| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption by adjusting a set temperature, in a feedwater heating system for heating feedwater to a water supply tank through a water supply passage to the set temperature by a heat pump.SOLUTION: A heat pump 4 pumps up heat from a heat source fluid passing through an evaporator 15, and heats water passing through a condenser 13. Water can be supplied to a water supply tank 3 from a water supply passage 8 through the heat pump 4, and further water can be supplied thereto from a makeup water passage 9 without passing through the heat pump 4. The heat pump 4 is operated during water supply to the water supply tank 3 through the water supply passage 8, and a water passing amount to the condenser 13 is adjusted to keep an outlet-side water temperature of the condenser 13 of the heat pump 4 to a set temperature. The set temperature is adjusted on the basis of a detection temperature of a second temperature sensor 23 disposed in the water supply passage from the water supply tank 3 to a boiler 2. |
