ABSTRACT
The effects of wind velocity and wind incidence angle on the convective heat transfer coefficient were conducted through the model test with the wind tunnel. The wind velocity and the convective heat transfer coefficirnt for the prototype were estimated using the law of similarity based on turbulent Reynolds number and turbulence intensity. The coefficients that were used for calculations of the convection heat transfer coefficients of prototype were interpolated with the values of the parallel air flow pattern and the vertical air flow pattern.HomePage
In this study the comparison between the model convective heat transfer and prototype convective heat transfer coefficient were demonstrated. The correlation study showed a highly significant correlation between model value and prototype value. The apprpximate convective heat transfer coefficient of prototype can be calculated by using the interpolated scale up coefficient.
The relationship between the convective heat transfer coefficient and wind velocity were shown with the regression curve. The gradient of regression curve for the roof showed the highest value. The gradient of regression curve for the gable showed the smallest value. So, the wind velocity significantly affects the convection heat transfer coefficients of the roof.
The effect of wind incidence angle showed different trend at the windward wall and leeward wall. The different trends were found in relationship between the convective heat transfer coefficient and the wind incidence angle at each wall. The wind incidence angle significantly affects the heat transfer coefficients of the leeward gable and the leeward skirt. It affects about 10% to 20% of the convective heat transfer coefficients in the other walls.
From these results, the functional formula that is based on the wind velocity doesn't give the exact convective heat transfer coefficient when the wind velocity is fast. However the functional formula based on the wind velocity and the wind direction can be applied for the determination of the convective heat transfer coefficient.Keywords: model test, law of similarity, heat transfer