Real-time measurements of fluorescent aerosol particles in a living laboratory office under variable human occupancy and ventilation conditions
Real-time measurements of fluorescent aerosol particles in a living laboratory office under variable human occupancy and ventilation conditions
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DOI：
10.1016/j.buildenv.2021.108249
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发表时间：
2021-11
影响因子：
7.4
通讯作者：
S. Patra;Tianren Wu;Danielle N. Wagner;Jinglin Jiang;Brandon E. Boor
中科院分区：
文献类型：
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作者：
S. Patra;Tianren Wu;Danielle N. Wagner;Jinglin Jiang;Brandon E. Boor
室内环境中超微米生物和非生物颗粒的丰度可能受到人类相关排放和建筑通风条件随时间变化的影响。荧光气溶胶颗粒 (FAP) 的实时测量与建筑传感平台集成，以评估人类居住和通风对生活实验室办公室中荧光生物和非生物颗粒的时间动态的影响。通过激光诱导荧光 (LIF) 测量 FAP 的浓度和尺寸分布。人类居住者被确定为机械通风办公楼中超微米 FAP 的主要来源。大于 3 μm 的 FAP 的质量浓度和尺寸分布与办公室内的人员占用情况成比例。详细的单粒子荧光数据表明，与人类相关的排放物使办公室气氛变得更加丰富，具有形态各异的特定 FAP 类型。办公室居住者是 ABC 型粒子（数量和质量）的强发射者，并且在较小程度上是 A 型粒子（数量和质量）、AB 型粒子（质量）和 B 型粒子（质量）。此类 FAP 类型与常见的室内细菌和真菌气溶胶以及荧光服装织物纤维有关。通过双层玻璃幕墙引入自然通风，由于可以将室外 FAP 有效运输到办公室，因此增加了 FAP 的室内丰度。虽然 LIF 提供了有关室内 FAP 动态的宝贵实时数据，但它缺乏特异性，无法完全解析室内空间中荧光生物和非生物颗粒的起源。
The abundance of super-micron biological and abiotic particles in occupied indoor environments can be influenced by time-dependent changes in human-associated emissions and building ventilation conditions. Real-time measurements of fluorescent aerosol particles (FAPs) were integrated with a building sensing platform to evaluate the influence of human occupancy and ventilation on the temporal dynamics of fluorescent biological and abiotic particles in a living laboratory office. Concentrations and size distributions of FAPs were measured via laser-induced fluorescence (LIF). Human occupants were identified as a major source of super-micron FAPs in mechanically ventilated office buildings. Mass concentrations and size distributions of FAPs larger than 3 μm scaled with human occupancy in the office. Detailed single particle fluorescence data indicated that human-associated emissions enriched the office atmosphere with specific FAP types that varied in morphology. Office occupants were strong emitters of ABC-type particles (number and mass), and to a lesser extent, A-type particles (number and mass), AB-type particles (mass), and B-type particles (mass). Such FAP types are related to common indoor bacterial and fungal aerosols and fluorescent clothing fabric fibers. The introduction of natural ventilation via a double skin glass façade increased the indoor abundance of FAPs due to the efficient transport of outdoor FAPs into the office. While LIF provides valuable real-time data on indoor FAP dynamics, it lacks specificity and cannot fully resolve the origins of fluorescent biological and abiotic particles in indoor spaces.