Concept

# Heat transfer coefficient

Summary
In thermodynamics, the heat transfer coefficient or film coefficient, or film effectiveness, is the proportionality constant between the heat flux and the thermodynamic driving force for the flow of heat (i.e., the temperature difference, ΔT ). It is used in calculating the heat transfer, typically by convection or phase transition between a fluid and a solid. The heat transfer coefficient has SI units in watts per square meter per kelvin (W/m2/K). The overall heat transfer rate for combined modes is usually expressed in terms of an overall conductance or heat transfer coefficient, U. In that case, the heat transfer rate is: :\dot{Q}=hA(T_2-T_1) where (in SI units): *A: surface area where the heat transfer takes place (m2) *T2: temperature of the surrounding fluid (K) *T1: temperature of the solid surface (K) The general definition of the heat transfer coefficient is: :h = \frac{q}{\Delta T} where: *
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