External convection coefficients for framed rectangular elements on building facades

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• 作者：Taki ; A.H. ; Loveday ; D.L.
• 关键词：Facade ; Heat transfer ; Framed rectangular elements ; High-rise buildings
• 刊名：Energy and Buildings
• 出版年：1996
• 出版时间：July, 1996
• 年：1996
• 卷：24
• 期：2
• 页码：147-154
• 全文大小：714 K

文摘

Using data obtained from a heated test plate fixed to the wall of an eight-storey building, correlations are presented for the external convection coefficient h_c, as a function of windspeeds measured at 1 m from the test plate surface and at 11 m above the roof (in the free stream). The effects of a rectangular frame on the value of h_c are measured for a range of frame depths, the geometries tested relating to facade configurations which are typical of glazing framework designs commonly found in UK commercial high-rise buildings and atria. For the stated conditions of use, the regression correlations may be used by designers and thermal modellers for the prediction of h_c values for a range of typical building facades comprised of mullion and transom-type protrusions. The findings are particularly relevant to improving the accuracy of heat loss calculations from glazing.