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EFFECT OF LOADING DUST TYPE ON THE FILTRATION EFFICIENCY OF ELECTROSTATICALLY CHARGED FILTERS
Citation:
Hanley, J. T., D. S. Ensor, K. K. Foarde, AND L E. Sparks*. EFFECT OF LOADING DUST TYPE ON THE FILTRATION EFFICIENCY OF ELECTROSTATICALLY CHARGED FILTERS. Presented at Indoor Air '99, Edinburgh, Scotland, 8/8-13/99.
Description:
The paper gives results of an evaluation of the effect of loading dust type on the filtration efficiency of electrostatically charged filters. Three types of filters were evaluated: a rigid-cell filter charged using an electrodynamic spinning process, a pleated-panel filter charged using a corona charging process, and a residential filter charged using a split-fiber process. The filtration efficiency measurements covered a 0.3-10 micrometer diameter size range. Exposures consisted of outdoor ambient air, in-home air, American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE) dust, ASHRAE dust without carbon black, and a submicrometer salt aerosol. Results show that all the ambient and in-home exposed filters had substantial decreases in filtration efficiency. Laboratory tests using draft ASHRAE 52.2P procedures did not reproduce these results well, often showing either little change or increases with loading, rather than decreases. The submicrometer salt aerosol came closest to duplicating the outdoor and in-home aerosol exposure results, although the magnitude of the efficiency decrease was underestimated in some cases.