Cogeneration system

A cogeneration system comprising:

• a generator;
• an engine operating to drive the generator, and thus, to cause the generator to generate electricity, the engine generating waste heat during the operation of the engine;
• a heat pump type air conditioner including a compressor, a 4-way valve, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger;
• a heater to heat air, which has passed around the indoor heat exchanger after completing heat exchange with the indoor heat exchanger;
• an exhaust gas heat exchanger to absorb heat from exhaust gas discharged from the engine;
• a cooling water heat exchanger to absorb heat from cooling water used to cool the engine;
• a heat medium circulation conduit to guide a heat medium for circulation of the heat medium such that the heat medium passes through the exhaust gas heat exchanger while being heated by the exhaust gas heat exchanger, is fed to the heater to transfer heat to the heater, and is then returned to the exhaust gas heat exchanger;
• and
• a heat medium circulation pump to pump the heat medium for the circulation of the heat medium.

A cogeneration system comprising:

• a generator;
• an engine operating to drive the generator, and thus, to cause the generator to generate electricity, the engine generating waste heat during the operation of the engine;
• a heat pump type air conditioner including a compressor, a 4-way valve, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger;
• a heater to heat air, which has passed around the indoor heat exchanger after completing heat exchange with the indoor heat exchanger;
• a suction-side overheating heat exchanger to heat a refrigerant sucked into the compressor;
• an exhaust gas heat exchanger to absorb heat from exhaust gas discharged from the engine;
• a cooling water heat exchanger to absorb heat from cooling water used to cool the engine;
• and
• a heat transfer unit to transfer heat from the exhaust gas heat exchanger to the heater and to transfer heat from the cooling water heat exchanger to the suction-side overheating heat exchanger.