| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump type heating hot water supply device for restricting COP aggravation when a compressor is being controlled to decrease outgoing temperature.SOLUTION: As a case in which an engine speed R of a compressor is decreased, it might be assumed that an outgoing temperature Tg is more than an upper limit temperature Tt1. In this case, although it is necessary to decrease the outgoing temperature Tg down to a target temperature T, if the engine speed R of a compressor is decreased to a value less than the minimum engine speed Rm, COP is aggravated. At this time, if the engine speed R of a compressor becomes an engine speed of compressor (the minimum engine speed Rd) lower than an optimal engine speed Rm by a prescribed rate, a compressor 1 is stopped. For example, if the engine speed R of the compressor is decreased at each of surrounding temperatures To1, To2 to get the lower limit engine speeds Rd1, Rd2 lower than the minimum engine speeds Rm1, Rm2 by 10%, the compressor 1 is stopped. With this arrangement, aggravation of COP can be restricted while the outgoing temperature Tg is being decreased. |
