Give the principal of heat exchange.
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The essential principle of a heat exchanger is that it transfers the heat without transferring the fluid that carries the heat. ... Heat is exchanged by the fluids: the hot fluid cools down and the cold fluid warms up, without them actually coming into contact and mixing.
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A heat exchanger is a system used to transfer heat between two or more fluids. Heat exchangers are used in both cooling and heating processes. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact
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