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| summary=A heat exchanger is used to transfer energy to the potable water from the fluid being heated in the solar collector}}
A heat exchanger is a device built for efficient heat transfer from one medium to another. The media may be separated by a solid wall, so that they never mix, or they may be in direct contact. They are widely used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing, and sewage treatment. One common example of a heat exchanger is the radiator in a car, in which the heat source, being a hot engine-cooling fluid, water, transfers heat to air flowing through the radiator (i.e. the heat transfer medium).
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*[http://www.amazon.com/Heat-Exchangers-Selection-Rating-Thermal/dp/0849309026 Heat Exchangers: Selection, Rating and Thermal Design]
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