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Numerical evaluation of louver configuration and ventilation strategies for the windcatcher system

机译：捕风系统百叶窗配置和通风策略的数值评估

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摘要

The windcatcher system is a green architectural feature that uses natural ventilation to induce external airflow into residential buildings. This paper presents different configuration and ventilation strategies for the windcatcher to evaluate the performance of the system in relation to ventilation and indoor particle dispersion. A commercial computational fluid dynamic (CFD) code is used to evaluate the windcatcher's performance using different numbers of louvers and louver lengths. The effects of buoyancy and window positions on the system's performance are considered. The flow rate of air induced into the windcatcher is found to increase with the number of louver layers and the highest ventilation rate is reached when the louver length equates with the reference length. With respect to the buoyancy effect, the results show that the system performs well in stimulating airflow and removing contaminants when a window is positioned on the leeward side. A uniform and low particle concentration is created when a window is positioned on the leeward side. However, due to the high air velocity below the windcatcher, the general airflow distribution of the system is not uniform. A damper or egg crated grill should be installed at the terminal of the system, especially when the external wind is strong.
机译：捕风器系统是一种绿色建筑特征，利用自然通风吸引外部气流进入住宅建筑。本文介绍了用于捕风器的不同配置和通风策略，以评估该系统在通风和室内颗粒扩散方面的性能。商业计算流体动力学（CFD）代码用于使用不同数量的百叶窗和百叶窗长度来评估捕风器的性能。考虑浮力和窗口位置对系统性能的影响。发现引入风挡的空气流量随着百叶窗层数的增加而增加，并且当百叶窗长度等于参考长度时达到最高通风率。关于浮力效果，结果表明，当窗户位于背风侧时，该系统在刺激气流和去除污染物方面表现良好。当窗户位于背风侧时，会产生均匀且低的颗粒浓度。但是，由于挡风装置下方的空气流速较高，因此系统的总体气流分布不均匀。应在系统的终端安装阻尼器或带鸡蛋的格栅，特别是在外部风较强的情况下。

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  • 来源
    《Building and Environment》 |2011年第8期|p.1600-1616|共17页
  • 作者

    Shichao Liu; CM. Mak; JianLei Niu;

  • 作者单位

    Department of Building Service Engineering, The Hong Kong Polytechnic University. Hung Horn, Kowloon, Hong Kong, China;

    Department of Building Service Engineering, The Hong Kong Polytechnic University. Hung Horn, Kowloon, Hong Kong, China;

    Department of Building Service Engineering, The Hong Kong Polytechnic University. Hung Horn, Kowloon, Hong Kong, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    windcatcher; louvers; particle dispersion; CFD; window;

    机译：捕风器;百叶窗;颗粒分散;CFD;窗口;

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