學術研究

WIND-DRIVEN VENTILATION FOR TWO OPENINGS ON A SINGLE WALL

Chia-Ren Chu、Ti-Ting Tsai

本文關鍵字：NATURAL VENTILATION; WIND-DRIVEN VENTILATION; SINGLE-SIDED VENTILATION; WIND TUNNEL EXPERIMENT; TRACER GAS TECHNIQUE.

本文摘要This study used wind tunnel experiments to investigate the influence of wind speed, direction and opening size on the wind-driven ventilation with two openings on a single wall. The exchange rates Q across the openings were measured by a tracer gas decay method. The experimental results reveal that the exchange rate can be predicted by the orifice equation when wind direction  = 22.5o ~ 45o and the time-averaged pressure difference across the opening is much larger than the fluctuating pressure. When wind direction 0o and 67.5o~180o, the pressure difference across the openings is insignificant and the fluctuating pressure will entrain air across the opening, and the exchange rate is proportional to the root-mean-square of pressure fluctuation. Furthermore, the dimensionless exchange rate, Q* = Q/UHA, of shear-induced ventilation (wind is parallel to the openings) is independent of the wind speed UH, opening area A and location. A prediction model is proposed to incorporate the influences of the time-averaged pressure difference and pressure fluctuation on the exchange rate of buildings with two openings on the same wall.
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  • APA 格式：
    Chia-Ren Chu、Ti-Ting Tsai（2016 年 1 月 22 日），〈WIND-DRIVEN VENTILATION FOR TWO OPENINGS ON A SINGLE WALL〉。《中華民國風工程學會電子報》，2024 年 5 月 16 日取自：http://www.wind.org.tw/epaper/index.php?id=58
  • MLA 格式：
    Chia-Ren Chu、Ti-Ting Tsai，〈WIND-DRIVEN VENTILATION FOR TWO OPENINGS ON A SINGLE WALL〉。《中華民國風工程學會電子報》第 9 期（2016），取自：http://www.wind.org.tw/epaper/index.php?id=58
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