This study was carried out systematically as follows; at first, an investigation of gross-building-to-land ratio of real residential area with GIS data was carried out. We obtained the result that almost areas locate within the range from 20 to 45%, and the average was 33%. From these results, reproduction-conditions of building-models in the wind tunnel experiment were decided. Secondly, in these reproduction-conditions, wind pressure coefficients of residential buildings were measured. Plan-shapes of target buildings were two kinds. One was rectangular plan with flat roof, gable roof and hipped roof. And the other was L-character-plan with flat roof and gable roof. Analysis of wind pressure coefficients distributions were made according to the density of the urban area and the arrangement of buildings in surrounding. Finally, based on these experimental results, air-flow—network-simulation was carried out, and simplified prediction method of air change rate by cross-ventilation was examined. As a result, simple equation of which variable were opening-Area and external wind velocity for rough prediction of air change rate by cross-ventilation was obtained.
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