Effects of room furnishings and air speed on particle deposition rates indoors
Effects of room furnishings and air speed on particle deposition rates indoors
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DOI：
10.1016/s1352-2310(02)00157-7
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发表时间：
2002-04-01
影响因子：
5
通讯作者：
Nazaroff, WW
中科院分区：
文献类型：
--
作者：
Thatcher, TL;Lai, ACK;Nazaroff, WW
表面颗粒沉积对于确定室内颗粒暴露程度起着重要作用。然而，家具和空气速度对这些速率的影响尚未得到很好的表征。在本研究中，实验在一个隔离房间（体积 = 14.2 m(3)）中进行，使用三种不同的室内陈设水平（裸露、铺有地毯和家具齐全）和四种不同的气流条件。通过产生短爆发的多分散颗粒，然后使用空气动力学粒度测定仪测量尺寸分辨（0.5-10μm）浓度衰减率来确定沉积损失率。将表面积从裸露（35 m(2) 标称表面积）增加到配备齐全（12 m(2) 附加表面积）时，沉积损失率增加了 2.6 倍，其中最小颗粒的增幅最大。通过增加风扇速度，将平均空速从 < 5 厘米/秒增加到 19 厘米/秒，增加了按 1.3 至 2.4 范围内的因子研究的所有颗粒尺寸的沉积速率，其中较大颗粒比较小颗粒表现出更大的效果。颗粒尺寸和房间条件对沉积损失率的显着影响反对使用单个一阶损失率系数来表示集成质量测量（PM2.5 或 PM10）的沉积。 (C) 2002 年，爱思唯尔科学有限公司出版。
Particle deposition to surfaces plays an important role in determining exposures to indoor particles. However, the effects of furnishings and air speed on these rates have not been well characterized. In this study, experiments were performed in an isolated room (volume = 14.2 m(3)) using three different indoor furnishing levels (bare, carpeted, and fully furnished) and four different air flow conditions. Deposition loss rates were determined by generating a short burst of polydispersed particles, then measuring the size-resolved (0.5-10 mum) concentration decay rate using an aerodynamic particle sizer. Increasing the surface area from bare (35 m(2) nominal surface area) to fully furnished (12 m(2) additional surface area) increased the deposition loss rate by as much as a factor of 2.6 with the largest increase seen for the smallest particles. Increasing the mean airspeed from < 5 to 19 cm/s, by means of increasing fan speed, increased the deposition rate for all particle sizes studied by factors ranging from 1.3 to 2.4 with larger particles exhibiting greater effects than smaller particles. The significant effect of particle size and room conditions on deposition loss rates argues against using a single first-order loss-rate coefficient to represent deposition for integrated mass measurements (PM2.5 or PM10). (C) 2002 Published by Elsevier Science Ltd.