期刊
BUILDING AND ENVIRONMENT
卷 171, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2020.106669
关键词
Indoor air quality; Relative humidity; Particle hygroscopicity; Electret filter; Efficiency decline; Holding capacity
资金
- Program for Changjiang Scholars in China University of Mining and Technology [IRT_17R103]
- Innovative Research Team in China University of Mining and Technology [IRT_17R103]
- Fundamental Research Funds for the Central Universities [2018CXTD01]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- China Scholarship Council, China
- A.O. Smith Company
- Applied Materials
- BASF Corporation
- Boeing Company
- Corning Inc.
- China Yancheng Environmental Protection Science and Technology City
- Cummings Foundation
- Donaldson Company, Inc.
- Ford Motor Company
- Guangxi Wat Yuan Filtration System Co., Ltd
- Mott Corporation
- MSP Corporation
- Samsung Electronics
- ParkerHannifin Corporation
- Shigematsu Works Co. Ltd.
- TSI Inc.
- W. L. Gore & Associates, Inc.
- Xinxiang Shengda Filtration Technique Co. Ltd.
- National Institute for Occupational Safety and Health (NIOSH)
Because of the low pressure drop, electret filter media are widely used in indoor environments to remove particles for air quality control. The effects of water soaking, air relative humidity (RH), and particle hygroscopicity on the filtration performances of fresh and aged media, i.e., size-fractioned efficiency, however remains unclear. Electret media from a commercial high-efficiency particulate air (HEPA) filter, a commercial Heating, Ventilating, and Air Conditioning (HVAC) filter with minimum efficiency reporting value of 13 (MERV13) and a homemade filter (CM) were investigated in this work. In the initial test, the performance of above three media were evaluated at 10, 60 and 90% RHs. In the aged test, the media performances were characterized at 30, 60 and 80%, and using three different sample particles, i.e., hygroscopic NaCl, non-hygroscopic SiC, and NaCl + SiC mixture). In addition to clean filters, the collection efficiency and pressure drop of used MERV13 electret media, which had been utilized in a house for few months, were evaluated. SEM analysis was conducted to examine particle loading characteristics. The major finding of this study is that operating the filtration systems having electret media at similar to 60% RH can greatly enhance the particle holding capacity and minimize the efficiency decline. The result of this study provides the insights of the RH effects on the performance of electret media.
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