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Title: Effect of DOP heterodispersion on HEPA-filter-penetration measurements

Abstract

The accuracy of the standard US test method for certifying High-Efficiency Particulate Air (HEPA) filters has been in question since the finding by Hinds, et al. that the dioctyl phthalate (DOP) aerosol used in the test is not monodisperse as had been assumed and that particle-size analyzers, or owls, could not distinguish between different particle-size distributions with the same owl reading. We have studied theoretically and experimentally the filter efficiency for different DOP size distributions with the same owl reading. Our studies show that the effect of varying DOP size distributions on the measured HEPA-filter penetration depends on the light-scattering-photometer response and on the HEPA-filter penetration curve, both measured as a function of particle size. HEPA-filter penetration for a heterodisperse DOP aerosol may be increased, decreased, or remain the same when compared to the filter penetration for monodisperse aerosols. Using experimental HEPA-filter penetration and photometer response curves, we show that heterodisperse DOP aerosols (D/sub cmd/ 0.19 and sigma g = 1.4) yield 24% lower penetrations than that for monodisperse DOP aerosols (D/sub cmd/ = 0.3 and sigma g = 1.0). This surprisingly small effect of the DOP heterodispersion on HEPA-filter penetration is due to the response function of the owlmore » that is similar to the response of the photometer. Changes in the particle-size distribution are therefore seen in a similar fashion by both the photometer and the owl. We also show that replacing the owl with modern particle-size spectrometers may lead to large errors in filter penetration because the particle-size spectrometers do not provide measurements that correspond to the photometer measurements. 15 references, 16 figures.« less

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6030486
Report Number(s):
UCRL-91122; CONF-840806-14
ON: DE85009583
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Conference: 18. DOE nuclear airborne waste management and air cleaning conference, Baltimore, MD, USA, 13 Aug 1984
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR FILTERS; PERFORMANCE TESTING; AEROSOLS; AIR CLEANING; COMPARATIVE EVALUATIONS; EXPERIMENTAL DATA; PARTICULATES; PHOTOMETERS; SIZE; SPECTROMETERS; CLEANING; COLLOIDS; DATA; DISPERSIONS; EQUIPMENT; FILTERS; INFORMATION; MEASURING INSTRUMENTS; NUMERICAL DATA; PARTICLES; POLLUTION CONTROL EQUIPMENT; SOLS; TESTING; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Bergman, W, and Biermann, A. Effect of DOP heterodispersion on HEPA-filter-penetration measurements. United States: N. p., 1984. Web. doi:10.2172/6030486.
Bergman, W, & Biermann, A. Effect of DOP heterodispersion on HEPA-filter-penetration measurements. United States. https://doi.org/10.2172/6030486
Bergman, W, and Biermann, A. 1984. "Effect of DOP heterodispersion on HEPA-filter-penetration measurements". United States. https://doi.org/10.2172/6030486. https://www.osti.gov/servlets/purl/6030486.
@article{osti_6030486,
title = {Effect of DOP heterodispersion on HEPA-filter-penetration measurements},
author = {Bergman, W and Biermann, A},
abstractNote = {The accuracy of the standard US test method for certifying High-Efficiency Particulate Air (HEPA) filters has been in question since the finding by Hinds, et al. that the dioctyl phthalate (DOP) aerosol used in the test is not monodisperse as had been assumed and that particle-size analyzers, or owls, could not distinguish between different particle-size distributions with the same owl reading. We have studied theoretically and experimentally the filter efficiency for different DOP size distributions with the same owl reading. Our studies show that the effect of varying DOP size distributions on the measured HEPA-filter penetration depends on the light-scattering-photometer response and on the HEPA-filter penetration curve, both measured as a function of particle size. HEPA-filter penetration for a heterodisperse DOP aerosol may be increased, decreased, or remain the same when compared to the filter penetration for monodisperse aerosols. Using experimental HEPA-filter penetration and photometer response curves, we show that heterodisperse DOP aerosols (D/sub cmd/ 0.19 and sigma g = 1.4) yield 24% lower penetrations than that for monodisperse DOP aerosols (D/sub cmd/ = 0.3 and sigma g = 1.0). This surprisingly small effect of the DOP heterodispersion on HEPA-filter penetration is due to the response function of the owl that is similar to the response of the photometer. Changes in the particle-size distribution are therefore seen in a similar fashion by both the photometer and the owl. We also show that replacing the owl with modern particle-size spectrometers may lead to large errors in filter penetration because the particle-size spectrometers do not provide measurements that correspond to the photometer measurements. 15 references, 16 figures.},
doi = {10.2172/6030486},
url = {https://www.osti.gov/biblio/6030486}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {8}
}