| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot water supply device saving energy.SOLUTION: A control device 40 of this hot water supply device 100 includes a target hot water amount setting means 41 for setting a third target hot water amount of a hot water storage tank 30 at a prescribed time on the basis of a first target hot water amount at a termination time of a prescribed period, and a second target hot water amount at a start time, an index calculating means 43 for calculating an index on the basis of an amount of hot water detected by a water level sensor 31 at the prescribed time, and the third target hot water amount and the first target hot water amount at the prescribed time, a necessary water amount calculating means 42 for calculating the necessary water amount on the basis of the index, a necessary heating capacity calculating means 44 for calculating a necessary heating capacity of a heat pump unit on the basis of the necessary water amount, a set temperature and the water temperature detected by a temperature sensor 5, and a rotational frequency setting means 45 for setting a rotational frequency of a compressor 21 on the basis of the necessary heating capacity. The rotational frequency of the compressor 21 is set each prescribed time interval to control the compressor 21. |
