| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat pump water heater capable of reducing a discharge pressure and lowering a discharge temperature of a compressor of a refrigerant circuit, and preventing pressure rise. <P>SOLUTION: This heat pump water heater has a refrigerant circuit constituted by successively connecting a compressor 31, a heat exchanger 32 for hot water supply, a throttling device 33 capable of controlling a flow rate by variably changing a throttle opening, and an evaporator 34, and a hot water supply circuit connected with the heat exchanger 32 for hot water supply, further has a discharge temperature sensor 54 detecting a temperature of a discharged refrigerant of the compressor 31, an inflow water temperature sensor 51 detecting a temperature of the water flowing into the heat exchanger 32 for hot water supply, a supply hot water temperature sensor 52 for detecting the supplied hot water flowing out from the heat exchanger 32 for hot water supply, an outside air temperature sensor 53 detecting an outside air temperature, and a control device 55 controlling an opening of the throttling device 33, and the opening of the throttling device 33 is determined by the control device 55 on the basis of detection values of these sensors. <P>COPYRIGHT: (C)2007,JPO&INPIT |
