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Numerical simulations of the effect of outdoor pollutants on indoor air quality of buildings next to a street canyon

机译：室外污染物对街道峡谷旁建筑物室内空气质量影响的数值模拟

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摘要

To explore the effect of traffic pollution on indoor air quality of naturally ventilated buildings in the vicinity of a street canyon, the wind flow and pollutant distributions in and around buildings with different window opening percentages (i.e. WOP, the percentage of the total window opening area to the total facade area) were investigated by three-dimensional numerical simulations. The numerical results show that the WOP changes the pressure distribution around the downstream building, which is due to the infiltration of air into the street canyon through the opening windows of both the upstream and downstream buildings. When the indoor air of the downstream building is supplied by the outdoor air from the street canyon, the ventilation flux will be increased with increasing WOP. If the indoor air is taken in from the leeward side of the downstream building, however, the trend of the ventilation flux is found reverse. The results also indicate that the effective source intensity, which is introduced to quantify the amount of traffic pollutant entering into buildings through unit ventilation area, decreases as the WOP increases. When the WOP reaches 10%, the averaged effective intensity is reduced by 30% compared to the reference case when all windows are closed. It means that if a naturally ventilated room in the downstream building has a fixed ventilated area over different seasons, the room will take in more pollutants from outdoors in winter than in other seasons.
机译：探讨交通污染对街道峡谷附近自然通风建筑的室内空气质量的影响，不同开窗百分比的建筑物内外的风流和污染物分布（即，WOP，即总开窗面积的百分比）到总的立面面积）进行了三维数值模拟研究。数值结果表明，WOP改变了下游建筑物周围的压力分布，这是由于空气通过上游和下游建筑物的开口窗渗入街道峡谷。当下游建筑物的室内空气由街道峡谷的室外空气提供时，通气量将随着WOP的增加而增加。但是，如果从下游建筑物的背风侧吸入室内空气，则通气量的趋势相反。结果还表明，引入有效源强度是为了量化通过单位通风区域进入建筑物的交通污染物的数量，随着WOP的增加而降低。当WOP达到10％时，与所有窗口均关闭时的参考情况相比，平均有效强度降低了30％。这意味着，如果下游建筑物中的自然通风房间在不同季节具有固定的通风区域，则该房间在冬季将比其他季节从室外吸收更多的污染物。

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