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Title: Particle size for greatest penetration of HEPA filters - and their true efficiency

Abstract

The particle size that most greatly penetrates a filter is a function of filter media construction, aerosol density, and air velocity. In this paper the published results of several experiments are compared with a modern filtration theory that predicts single-fiber efficiency and the particle size of maximum penetration. For high-efficiency particulate air (HEPA) filters used under design conditions this size is calculated to be 0.21 ..mu..m diam. This is in good agreement with the experimental data. The penetration at 0.21 ..mu..m is calculated to be seven times greater than at the 0.3 ..mu..m used for testing HEPA filters. Several mechanisms by which filters may have a lower efficiency in use than when tested are discussed.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6241348
Report Number(s):
UCRL-53311
ON: DE83008439
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AEROSOLS; FILTRATION; FILTERS; EFFICIENCY; RADIOACTIVE AEROSOLS; AIR POLLUTION; AIR POLLUTION CONTROL; COMPARATIVE EVALUATIONS; DENSITY; PARTICLE SIZE; REVIEWS; VELOCITY; COLLOIDS; CONTROL; DISPERSIONS; DOCUMENT TYPES; PHYSICAL PROPERTIES; POLLUTION; POLLUTION CONTROL; SEPARATION PROCESSES; SIZE; SOLS; 500200* - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989); 500300 - Environment, Atmospheric- Radioactive Materials Monitoring & Transport- (-1989)

Citation Formats

da Roza, R.A. Particle size for greatest penetration of HEPA filters - and their true efficiency. United States: N. p., 1982. Web. doi:10.2172/6241348.
da Roza, R.A. Particle size for greatest penetration of HEPA filters - and their true efficiency. United States. doi:10.2172/6241348.
da Roza, R.A. Wed . "Particle size for greatest penetration of HEPA filters - and their true efficiency". United States. doi:10.2172/6241348. https://www.osti.gov/servlets/purl/6241348.
@article{osti_6241348,
title = {Particle size for greatest penetration of HEPA filters - and their true efficiency},
author = {da Roza, R.A.},
abstractNote = {The particle size that most greatly penetrates a filter is a function of filter media construction, aerosol density, and air velocity. In this paper the published results of several experiments are compared with a modern filtration theory that predicts single-fiber efficiency and the particle size of maximum penetration. For high-efficiency particulate air (HEPA) filters used under design conditions this size is calculated to be 0.21 ..mu..m diam. This is in good agreement with the experimental data. The penetration at 0.21 ..mu..m is calculated to be seven times greater than at the 0.3 ..mu..m used for testing HEPA filters. Several mechanisms by which filters may have a lower efficiency in use than when tested are discussed.},
doi = {10.2172/6241348},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 1982},
month = {Wed Dec 01 00:00:00 EST 1982}
}

Technical Report:

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