SINGLE-SIDED NATURAL VENTILATION DRIVEN BY A COMBINATION OF WIND PRESSURE AND TEMPERATURE DIFFERENCE

Natural ventilation is a commonly used principle when ventilation systems for buildings are designed.The ventilation can either be obtained by automatically controlled openings in the building envelope, orit can just be the simple action of opening a door or a window to let the fresh air in. In both situations theaim is to obtain a good indoor environment but to control the amount of air, some basic knowledge ofthe flow through an opening is necessary.The amount of air going through the window opening in single-sided ventilation will depend on the windspeed near the building, the temperatures inside and outside the room, the wind direction, theturbulence characteristics in the wind and the pressure variations caused by e.g. wind gusts. Finally italso depends on the size, type and location of the opening. Therefore, expressions for this predictionmainly depend on unsteady parameters, which make the prediction difficult.From earlier work, a few design expressions for single-sided ventilation already exist, but none of theseinclude the wind direction, which here is an important parameter. Therefore several wind tunnelexperiments are made in this work to find a new design expression which includes all of the aboveparameters.