Abstract: An exhaust gas heat exchanger for a cogeneration system is disclosed which includes exhaust gas discharge tubes each including a bellows tube portion formed at at least a portion of the exhaust gas discharge tube to enable the exhaust gas discharge tube to be thermally expanded and shrunken, so that it is possible to prevent the exhaust gas discharge tube from being damaged due to repeated thermal expansion and shrinkage thereof caused by hot exhaust gas passing through the exhaust gas discharge tube. Accordingly, an enhancement in durability and reliability is achieved.

Abstract: An exhaust gas heat exchanger for a cogeneration system is disclosed. In the exhaust gas heat exchanger, a heat exchanger cover is arranged around a heat exchanger body such that a primary heat medium passage, through which a heat medium passes, is defined between the heat exchanger cover and the heat exchanger body. In the heat exchanger body, a heat medium tube forming a secondary heat medium passage, through which the heat medium emerging from the primary heat medium passage passes, is arranged. Accordingly, the heat medium primarily absorbs heat from the exhaust gas while passing through the primary heat medium passage, and then secondarily absorbs heat from the exhaust gas while passing through the secondary heat medium passage. As a result, an enhancement in heat exchanging efficiency is achieved.

Abstract: A cogeneration system including a heat pump type air conditioner including an outdoor heat exchanger and an outdoor heat exchanger bypass conduit, and a cogeneration unit including a second outdoor heat exchanger, an outdoor heat exchanger bypass conduit, second outdoor heat exchanger connecting conduits, and second outdoor heat exchanger bypass conduit to cause the refrigerant to be evaporated in the second outdoor heat exchanger during a heating operation of the heat pump type air conditioner, and to cause the refrigerant to be condensed in the outdoor heat exchanger during a cooling operation of the heat pump type air conditioner, so that the heat pump type air conditioner can provide a constant heating capacity irrespective of a variation in outdoor temperature during the heating operation thereof.

Abstract: A method for controlling a cogeneration system is disclosed. The control method determines whether or not the operation load or power load of an air conditioner corresponds to a load requiring driving of a generator, controls the generator to operate when it is determined that the operation load of the air conditioner corresponds to the generator driving load, controls the air conditioner to operate using electric power generated from the generator when the generator operates normally, and controls the air conditioner to operate using commercial electric power when the operation load of the air conditioner is not the generator driving load or when the generator operates abnormally. Accordingly, there are advantages in terms of economy and safety.

Abstract: A cogeneration system is disclosed. The cogeneration system includes a heat pump type air conditioner, a waste heat recoverer to recover waste heat of a drive source, a waste heat supplying heat exchanger, which is heated by the waste heat recovered by the waste heat recoverer, and a bypassing unit, which causes the waste heat supplying heat exchanger to function as an evaporator during a heating operation of the heat pump type air conditioner. In accordance with this arrangement, it is possible to enhance the heating capacity of the heat pump type air conditioner irrespective of outdoor temperature, to prevent damage of compressors, and to minimize power consumption.

Abstract: A cogeneration system is disclosed which includes a waste heat recovering heat exchanger for recovering waste heat generated from a drive source when the drive source operates to drive a generator, heating heat exchangers for heating indoor air, and a heat transfer unit for transferring heat from the waste heat recovering heat exchanger to the heating heat exchangers. The waste heat of the drive source can be used to heat indoor air present in an indoor space. Accordingly, it is possible to maximize the efficiency of the cogeneration system, and to heat indoor heat without driving a compressor.

Abstract: A cogeneration system including a pre-heater to pre-heat outdoor air blown toward the outdoor heat exchanger during a heating operation of a heat pump type air conditioner, an auxiliary evaporator to evaporate a refrigerant emerging from the outdoor heat exchanger during the heating operation of the heat pump type air conditioner, and waste heat recovering means to transfer waste heat of the engine to at least one of the pre-heater and the auxiliary evaporator. The cogeneration system exhibits a high energy efficiency.

Abstract: A cogeneration system in which at least one of the heat of an engine-cooling heat exchanger and the heat of an exhaust gas heat exchanger is used in a heat consumer during a heating operation of the heat consumer, and the heat of the engine-cooling heat exchanger is transferred to a radiator to allow the transferred heat to be discharged from the radiator during a cooling operation of the heat consumer, so that it is possible to minimize the size of the radiator and the amount of air blown to the radiator, and to reduce costs and noise.

Abstract: An exhaust gas heat exchanger assembly of a cogeneration system including exhaust tubes, through which exhaust gas discharged from an engine passes, a muffler arranged between the exhaust tubes to reduce exhaust noise, and a first exhaust gas heat exchanger and a second exhaust gas heat exchanger respectively arranged at opposite sides of the muffler to perform heat exchange with the exhaust gas passing through the exhaust tubes. In accordance with the exhaust gas heat exchanger assembly, it is possible to reduce exhaust noise, and thus, to achieve a more quiet system operation. In addition, the heat exchangers are arranged in a compact state, so that it is possible to reduce the volume of the cogeneration system and to enhance the utility of the cogeneration system.

Abstract: A cogeneration system including an engine, which drives a generator to generate electricity, a cooling/heating unit, which comprises at least one 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 pre-heat supplier to supply heat of cooling water used to cool the engine and heat of exhaust gas discharged from the engine to the outdoor heat exchanger, and thus, to pre-heat air passing around the outdoor heat exchanger, and a refrigerant over-heater to supply the heat of the exhaust gas discharged from the engine to an inlet of the indoor heat exchanger of the cooling/heating unit. In accordance with the cogeneration system, it is possible to maximize engine waste heat utilization, and thus, to achieve an enhancement in heating performance.

Abstract: Disclosed is a heat exchanger including: a plurality of tubes through which refrigerants flow, the tubes being spaced away from one another; and a fin through which the tubes are perpendicularly inserted, and having a fin collar for supporting the inserted tube, a seat for supporting an outer circumference of a lower end of the fin collar, and three or more peak portions and three or more valley portions that are alternately disposed at an area defined between the tubes to cause air flow to vary at an area defined between the fin collar, heights of at least two peak portions or depths of at least two valley portions being different from each other.

Abstract: Disclosed is a heat exchanger including a plurality of tubes through which refrigerants flow, the tubes being spaced away from each other, and a plurality of fins spaced away from each other at a predetermined distance. Each of the fins has fin collars through which the tubes are perpendicularly inserted, seat portions each concentrically formed around outer circumferences of the fin collars and provided with laterally-opened front and rear portions, more than two peak portions, and more than two valley portions, the peak and valley portions being alternately disposed to provide airflow variation.