Heat exchanger is used to exchange the heat from one fluid to another. In heat exchangers the temperature of each fluid changes as it passes through the exchanger, and hence the temperature of the dividing wall between the fluids also changes along the length of exchanger. Heat exchangers have many applications in engineering such as air intercoolers and evaporators, condensers and boilers in steam power plant, condensers and evaporators in refrigeration units, etc. In this text, we will discuss about parallel flow heat exchanger, counter flow heat exchange, and cross flow heat exchanger.
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