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Assessment of pollutant dispersion from rooftop stacks: ASHRAE, ADMS and wim tunnel simulation

机译：评估屋顶烟囱中污染物的扩散：ASHRAE，ADMS和wim隧道模拟

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摘要

The prediction of downwind concentration of effluents from stack located on top of buildings is important Most current dispersion models assess the pollutant concentration at distances away from the building. It is important to study pollutant dispersion within the recirculation zone of the building, since studies have shown that effluents released from rooftop stacks have a tendency to re-enter the building through intakes located on the roof. These effects get more pronounced with the influence of RoofTop Structures (RTS). This paper presents a comparative study of the Atmospheric Dispersion Modelling System (ADMS), American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE 2003 and 2007 versions) and wind tunnel results. Four different cases involving a low-rise and high-rise building for stack heights (h_s) ranging from 1 m to 7 m, exhaust momentum ratios (M) ranging from 1 to 5 and wind direction (θ) of 0° and 45°, have been studied for neutral atmospheric stability conditions. In this regard the effect of RTS has also been examined by using wind tunnel, ADMS and ASHRAE models. ADMS yields higher dilutions near the stack at θ = 0° and cannot model the effect of RTS. Wind tunnel data compare well with ASHRAE 2003 at M = 5 for the low-rise building, but generally predict higher dilutions for the high-rise building. ASHRAE 2003 predicts lower dilutions than ADMS for the high-rise building, while ASHRAE 2007 yields very low dilutions for all cases, suggesting a need to reassess its suitability for practical design.
机译：对位于建筑物顶部的烟囱中废气的顺风浓度的预测很重要。大多数当前的扩散模型都在远离建筑物的位置评估污染物浓度。研究污染物在建筑物的再循环区内的扩散非常重要，因为研究表明，从屋顶烟囱释放的废水有通过屋顶上的进风口重新进入建筑物的趋势。这些效果在屋顶结构（RTS）的影响下更加明显。本文对大气扩散模型系统（ADMS），美国供热，制冷和空调工程师协会（ASHRAE 2003和2007版）和风洞结果进行了比较研究。四种不同的情况，包括低层和高层建筑，烟囱高度（h_s）为1 m至7 m，排气动量比（M）为1至5，风向（θ）为0°和45°已针对中性大气稳定性条件进行了研究。在这方面，还通过使用风洞，ADMS和ASHRAE模型检查了RTS的效果。 ADMS在θ= 0°时在烟囱附近产生更高的稀释度，无法模拟RTS的影响。对于低层建筑，风洞数据与ASHRAE 2003在M = 5时具有很好的对比，但通常可以预测高层建筑的稀释度更高。 ASHRAE 2003预测高层建筑的稀释度要比ADMS低，而ASHRAE 2007对所有情况的稀释度都非常低，这表明需要重新评估其在实际设计中的适用性。

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  • 来源
    《Building and Environment》 |2010年第12期|p.2768-2777|共10页
  • 作者

    B. Hajra; T. Stathopoulos; A. Bahloul;

  • 作者单位

    Department of Building. Civil and Environmental Engineering. Concordia University. Montreal. H3G 1M8 Canada;

    rnDepartment of Building. Civil and Environmental Engineering. Concordia University. Montreal. H3G 1M8 Canada;

    Institut de recherche Robert-Sauve en sante et en securite du travail, Montreal. Canada;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    building; dilution; dispersion; rooftop stack; wind tunnel;

    机译：建造;稀释;分散;屋顶栈风洞;

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