| 摘要 |
PROBLEM TO BE SOLVED: To improve an operating efficiency and a durability. SOLUTION: A heat pump hot-water supplier is constituted of a refrigerant circulation circuit consisting of a compressor 1, a heat exchanger 2 between refrigerant and water, a pressure reducing device 3 and an evaporator 4 which are connected sequentially, a hot-water supplying circuit consisting of a hot-water storage tank 5, a circulation pump 6 and the heat exchanger 2 between refrigerant and water which are connected sequentially, an outdoor air temperature detecting means 12 for detecting an outdoor air temperature, a discharging temperature detecting means 13 for detecting the discharging temperature of the compressor 1, and a control means 11 for controlling the opening degree of the pressure reducing device 3 so that the discharging temperature of the compressor will arrive at an objective discharging temperature preset with respect to the outdoor air temperature. The control means 11 is provided with a non-sensitive time band, in which the opening degree of the pressure reducing device 3 is kept in constant, upon starting the compressor 1, whereby the delay of rise of a temperature with respect to the pressure of the compressor 1 under a transient condition upon starting the same is waited, thereby improving the efficiency of operation upon starting and realizing a heat pump hot-water supplier high in the durability of the same. |
