A heat exchanger is a device in which energy is transferred from one fluid to another across a solid surface, a widely used engineering processes. Exchanger analysis and design therefore involve both convection and conduction. Radiative transfer between the exchanger and the environment can usually be neglected unless the exchanger is uninsulated and its external surfaces are very hot.

Some examples are intercoolers, preheaters, boilers and condensers in power plants.

Texas Systems & Controls resolves two important problems in heat exchanger analysis which require rating a heat exchanger(s) and sizing the heat exchangers for a particular application. Rating involves the determination of the rate of heat transfer, the change in temperature of the two fluids, and the pressure drop across the heat exchanger. Sizing involves selection of a specific heat exchanger from those currently available or determining the dimensions for the design of a new heat exchanger, given the required rate of heat transfer and allowable pressure drop.

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