Understanding and controlling airborne organic compounds in the indoor environment: mass transfer analysis and applications.
Mass transfer is key to understanding and controlling indoor airborne organic chemical contaminants (e.g., VVOCs, VOCs, and SVOCs). In this study, we first introduce the fundamentals of mass transfer and then present a series of representative works from the past two decades, focusing on the most recent years. These works cover: (i) predicting and controlling emissions from indoor sources, (ii) determining concentrations of indoor air pollutants, (iii) estimating dermal exposure for some indoor gas-phase SVOCs, and (iv) optimizing air-purifying approaches. The mass transfer analysis spans the micro-, meso-, and macroscales and includes normal mass transfer modeling, inverse problem solving, and dimensionless analysis. These representative works have reported some novel approaches to mass transfer. Additionally, new dimensionless parameters such as the Little number and the normalized volume of clean air being completely cleaned in a given time period were proposed to better describe the general process characteristics in emissions and control of airborne organic compounds in the indoor environment. Finally, important problems that need further study are presented, reflecting the authors' perspective on the research opportunities in this area.
Institute of Built Environment, Tsinghua University, Beijing, China.
Y
Y
Zhang
School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China.
J
J
Xiong
Institute of Built Environment, Tsinghua University, Beijing, China.
J
J
Mo
Institute of Built Environment, Tsinghua University, Beijing, China.
M
M
Gong
Institute of Built Environment, Tsinghua University, Beijing, China.
J
J
Cao
D000393:Air Pollutants / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000517:prevention & control / Q000706:statistics & numerical data*; D004784:Environmental Monitoring
D000393:Air Pollutants
Air cleaning; Built environment; Exposure; Health risk; Indoor Air Quality (IAQ); Mass transfer