Department of Mechanical Engineering, University of Colorado Boulder, 1111 Engineering Drive, 427 UCB, Boulder, CO 80309, USA.
Architectural Engineering Department, Pennsylvania State University, 104 Engineering Unit A, University Park, PA 16802, USA.
Environ Sci Process Impacts. 2021 Nov 17;23(11):1706-1717. doi: 10.1039/d1em00259g.
We spend most of our time in built environments. The cumulative exposure to particulate matter (PM) occurring in these built environments can potentially be comparable to or even exceed that occurring outdoors. Therefore, it is critical to understand the sources, dynamics, and fate of PM in built environments. This work focuses on aerosol dynamics modeling (including coagulation, deposition, and exfiltration) of sub-500 nm particles measured inside a test house during the HOMEChem campaign while performing prescribed cooking activities. Deposition characteristics of the test house, emission rates and factors, and the fate of particles are presented. Number emission rates calculated for two different heat sources (stove and hot plate) and the various meals cooked on them were highest for sub-10 nm particles. Coagulation and deposition contributed comparably to the particle number concentration decay. Most of the PM (90% number-based and 70% mass-based) deposited within the house while the remaining fraction left the test house volume exfiltration. Simulation results show that while increased air exchange rate reduces indoor PM mass concentration, it can lead to increased number concentration. An increase from 0.5 to 5 ACH (comparable to the equivalent air change rate from running a well-dimensioned portable air cleaner) would result in a 70% reduction in PM mass-based exposure while a further increase from 5 to 20 ACH would only result in an additional 21% reduction.
我们大部分时间都在建筑环境中度过。在这些建筑环境中累积暴露于颗粒物（PM）的程度可能与室外相当，甚至超过室外。因此，了解建筑环境中 PM 的来源、动态和归宿至关重要。这项工作专注于在 HOMEChem 期间在测试房中进行规定烹饪活动时测量的亚 500nm 颗粒的气溶胶动力学模型（包括凝聚、沉积和渗出）。介绍了测试房的沉积特性、排放率和因子以及颗粒的归宿。针对两种不同热源（炉灶和热板）和在其上烹饪的各种饭菜计算得出的数排放率对于小于 10nm 的颗粒最高。凝聚和沉积对颗粒数浓度衰减的贡献相当。大部分 PM（基于数的 90%和基于质量的 70%）沉积在室内，而其余部分通过渗出离开测试房体积。模拟结果表明，虽然增加空气交换率可以降低室内 PM 质量浓度，但会导致数浓度增加。从 0.5 到 5 ACH（相当于运行尺寸合适的便携式空气净化器的空气交换率）的增加将导致基于质量的 PM 暴露降低 70%，而从 5 到 20 ACH 的进一步增加仅导致额外降低 21%。
