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http://www.articlesolve.com - Heat Exchanger is the equipment in which heat (thermal energy) istransferred from one fluid to another fluid. These fluids are separated from each other with a metallic wall. To affect the exchange of heat, both the fluids must be at different temperatures. Heat will flow from hotter to the colder fluid. - See more at: http://www.articlesolve.com/articledetail.php?artid=491511&catid=86