Study on proper design method of locating windows aiming at utilization of cross-ventilation in densely populated urban area

Toshihiro Nonaka, Takashi Kurabuchi, Masaaki Ohba, Tomoyuki Endo, Tomonobu Goto, Yuiko Kadowaki, Tomofumi Kawase

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
Subtitle of host publicationSustainable Built Environment
Pages131-137
Number of pages7
Publication statusPublished - 1 Dec 2007
Event6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007 - Sendai, Japan
Duration: 28 Oct 200731 Oct 2007

Publication series

NameIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment
Volume1

Conference

Conference6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
CountryJapan
CitySendai
Period28/10/0731/10/07

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Keywords

  • Building coverage ratio
  • Cross-ventilation
  • Local dynamic similarity model
  • Roof windows
  • Wind tunnel experiments

Cite this

Nonaka, T., Kurabuchi, T., Ohba, M., Endo, T., Goto, T., Kadowaki, Y., & Kawase, T. (2007). Study on proper design method of locating windows aiming at utilization of cross-ventilation in densely populated urban area. In IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment (pp. 131-137). (IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment; Vol. 1).