Heat exchangers take heat from one fluid and pass it to a second. The fire-tube array of a steam engine is a heat exchanger, taking heat from the hot combustion gases of the firebox and transmitting it to the water in the boiler. The network of finned tubes in an air conditioner is a heat exchanger, taking heat from the air of the room and dumping it into the working fluid of the conditioner. The radiator in a car performs a similar function. A key element in all heat exchangers is the tube wall or membrane which separates the two fluids. It is required to transmit heat and there is frequently a large pressure difference across it.
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