Charged ultrafine particle filtration through vehicular cabin air filters--颗粒学报PARTICUOLOGY

Xu, B., Gong, Y., & Wu, Y. (2016). Charged ultrafine particle filtration through vehicular cabin air filters. Particuology, 28, 1-5. https://doi.org/10.1016/j.partic.2015.09.012

Charged ultrafine particle filtration through vehicular cabin air filters

Bin Xu ^{a b *}, Yu Gong ^a, Ya Wu ^a

a Department of Environmental Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
b Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Shanghai 200433, China

10.1016/j.partic.2015.09.012

Volume 28, October 2016, Pages 1-5

Received 4 December 2014, Revised 8 September 2015, Accepted 24 September 2015, Available online 7 January 2016, Version of Record 4 August 2016.

E-mail: binxu@tongji.edu.cn

Highlights

• Effect of electric charge of vehicular particles on the cabin air filter's filtration was studied.

• Filter media played an important role on the filtration efficiency.

• Empirical modification improved estimation of filtration efficiency for effect of electric charge.

Abstract

Understanding the effectiveness of cabin air filters is important for assessing human exposure to ultrafine particles (UFPs) of vehicular origin. The filtration efficiency of vehicular UFPs with electric charges was investigated for different electric charge characteristics (charge state, charge polarity). The average filtration efficiency increased ∼10% as the electric charge state on the particles changed in distribution from lightly charged to highly charged. The enhancement of filtration efficiency due to electric charge was different at various filter-face air velocities. As electric charges increased, the filtration efficiency increased 12% and 9% at low air velocity (0.1 m/s) and high air velocity (0.5 m/s), respectively. The filter fiber material poses somewhat effect on the filtration efficiency change due to the electric charge. The effects of filter usage and charge polarity on filtration efficiency due to the electric charge were negligible. A coefficient was empirically derived and successfully accounts for the electric charge effect on UFP filtration efficiency.

Graphical abstract

Keywords

Particle filtration; Electric charge; Filtration efficiency; Vehicular particle

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