TY - GEN
T1 - Study on proper design method of locating windows aiming at utilization of cross-ventilation in densely populated urban area
AU - Nonaka, Toshihiro
AU - Kurabuchi, Takashi
AU - Ohba, Masaaki
AU - Endo, Tomoyuki
AU - Goto, Tomonobu
AU - Kadowaki, Yuiko
AU - Kawase, Tomofumi
PY - 2007/12/1
Y1 - 2007/12/1
N2 - This study is focused on the efficient use of cross-ventilation in a densely populated area by using roof windows in particular. Wind tunnel experiments were conducted to understand not only the relation between the building coverage ratio and the coefficient of wind pressure (C p) but also the relation between the roof slope of a residence and C p value. To simulate an urban area, dummy models were placed around a target model, and the building densities were set to 0, 10, 20, and 40%. The roof slopes of residences were set to 0° (flat roof), 15°, and 26.7°. The C p distribution on the surface of each residential model was measured. The tangential dynamic pressure at the openings was also measured to predict the cross-ventilation rate (Q value) by using a local dynamic similarity model, and the calculated Q value was compared with the experimental value. The experiments and calculations revealed the following information: (1) the overall C p value of a flat roof residence approaches zero when the building coverage ratio increases; (2) a negative pressure is maintained near the ridge of a leeward roof, even if the building coverage ratio increases to 40%; and (3) the efficient use of the negative pressure near the ridge on the leeward roof can improve the cross-ventilation rate in a densely populated area.
AB - This study is focused on the efficient use of cross-ventilation in a densely populated area by using roof windows in particular. Wind tunnel experiments were conducted to understand not only the relation between the building coverage ratio and the coefficient of wind pressure (C p) but also the relation between the roof slope of a residence and C p value. To simulate an urban area, dummy models were placed around a target model, and the building densities were set to 0, 10, 20, and 40%. The roof slopes of residences were set to 0° (flat roof), 15°, and 26.7°. The C p distribution on the surface of each residential model was measured. The tangential dynamic pressure at the openings was also measured to predict the cross-ventilation rate (Q value) by using a local dynamic similarity model, and the calculated Q value was compared with the experimental value. The experiments and calculations revealed the following information: (1) the overall C p value of a flat roof residence approaches zero when the building coverage ratio increases; (2) a negative pressure is maintained near the ridge of a leeward roof, even if the building coverage ratio increases to 40%; and (3) the efficient use of the negative pressure near the ridge on the leeward roof can improve the cross-ventilation rate in a densely populated area.
KW - Building coverage ratio
KW - Cross-ventilation
KW - Local dynamic similarity model
KW - Roof windows
KW - Wind tunnel experiments
UR - http://www.scopus.com/inward/record.url?scp=84857283524&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84857283524
SN - 9784861630705
T3 - IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment
SP - 131
EP - 137
BT - IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
T2 - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
Y2 - 28 October 2007 through 31 October 2007
ER -