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The convective heat exchange at an exterior building surface, due to air flow along the surface, is usually modelled by convective heat transfer coefficients (CHTCs) which relate the convective heat flux normal to the wall q c,w (W/m²) to the difference between the surface temperature at the wall T w (°C) and a
heat transfer (the higher the velocity , higher the heat transfer rate) The rate of convection heat transfer is expressed by Newton?s law of cooling: Q = hA(T S-T a) Equation (1) Where, Q= rate of heat transfer in watts h= heat transfer coefficient in w/m2co T = Surface Temperature in co T a =ambient temperature in c o
Convection Heat Transfer Reading Problems 19-1 ? 19-8 19-15, 19-24, 19-35, 19-47, 19-53, 19-69, 19-77 20-1 ? 20-6 20-21, 20-28, 20-44, 20-57, 20-79 Introduction • in convective heat transfer, the bulk ?uid motion of the ?uid plays a major role in the over-all energy transfer process Therefore, knowledge of the velocity distribution
Methodology to solve problems involving convection heat transfer: A suggested methodology to solve problems requiring calculations of convective heat transfer coefficient using empirical correlations is as follows: 1 Identify flow geometry Is it a pipe, sphere, rectangular duct, plate? Is the fluid flowing inside or outside the pipe 2