Fundamental Study on Formula for Predicting Convective Heat Transfer Coefficient above Heated Panels Using Thermally Stratified Wind Tunnel

Abstract eng:
Complex heat transfer fluxes occur between external surfaces of building walls and the urban canopy layer on typical summer days. Convective heat transfer coefficients on urban surfaces are essential indexes that roughly indicate the characteristics of sensible heat fluxes inside the canopy layer. Thus, an experiment was conducted to obtain a formula for predicting these coefficients. The radiative heat transfer was calculated by Gebhart's absorption factor method. The heat transfer coefficients over a rough floor in the velocity range from 0.5m/s to 2.0m/s were larger than those over a smooth floor. An experimental formula for the heat transfer coefficients as a function of reference velocity and bulk Richardson number was derived by a nonlinear regression model. Experiments must be carried out to accumulate data and to obtain high quality prediction formulas. Key words: convective heat transfer coefficient, bulk Richardson number, thermally stratified wind tunnel

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