| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve both of COP in a direct heating operation and COP in a high-temperature hot water storage operation, in a heat pump type hot water supply heating device. <P>SOLUTION: Intermediate-temperature direct heating is executed when a H/P water supply temperature T1 is lower than a reference water supply temperature, and high-temperature direct heating is executed when the H/P water supply temperature T1 is higher than the reference water supply temperature in the direct heating operation. When the H/P water supply temperature T1 is low, COP can be increased by lowering a boiling-up temperature. When the H/P water supply temperature T1 is high, the boiling-up temperature is increased as the COP difference with respect to high and low boiling-up temperatures is small when the H/P water supply temperature T1 is high. Thus the hot water is stored in a hot water storage tank 5 in the direct heating operation, and a ratio of the water of intermediate temperature is decreased. As the ratio of the water of intermediate temperature in the hot water storage tank 5 is decreased, COP can be increased in performing the high temperature hot water storage operation. Further as the ratio of hot water in the hot water storage tank 5 is increased, power consumption in the high temperature hot water storage operation can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT |
