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The overall heat transfer coefficient is used to represent the combined effect of conduction and convection resistances in a heat transfer process. It is especially useful in analyzing heat exchangers and composite systems where heat passes through different layers and surfaces. To derive its expression, consider a flat wall separating two fluids at different temperatures. Let a hot fluid at temperature (T_1) be on one side of a wall and a cold _________ ____ ______ __________ _________ ________ _________ _______ ___ ______ ___ __________.
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