation pump so that the cooling medium and the heating medium perform the heat exchange by the heat exchanger (S4) when the cooling medium and the heating medium become predetermined temperature relation during the defrost operation (S2). Temperature is maintained by collecting heat of the heating medium to the cooling medium to promptly finish the defrost operation. |
