Interference Coefficient for Discharge Coefficient in Prediction of CrossVentilation Rate through Large Openings

In predicting the cross ventilation rate throughlarge openings, the use of general dischargedcoefficient , values for the conventionalorifice equation is not suitable. 'Interferencecoefficient' which is the ratio of the totalpressure loss coefficient of the room (0 to theconnected value of the pressure loss coefficientof an opening in series (Cn was used. This is akind of correction factor. The laboratory testswere conducted to measure this interferencecoefficient for the various opening sizes androom shapes using scaled models. Wind tunnelexperiments to know the cross ventilation rateof the model were also conducted. Calculatedventilation rates using the interferencecoefficient were compared with measured ones.