Effects of wind conditions on heat dissipation from surfaces of walls for isolated low-rise building subject to winter solar radiation

Using a numerical simulation method which takes solar radiation into account, the process of heat transfer in a building envelope has been studied. The effects of wind direction and wind speed on the heat dissipation at the outside surfaces of an isolated low-rise building have been analyzed. The results show that the wind speed has a greater effect on the thermal energy dissipation flux at the outer surfaces of the building than the wind direction. The cumulative heat dissipation is at a maximum when the wall is perpendicular to the wind direction. Using binomial fitting equations relating the time-cumulative heat dissipation (which includes the convective and radiative heat exchanges), the heat dissipation coefficient for the outer wall surfaces, wind speed, and wind direction have been determined. These equations can be used as a theoretical basis to determine the air-conditioning load.