| 摘要 |
PROBLEM TO BE SOLVED: To improve efficiency of a feedwater heating system applying a heat pump driven by an engine, and to effectively utilize exhaust heat from the engine.SOLUTION: A heat pump 2 pumps up heat from a heat source fluid in an evaporator 8, and heats water of a water supply passage 4 in a condenser 6. An engine 3 drives a compressor 5 of the heat pump 2. The water in the water supply passage 4 is successively passed through a waste heat recovery heat exchanger 10, a subcooler 9 and the condenser 6. The waste heat recovery heat exchanger 10 is an indirect heat exchanger between the feedwater in the water supply passage 4 and the heat source fluid after passing through the evaporator 8. The subcooler 9 is an indirect heat exchanger between the feedwater in the water supply passage 4 and a refrigerant from the condenser 6 to an expansion valve 7. A jacket heat exchanger 16 for heating the water after passing through the condenser 6 by exhaust heat in jacket cooling of the engine 3, and an exhaust gas heat exchanger 17 for heating the same by an exhaust gas from the engine 3, may be further disposed. |
