Patent ID: 7718290

Claim:
A cogeneration system comprising: an electric power generator; a cooling circuit configured to cool said electric power generator with a first heat transfer medium; a heat exchanger provided on said cooling circuit; an exhaust heat recovery circuit through which a second heat transfer medium that exchanges heat with the first heat transfer medium via said heat exchanger flows; a heat storage unit connected to said exhaust heat recovery circuit and configured to store the second heat transfer medium that has undergone the heat exchange by said heat exchanger; and a controller, wherein: a first temperature sensor and a heater to which electric power is supplied from said electric power generator are connected, in this order, downstream of said heat exchanger in a direction in which the second heat transfer medium flows; a circulating pump configured to circulate the second heat transfer medium is further connected to said exhaust heat recovery circuit; and said controller controls a flow rate of said circulating pump so that, based on a temperature detected by said first temperature sensor, the detected temperature approaches a predetermined target temperature.