Evaporation-condensation technology for testing the efficiency of HEPA filter media

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Abstract

Quasi-monodispersed aerosols can be generated by an evaporation-condensation generator. The aerosol characteristics and the differences between models and experiments need to be understood for testing the use of high efficiency particulate air (HEPA) filters to get both high measurement speeds and wide ranges of filters efficiencies. The size distributions of the aerosol particles generated by the evaporation-condensation generator are analyzed for various spring parameters through numerical simulations using the Euler-Lagrange modeling method and experimental measurements using a scanning mobility particle sizes (SMPS). The results show that the simulations are quite consistent with the experimental data, so the Euler-Lagrange modeling method can be applied to simulate aerosol growth in the condensation tube. Different sizes of high-concentration, quasi-monodisperse aerosols can be generated by changing the generator operating parameters. The size distribution not only meets the HEPA filter media efficiency testing standard but can also be used for ultra low penetration air (ULPA) filter media efficiency testing.

Keywords aerosol generation efficiency testing evaporation-condensation technology high efficiency particulate air (HEPA) filter media

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Issue Date: 15 May 2014

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	Feng JIANG
	Ziwei ZHUANG
	Zhenzhong ZHANG
	Jiying WEI

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Feng JIANG,Ziwei ZHUANG,Zhenzhong ZHANG, et al. Evaporation-condensation technology for testing the efficiency of HEPA filter media[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(5): 629-632.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I5/629

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