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Wind-driven natural ventilation for buildings with two openings on the same external wall

机译：风驱动的自然通风，用于在同一外墙上有两个开口的建筑物

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This study uses wind tunnel experiments to investigate the wind-driven ventilation for buildings with two openings on a single wall. The exchange rates are measured by the tracer gas decay method under different external wind speeds, directions and opening sizes. The experimental results indicate that the time-averaged pressure difference across the openings is much larger than the fluctuating pressure when the wind direction is theta=22.5-45 degrees, and the ventilation rate can be predicted by the orifice equation. When the wind direction is theta=0 degrees and 67.5-180 degrees, the pressure difference across the openings is insignificant and the fluctuating pressure entrains air across the openings. The exchange rate is proportional to the root-mean-square of the pressure fluctuation. Furthermore, the dimensionless exchange rate of the shear-induced ventilation (wind is parallel to the openings) is found to be independent of the wind speed, opening area and location. The exchange rate for buildings with an internal partition is lower than that without a partition when the wind direction is theta = 0-90 degrees. A semi-empirical prediction model is proposed to calculate the exchange rate by incorporating the time-averaged pressure difference and pressure fluctuation. The application of the prediction model to compute the air change rate (ACH) is also discussed. (C) 2015 Elsevier B.V. All rights reserved.
机译：这项研究使用风洞实验研究了单壁上有两个开口的建筑物的风驱动通风。交换率通过示踪气体衰减法在不同的外部风速，方向和开口尺寸下测量。实验结果表明，风向为θ= 22.5-45度时，各孔口的时间平均压力差远大于脉动压力，可通过孔板方程预测通风量。当风向为θ= 0度和67.5-180度时，跨孔的压力差很小，并且波动的压力使空气夹带通过孔。交换速率与压力波动的均方根成正比。此外，发现剪切引起的通风的无量纲交换率（风平行于开口）与风速，开口面积和位置无关。当风向为theta = 0-90度时，具有内部分隔的建筑物的汇率要低于没有内部分隔的建筑物的汇率。提出了一种半经验预测模型，通过结合时间平均压力差和压力波动来计算交换率。还讨论了预测模型在计算空气变化率（ACH）中的应用。 （C）2015 Elsevier B.V.保留所有权利。

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