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Abstract

Accurate knowledge of the heat transfer processes that take place at the external surfaces of a building is necessary for thermal modelling and for design purposes. Using a heated test plate fixed at the sixth-floor level to the wall of an eight-storey building, correlations are presented for the external convection coefficient, h_c, as a function of wind speeds measured 1 metre from the test surface and 11 metres above the roof in the free stream. The effects of vertical mullion-type protrusions on the value of h_c are measured for a range of protrusion heights separated by a fixed spacing, the geometries tested relating to facade configurations which are commonly found in British commercial high-rise buildings. Regression correlations are derived which may be used by designers and thermal modellers for the prediction of h_c values for a range of typical building facades with vertical mullion-type protrusions.

Keywords

building facades surface protrusions wall and glazing convection coefficients window framework mullion

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Surface Convection Coefficients for Building Facades with Vertical Mullion-Type Protrusions

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