This study is focused on the efficient use of cross-ventilation in a densely populated area by using roofwindows in particular. Wind tunnel experiments were conducted to understand not only the relationbetween the building coverage ratio and the coefficient of wind pressure (Cp) but also the relationbetween the roof slope of a residence and Cp value. To simulate an urban area, dummy models wereplaced around a target model, and the building densities were set to 0, 10, 20, and 40%. The roofslopes of residences were set to 0 (flat roof), 15, and 26.7.
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