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...Classication of heat exchangers a exchanger is device that used to transfer thermal energy enthalpy between two or more uids solid surface and uid particulates at di erent temperatures in contact there are usually no external work interactions few exchangeuirdss t he exchanging direct most betweenui ds takes place through separating wall into out transient manner many the separated by ideally they do not mix leak such referred as type simply recuperators contrast which intermittent exchange hot cold via storage release matrix indirect regenerators have leakage from one stream other due pressure dierences rotation valve switching general if immiscible may be eliminated interface replaces core with transferred conduction portion both transfers them primary increase area appendages intimately connected provide an extended secondary these elements nsas hus conducted n convicted radiated surrounding vice versa depe nding on whether being cooled heated can classied ways we will classify acco...