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A heat exchanger is a device used to transfer heat between two or more fluids.Another example is the heat sink, which is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant.They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural gas processing, and sewage treatment.A solid wall to prevent mixing may separate the fluids or they may be in direct contact.

A heat exchanger is a device used to transfer heat between two or more fluids. A solid wall to prevent mixing may separate the fluids or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries, natural gas processing, and sewage treatment. The classic example of a heat exchanger is found in an internal combustion engine in which a circulating fluid known as engine coolant flows through radiator coils and air flows past the coils, which cools the coolant and heats the incoming air. Another example is the heat sink, which is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant.

Air-Water Heat Exchanger is used to apply the heat transfer principles between two fluids (Air & Water).Air is used to cool hot water (heated by boiler) flowing through the cooling tunnel , it's one of the most effective heat exchanger with large surface area (Radiator) which allow maximum exchange between two fluids ,but one of