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Heat exchanger: device for transferring heat from a hot fluid to a cold fluid.
Examples: car radiator, air conditioning coils, a gas powered furnace, or various devices in an oil refinery and power plants.
Amount of heat transferred in a unit area of a heat exchanger is proportional to (temperature difference between the two fluids)*(heat conductance of the separating material). The total heat transferred is proportional to Area*(heat conductance of the separating material)*(average temperature difference between the two fluids).