Abstract
Exposure to particulate matter could cause a wide range of adverse health effects on human beings, which has widely drawn attention. Filtration applications can effectively remove particles and reduce the risk of diseases for humans. Electret media have been often used in residences and commercial buildings due to the permanently charged fibers that contribute to the higher efficiency and lower pressure. However, the efficiency of electret filters would decrease with the increasing loaded dust. To investigate the loading performances of electret media, long-term loading tests were conducted to obtain the time-dependent efficiencies of medium- and high-efficiency electret media that were challenged with polydisperse potassium chloride (KCl) and diethylhexyl sebacate (DEHS) particles, respectively. Results showed that there was no reduction in efficiency of high-efficiency electret media while loaded by KCl. In contrast, the efficiency of high-efficiency electret media increased continually with the increasing loaded KCl mass. However, the efficiency of medium electret media firstly declined and then increased with the accumulation of KCl particles on fibers. The different loading characteristics between medium- and high-efficiency electret media were related to the mechanical structures and charges in fibers. Moreover, efficiencies of medium- and high-efficiency electret media both decreased as a function of deposited particles when electret media were exposed to DEHS. The decline of efficiency was attributed to the factor that the thin liquid film around faces of fibers formed by deposited DEHS particles degraded the electric filed, which was different with the dendrite structures formed by KCl particles.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Kim, J., Jasper, W., Barker, R.L., et al.: Application of electrostatic force microscopy on characterizing an electrically charged fiber. Fibers Polym. 11(5), 775–781 (2010)
Wang, C.: Electrostatic forces in fibrous filters – a review. Powder Technol. 118(1–2), 166–170 (2001)
Yang, Z.Z., Lin, J.H., Tsai, I.S., et al.: Particle filtration with an electret of nonwoven polypropylene fabric. Text. Res. J. 72, 1099–1104 (2002)
Gao, S., Kim, J., Yermakov, M., et al.: Penetration of combustion aerosol particles through filters of NIOSH-certified filtering facepiece respirators (FFRs). J. Occup. Environ. Hyg. 12(10), 678–685 (2015)
Kim, J., Gao, S., Yermakov, M., et al.: Performance of electret filters for use in a heating, ventilation and air conditioning system and an automotive cabin against combustion and NaCl particles. Aerosol Air Qual. Res. 16(6), 1523–1531 (2016)
Myers, D.L., Arnold, B.D.: Mechano-electret filtration media: synergy of structure and electrostatic charge. Filtr. Sep. 40(5), 24–27 (2003)
Lehtimäki, M., Heinonen, K.: Reliability of electret filters. Build. Environ. 29(3), 353–355 (1994)
Biermann, A.H., Lum, B.Y., Bergman, W.: Evaluation of permanently charged electro fibrous filters. In: Proceedings of the 17th Department of Energy Nuclear Air Cleaning Conference, Denver, pp. 523–547 (1982)
Li, K., Jo, Y.M.: Dust collection by a fiber bundle electret filter in an MVAC system. Aerosol Sci. Technol. 44(7), 578–587 (2010)
Walsh, D.C., Stenhouse, J.I.T.: The effect of particle size, charge, and composition on the loading characteristics of an electrically active fibrous filter material. J. Aerosol Sci. 28(2), 307–321 (1997)
Ji, J.H., Bae, G.N., Kanga, S.H., et al.: Effect of particle loading on the collection performance of an electret cabin air filter for submicron aerosols. J. Aerosol Sci. 34(11), 1493–1504 (2003)
Raynor, P.C., Chae, S.J.: The long-term performance of electrically charged filters in a ventilation system. J. Occup. Environ. Hyg. 1(7), 463–471 (2004)
Tang, M., Chen, S.C., Chang, D.Q., et al.: Filtration efficiency and loading characteristics of PM 2.5, through composite filter media consisting of commercial HVAC electret media and nanofiber layer. Sep. Purif. Technol. 198(8), 137–145 (2018)
Rengasamy, S., Miller, A., Vo, E.: Filter performance degradation of electrostatic N95 and P100 filtering facepiece respirators by dioctyl phthalate aerosol loading. J. Eng. Fabr. Fibers 8(3), 62–69 (2013)
Xia, J.: Study on Decaying Mechanism of Electret Fibrous Filter. Tongji University, Shanghai (2013)
Brown, R.C., Wake, D., Gray, R., et al.: Effect of industrial aerosols on the performance of electrically charged filter material. Ann. Occup. Hyg. 32(3), 271–294 (1988)
Lin, Z., Chen, X., Xia, J., et al.: Experimental study on mechanism of static electricity attenuation for fibrous filter medium. J. Tongji Univ. (Nat. Sci.) 43, 771–776 (2015)
Tennal, K.B., Mazumder, M.K., Siag, A., et al.: Effect of loading with an oil aerosol on the collection efficiency of an electret filter. Part. Sci. Technol. 9(1–2), 19–29 (1991)
Acknowledgements
The study has been supported by the China National Key R&D Program ‘Energy-saving design and key technical equipment development for clean air-conditioning plants’ (Grant No. 2018YFC0705202).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Wang, Y., Lin, Z., Zhang, W. (2020). Effect of Particle Composition on the Continuous Loading Performance of Medium- and High-Efficiency Electret Media. In: Wang, Z., Zhu, Y., Wang, F., Wang, P., Shen, C., Liu, J. (eds) Proceedings of the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019). ISHVAC 2019. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-9520-8_49
Download citation
DOI: https://doi.org/10.1007/978-981-13-9520-8_49
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-9519-2
Online ISBN: 978-981-13-9520-8
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)