Removal of PM2.5 entering through the ventilation duct in an automobile using a carbon fiber ionizer-assisted cabin air filter

Title
Removal of PM2.5 entering through the ventilation duct in an automobile using a carbon fiber ionizer-assisted cabin air filter
Author(s)
변정훈박재홍[박재홍]윤기영[윤기영]노광철[노광철]황정호[황정호]
Keywords
PARTICLES; PERFORMANCE; EXPOSURE; CHARGE; STATE
Issue Date
201010
Publisher
ELSEVIER SCI LTD
Citation
JOURNAL OF AEROSOL SCIENCE, v.41, no.10, pp.935 - 943
Abstract
This study evaluated the charging characteristics of a carbon fiber ionizer for PM2.5 and carried out particle capture laboratory tests after an ionizer was installed upstream of the media of an electret cabin air filter. When the ion concentration per particle (N-i) of the carbon fiber charger was 10(6) ions/cm(3), the average charge numbers for each particle were 1.54, 0.88, and 0.49 at 0.6, 1.2, and 1.8 m/s of face velocity, respectively (the particle charging times, tau, were 167, 83, and 56 ms, respectively). For these face velocities, the PM2.5 removal efficiencies of the filter media were 69.3%, 65.2% and 62.2%. respectively, but increased to 80.4%, 71.2% and 65.5%, respectively, when the ionizer was turned on. The carbon fiber ionizer was then installed in front of an electret cabin filter in the air conditioning system of an automobile, after which field tests were performed at a roadside area. For the same N-i(tau) used in the lab-scale tests, the effects of the carbon fiber ionizer on increasing PM2.5 %Reduction were mild as 9.4%, 4.0%, and 2.8% when the flow rates were at the second, fourth, and sixth levels, respectively (the face velocities were 0.6, 1.2, and 1.8 m/s, respectively). The PM2.5 %Reduction can be substantially increased by 20-21%, for a higher value of N-i(tau) ( =1.0 x 10(8) ions s/cm(3)), which is realized by increasing the power consumption of the carbon fiber ionizer. (C) 2010 Elsevier Ltd. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/23515http://dx.doi.org/10.1016/j.jaerosci.2010.07.005
ISSN
0021-8502
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공과대학 > 기계공학부 > Articles
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