Submitted by Maria.Kapsalaki on Wed, 02/05/2020 - 16:44
Ventilative cooling can be used as a passive cooling measure to reduce the cooling energy demand of buildings. It can be used during the day, directly removing excessive heat gains, or during the night (i.e. night flush), in which cold outdoor air flows through the building and cools down the indoor air volume and subsequently the thermal mass of the building. Night flushing reduces the indoor air temperatures at the beginning of the next day and the cooling demand over the day.
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.