The long-term performance of electrically charged filters in a ventilation system

Journal of Occupational and Environmental Hygiene
P C Raynor, Soo Jae Chae

Abstract

The efficiency and pressure drop of filters made from polyolefin fibers carrying electrical charges were compared with efficiency and pressure drop for filters made from uncharged glass fibers to determine if the efficiency of the charged filters changed with use. Thirty glass fiber filters and 30 polyolefin fiber filters were placed in different, but nearly identical, air-handling units that supplied outside air to a large building. Using two kinds of real-time aerosol counting and sizing instruments, the efficiency of both sets of filters was measured repeatedly for more than 19 weeks while the air-handling units operated almost continuously. Pressure drop was recorded by the ventilation system's computer control. Measurements showed that the efficiency of the glass fiber filters remained almost constant with time. However, the charged polyolefin fiber filters exhibited large efficiency reductions with time before the efficiency began to increase again toward the end of the test. For particles 0.6 microm in diameter, the efficiency of the polyolefin fiber filters declined from 85% to 45% after 11 weeks before recovering to 65% at the end of the test. The pressure drops of the glass fiber filters increased by about 0.40 in. H2...Continue Reading

References

Jul 1, 1992·American Industrial Hygiene Association Journal·W A Heitbrink, P A Baron
Aug 25, 2000·Applied Occupational and Environmental Hygiene·E S Moyer, M S Bergman

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Citations

Nov 8, 2006·Journal of Occupational and Environmental Hygiene·Stephen MartinPaul Jensen
Dec 13, 2006·Journal of Occupational and Environmental Hygiene·Ernest S MoyerStephen P Berardinelli
Jun 20, 2007·American Journal of Infection Control·Stefan A SaraviaAndrew J Streifel
Dec 18, 2019·Indoor Air·Tianyuan Li, Jeffrey A Siegel
Mar 23, 2021·Advanced Science·Sejin ChoiSung Yeon Hwang

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