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Pollutant flushing with natural displacement ventilation

机译：自然置换通风冲洗污染物

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摘要

We examine the time taken to flush pollutants from a naturally ventilated room. A simple theoretical model is developed to predict the time taken for neutrally-buoyant pollutants to be removed from a room by a flow driven by localised heat inputs; both line and point heat sources are considered. We show that the rate of flushing is a function of the room volume, vent areas (A~*) and the distribution, number (n) and strength (B) of the heat sources. We also show that the entire problem can be reduced to a single parameter (μ) that is a measure of the vent areas, and a dimensionless time (τ) that is a function of B, V and μ. Small-scale salt-bath experiments were conducted to measure the flushing rates in order to validate our modelling assumptions and predictions. The predicted flushing times show good agreement with the experiments over a wide range of μ. We apply our model to a typical open plan office and lecture theatre and discuss some of the implications of our results.
机译：我们检查了从自然通风的房间冲洗污染物所花费的时间。建立了一个简单的理论模型来预测由局部热量输入驱动的流动将中性浮力污染物从房间中清除所花费的时间。同时考虑线和点热源。我们表明冲洗速度是房间容积，通风面积（A〜*）和热源的分布，数量（n）和强度（B）的函数。我们还表明，可以将整个问题简化为衡量通气孔面积的单个参数（μ），以及作为B，V和μ的函数的无因次时间（τ）。为了验证我们的模型假设和预测，进行了小型盐浴实验以测量冲洗速度。预测的冲洗时间在较大的μ范围内与实验显示出良好的一致性。我们将模型应用于典型的开放式办公室和演讲厅，并讨论结果的某些含义。

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