A preliminary comparison of calculated building ventilation rates using six different pressure coefficient data sets.

As part of the Air Infiltration & Ventilation Centre's Numerical Database development programme, Wind Pressure Coefficient data are being collected from many published sources, much of which will contribute to the Centre's own Pressure Coefficient database. To ensure the compatibility and validity of the various data sets, a preliminary comparison has been carried out of the data in use. The work has concentrated on an analysis of the effects of Cp values, for vertical walls, on calculated wind driven infiltration and ventilation rates. The intention is to demonstrate the reproducibility of results for similar data sets,and to produce some guidelines for their use.