| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot water storage type hot water supply heating device capable of preventing increase of fluid for hot water supply of intermediate temperature in a hot water storage tank by a heating device and improving COP of a heat pump heat source machine. <P>SOLUTION: A control device 40 comprises a hot water storage amount calculating means 40a for calculating the hot water storage amount in a hot water storage tank 11, and a hot water storage variation calculating means 40b for comparing the hot water storage amounts calculated by the hot water storage amount calculating means 40a and calculating the variation ΔQd as the difference between the present hot water storage amount and the last hot water storage amount. A rotational frequency of a compressor 21 is controlled to decrease a heating capacity of the heat pump heat source machine 20 when the variation ΔQd calculated by the hot water storage variation calculating means 40b is increased by a prescribed amount, and the rotational frequency of the compressor 21 is controlled to increase the heating capacity of the heat pump heat source machine 20, when the variation ΔQd calculated by the hot water storage variation calculating means 40b is decreased by the prescribed amount. Thus the increase of the fluid for hot water supply, of the intermediate temperature can be prevented, and COP of the heat pump heat source machine can be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT |
