EXPERIMENTAL STUDY ON DISCHARGE COEFFICIENT OF OUTFLOW OPENING FOR PREDICTING CROSS-VENTILATION FLOW RATE

Variation of discharge coefficients with wind direction and opening position is one of the main factorsdebasing accuracy of cross-ventilation flow rate prediction. The local dynamic similarity model wasdeveloped to solve this problem, and previous studies had validated it for inflow openings. In thepresent study, two experiments were carried out to investigate its validity for outflow openings. Theexperiments showed that the relationships between the discharge coefficient and a dimensionlessroom pressure PR*, which was originally defined by the model, were independent of wind direction andopening position, although they were dependent on whether or not the outflow opening was in arecirculation flow region. It was thus concluded that the local dynamic similarity model was valid foroutflow openings as well as inflow openings.