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Heat exchangers are devices used to transfer heat between two or more fluids at different temperatures without mixing them. They are widely used in industries such as power plants, refrigeration, air conditioning, and chemical processing. Heat exchangers can be classified in several ways based on different criteria such as the nature of heat exchange, flow arrangement, construction, and phase of fluids. Based on the nature of heat exchange process, heat exchangers are classified into direct contact and indirect contact types. In direct contact heat exchangers, the fluids mix physically and exchange heat, such as in cooling towers. In indirect contact heat exchangers, the fluids are separated by a solid wall and heat is transferred through it. Based on flow ______ _______ __________ _______ _______ _______ ________ ____.
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