| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot water supply device having an improved coefficient of performance (COP) by operating a heat pump in a more optimal condition. <P>SOLUTION: An environment load Qk is computed in accordance with external conditions depending on an outside air temperature Ta and an incoming water temperature Twi, and a target rotating number RN of a compressor 11 is set properly corresponding to a value for the found environment load Qk. Particularly, as the outside air temperature Ta is lower or as the incoming water temperature Twi is higher, the target rotating number RN of the compressor 11 is set to be a higher value. <P>COPYRIGHT: (C)2007,JPO&INPIT |
