Experimental study on discharge coefficient of outflow opening for predicting cross-ventilation flow rate

Tomonobu Goto, Masaaki Ohba, Takashi Kurabuchi, Tomoyuki Endo, Yoshihiko Akamine, Toshihiro Nonaka

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

Abstract

Variation of discharge coefficients with wind direction and opening position is one of the main factors debasing accuracy of cross-ventilation flow rate prediction. The local dynamic similarity model was developed to solve this problem, and previous studies had validated it for inflow openings. In the present study, two experiments were carried out to investigate its validity for outflow openings. The experiments showed that the relationships between the discharge coefficient and a dimensionless room pressure P R*, which was originally defined by the model, were independent of wind direction and opening position, although they were dependent on whether or not the outflow opening was in a recirculation flow region. It was thus concluded that the local dynamic similarity model was valid for outflow openings as well as inflow openings.

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
Pages341-348
Number of pages8
Publication statusPublished - 2007 Dec 1
Externally publishedYes
Event6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007 - Sendai, Japan
Duration: 2007 Oct 282007 Oct 31

Publication series

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

Other

Other6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
CountryJapan
CitySendai
Period07/10/2807/10/31

Keywords

  • Cross-ventilation
  • Discharge coefficient
  • Outflow opening
  • Wind tunnel experiment

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

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