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Impact of green and white roofs on air handler filters and indoor ventilation air

机译：绿色和白色屋顶对空气处理器过滤器和室内通风空气的影响

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Rooftop surfaces near building outdoor air intakes may contribute to the mass loading on filters and compounds emitted to ventilation air downstream of the filter. In laboratory analyses, we characterized microbial composition, primary volatile organic compound (VOC) emissions, ozone removal rates, and VOC emissions in the presence of ozone on filters collected from air handlers located on the green and white roof sections of a big-box retail store. Total DNA masses per area of filter were 26.3 +/- 11.9 ng cm(-2) and 6.3 +/- 6.5 ng cm(-2) for green and white roof filters respectively, with higher mass observed in winter compared to the fall season. Of eight VOCs quantified at constant 23 degrees C and 50% RH across both seasons, fluxes of m/z 33.02 (putatively attributed to methanol) dominated VOC emissions for green, 10.96 +/- 3.09 mu mol m(-2) hr(-1), white, 12.02 +/- 3.41 mu mol m(-2) hr(-1), and unused filters, 5.64 +/- 1.08 mu mol m(-2) hr(-1). Ozone removal across all filters varied from 3.5% +/- 2.8%-14% +/- 2.8%, depending on temperature and RH condition. Fluxes of eight quantified VOCs were lower in the presence of ozone, apart from m/z 69.07 (putatively attributed to isoprene), where the presence of similar to 180 ppb inlet ozone resulted in increased fluxes by a factor of similar to 2.4. A steady-state mass balance predicted increases in ventilation air methanol levels by green roof filters ranging 0.10 mu g m(-3) to 19.44 mu g m(-3), depending on filter face velocity and filter geometry.
机译：建筑室外空气摄入附近的屋顶表面可能有助于在过滤器和过滤器下游通风空气的过滤器和化合物上的大量装载。在实验室分析中，我们在从位于大盒子零售的绿色和白色屋顶部分的空气搬运机构收集的过滤器存在下，我们表征了微生物组合物，初级挥发性有机化合物（VOC）排放，臭氧去除率和VOC排放店铺。每种过滤器的总DNA质量为26.3 +/- 11.9 ng cm（-2）和6.3 +/- 6.5 ng cm（-2）用于绿色和白色屋顶滤波器，与秋季相比，冬季观察到较高的质量。在恒定的23摄氏度和50％RH下量化八个VOC，在两个季节，m / z 33.02的助熔剂（甲醇归因于甲醇）为绿色的VOC排放占主导地位，10.96 +/- 3.09 mm mol m（-2）hr（ - 1），白色，12.02 +/- 3.41 mm mol m（-2）Hr（-1），未使用过滤器，5.64 +/- 1.08 mm mol m（-2）hr（-1）。臭氧除去所有滤波器的臭氧可根据温度和RH条件的3.5％+/- 2.8％-14％+/- 2.8％而变化。除了M / Z 69.07（令人置信于异戊二烯）的情况下，八种量化VOC的助量较低，其中类似于180ppb入口臭氧的存在，导致增加的通量与2.4相似的倍率增加。通过绿色屋顶滤网（-3）至19.44μg）至19.44μg），稳态质量平衡预测通风空气甲醇水平的增加，这取决于过滤器面速度和滤波几何形状。

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