Cogeneration system

A cogeneration system comprising:

• an engine, which drives a generator to generate electricity;
• a cooling/heating unit, which comprises a compressor, a four-way valve, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger, to establish a heat pump type refrigerant cycle;
• a suction-side refrigerant over-heater to supply heat of cooling water used to cool the engine and heat of exhaust gas discharged from the engine to a suction-side refrigerant line of the compressor of the cooling/heating unit;
• and
• a discharge-side refrigerant over-heater to supply the heat of the exhaust gas discharged from the engine to a discharge-side refrigerant line of the compressor.

A cogeneration system comprising:

• an engine, which drives a generator to generate electricity;
• a cooling/heating unit, which comprises a compressor a four-way valve, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger, to establish a heat pump type refrigerant cycle;
• and
• a suction-side refrigerant over-heater to supply heat of cooling water used to cool the engine and heat of exhaust gas discharged from the engine to a suction-side refrigerant line of the compressor of the cooling/heating unit,
• wherein the suction-side refrigerant over-heater further comprises:
• an exhaust gas heat exchanger arranged at an exhaust conduit to perform heat exchange with the exhaust gas, which passes through the exhaust conduit;
• a first suction-side over-heating heat exchanger to perform heat exchange between the suction-side refrigerant line of the compressor and a cooling water line to transfer the cooling water heat of the engine;
• and
• a second suction-side over-heating heat exchanger to perform heat exchange between the suction-side refrigerant line of the compressor and a line to transfer heat recovered by the exhaust gas heat exchanger.

A cogeneration system comprising:

• an engine, which drives a generator to generate electricity;
• a cooling/heating unit, which comprises a compressor, a four-way valve, an outdoor heat exchanger, an expansion device, and an indoor heat exchanger, to establish a heat pump type refrigerant cycle;
• and
• a discharge-side refrigerant over-heater during a heating mode of the cooling/heating unit to supply heat of exhaust gas discharged from the engine to a discharge-side refrigerant line of the compressor before a refrigerant in the discharge-side refrigerant line enters the indoor heat exchanger.

A cogeneration system comprising:

• an engine, which drives a generator to generate electricity:
• a cooling/heating unit, which comprises a compressor, a four-way valve, an outdoor heat exchanger an expansion device, and an indoor heat exchanger, to establish a heat pump type refrigerant cycle;
• and
• a discharge-side refrigerant over-heater to supply heat of exhaust gas discharged from the engine to a discharge-side refrigerant line of the compressor,
• wherein the discharge-side refrigerant over-heater comprises:
• an exhaust gas heat exchanger arranged at an exhaust conduit to perform heat exchange with the exhaust gas, which passes through the exhaust conduit;
• and
• a discharge-side over-heating heat exchanger to perform heat exchange between a line to receive heat recovered by the exhaust gas heat exchanger and the discharge-side refrigerant line of the compressor,
• wherein the cogeneration system further comprises:
• a bypass line branched from the discharge-side refrigerant line of the compressor;
• and
• a valve arranged in the discharge-side refrigerant line to change a refrigerant path between the discharge-side refrigerant line and the bypass line,
• whereby the refrigerant bypass line and the valve function to cause a refrigerant in the discharge-side refrigerant line to flow without passing through the discharge-side over-heating heat exchanger.