Influence of Mechanical Ventilation Systems and Human Occupancy on Time-Resolved Source Rates of Volatile Skin Oil Ozonolysis Products in a LEED-Certified Office Building
Influence of Mechanical Ventilation Systems and Human Occupancy on Time-Resolved Source Rates of Volatile Skin Oil Ozonolysis Products in a LEED-Certified Office Building
复制标题
机械通风系统和人类居住对 LEED 认证办公楼中挥发性皮肤油臭氧分解产品时间分辨源速率的影响
DOI：
10.1021/acs.est.1c03112
复制
发表时间：
2021
影响因子：
11.4
通讯作者：
Boor, Brandon E.
中科院分区：
文献类型：
--
作者：
Wu, Tianren;Tasoglou, Antonios;Huber, Heinz;Stevens, Philip S.;Boor, Brandon E.
建筑机械通风系统是室内空气化学的主要驱动力，因为它们的设计和操作会影响室内臭氧（O3）浓度，室内产生的挥发性有机化合物（VOC）的稀释和运输以及室内环境条件。将实时VOC和O3测量与建筑传感平台相结合，以评估冬季LEED认证建筑中办公室内机械通风模式和人体占用对皮肤油臭氧分解产品（SOOP）动态的影响。通风系统在从RR = 0（100%室外空气）到RR = 1（100%再循环空气）的可变再循环比（RR）下操作。6-甲基-5-庚烯-2-酮（6-MHO）、4-氧代戊醛（4-OPA）和癸醛的时间分辨源速率是高度动态的，并且随着RR和占用率而全天变化。高占用时段（10：00-18：00）的SOOP总源率在RR = 0.1时的2500-3000 μg h-1和RR = 1时的6300-6700 μg h-1之间变化。源率气相反应，室外空气，和居住者相关的排放量普遍下降，增加RR。再循环空气源率随RR的增加而增加，当RR > 0.5时，再循环空气源率通常成为主导源。来自地表水库的SOOP排放也是一个突出的来源，占总来源率的10-50%。观察到人均SOOP排放因子升高，可能是由于冬季穿着多层脏衣服。
Building mechanical ventilation systems are a major driver of indoor air chemistry as their design and operation influences indoor ozone (O3) concentrations, the dilution and transport of indoor-generated volatile organic compounds (VOCs), and indoor environmental conditions. Real-time VOC and O3measurements were integrated with a building sensing platform to evaluate the influence of mechanical ventilation modes and human occupancy on the dynamics of skin oil ozonolysis products (SOOPs) in an office in a LEED-certified building during the winter. The ventilation system operated under variable recirculation ratios (RRs) from RR = 0 (100% outdoor air) to RR = 1 (100% recirculation air). Time-resolved source rates for 6-methyl-5-hepten-2-one (6-MHO), 4-oxopentanal (4-OPA), and decanal were highly dynamic and changed throughout the day with RR and occupancy. Total SOOP source rates during high-occupancy periods (10:00–18:00) varied from 2500–3000 μg h–1when RR = 0.1 to 6300–6700 μg h–1when RR = 1. Source rates for gas-phase reactions, outdoor air, and occupant-associated emissions generally decreased with increasing RR. The recirculation air source rate increased with RR and typically became the dominant source for RR > 0.5. SOOP emissions from surface reservoirs were also a prominent source, contributing 10–50% to total source rates. Elevated per person SOOP emission factors were observed, potentially due to multiple layers of soiled clothing worn during winter.