To provide a heat pump unit, simplifying opening and closing operation of a bypass valve and exhibiting a predetermined performance while securing a space for a compressor.
The heat pump unit is equipped with: a refrigerant circuit 1 formed by successively connecting an evaporator 2, a compressor 3, a radiator 4, and a decompression means 5; a water circuit 7 connected to the radiator 4; and a pressure sensor provided in the refrigerant circuit 1, in which the bypass valve 6 is opened and closed based on information of a pressure sensor 8, a discharge temperature sensor 10, an evaporation temperature sensor 11 or the like provided in the refrigerant circuit 1, and refrigerant with the discharge side being in a supercritical state is circulated. According to this, the opening and closing operation of the bypass valve 6 is simplified, and the space for the compressor 3 is secured while the heat pump unit is made compact.
NAKATANI KAZUO
Hiroki Naito
Daisuke Nagano