| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed water heating system using heat pumps in which the COP is enhanced of heat pumps.SOLUTION: A feed water to a water tank 3 via a supply channel 8 passes through in order an exhaust heat recovery heat exchanger 12, a supercooling machine 17, and a condenser 14. A heat source fluid, such as heat source water, is forced to pass through in order an evaporator 16 and an exhaust heat recovery heat exchanger 12. The exhaust heat recovery heat exchanger 12 is an indirect heat exchanger between the feed water to the water tank 3 via the supply channel 8 and the heat source fluid after passing through the evaporator 16. The supercooling machine 17 is an indirect heat exchanger between the feed water to the water tank 3 via the supply channel 8 and a coolant flowing from the condenser 14 to an expansion valve 15. It is recommended that during the time when feed water is sent to the water tank 3 via the supply channel 8, while operating the heat pump 4, the passing water amount to the condenser 14 is regulated to maintain the water temperature at the exit side of condenser 14 of the heat pump 4 to a preset temperature. |
