| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption by driving a compressor by using a steam engine, in a feedwater heating system applying a heat pump.SOLUTION: A heat pump 4 pumps up heat from a heat source fluid passing through an evaporator 16, and heats water passing through a condenser 14. Feedwater to a water supply tank 3 through a water supply passage 9 is successively passed through a waste heat recovery heat exchanger 22, a subcooler 17 and the condenser 14. The waste heat recovery heat exchanger 22 is an indirect heat exchanger between the feedwater to the water supply tank 3 through the water supply passage 9 and the heat source fluid after passing through the evaporator 16. The subcooler 17 is an indirect heat exchanger between the feedwater to the water supply tank 3 through the water supply passage 9 and a refrigerant from the condenser 14 to an expansion valve 15. The water in the water supply tank 3 is supplied to a boiler 2, and the steam from the boiler 2 is supplied to a steam engine 8 to drive a compressor 13. |
