The effect of Wind Velocity and night natural ventilation on the inside air temperature in passive cooling ventilation in arid zones

Abstract

The effect of wind velocity and night natural ventilation in lowering the inside daytime air temperature in passive cooling in arid zones were investigated by numerical calculations and experimental means for different values of air change flow rate due to infiltrations and natural ventilation and different wind speed. The numerical calculations based on the inside outside air temperature, wind speed, cracks, and openings dimensions to determine the volume of air change per hour. The experimental model was a test cell with the door facing north and the window in the opposite side facing south, the volume of the model was 9 m3. The calculated and measured results show that 1.8 volume per hour of air change flow rate and 2 m/s wind speed show a high concordance between calculated and measured inside air temperature and can lower the inside air temperature by 3-4 °C compared to non-ventilated test cell [1].