Patent ID: 6948319

Claim:
A cogeneration system that includes a prime mover ( 8 ) for obtaining power for driving a generator ( 9 ) by combustion of a fuel, a waste heat boiler ( 10 ) for recovering thermal energy from exhaust gas discharged from the prime mover ( 8 ), and an air-heating heat exchanger ( 5 ) for heating air that is to be fed into an air conditioner ( 30 ) by heat exchange with the exhaust gas discharged from the waste heat boiler ( 10 ), characterized in that the system comprises drain water recovery/supply means ( 36 ) capable of recovering drain water generated from the exhaust gas cooled by heat exchange in the air-heating heat exchanger ( 5 ) with the air that is to be fed into the air conditioner ( 30 ) and supplying the drain water thus recovered to an appliance ( 37 , 38 ) that requires comparatively high temperature water.