Collection of Aerosols in HEPA Filters
ATOMIC ENERGY RESEARCH ESTABLISHMENT HARWELL (UNITED KINGDOM)
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The investigation of the performance of HEPA filters of both minipleat and conventional deep pleat designs has continued at Harwell. Samples of filters from several manufacturers have been tested against the UKEABNF pls filter purchasing specification. No unexpected problems have come to light in these tests, apart from some evidence to suggest that although meeting the specification minipleat filters are inherently weaker in burst strength terms than conventional filters. In addition tests have been carried out to investigate the dust loading versus pressure drop characteristics of both designs of filters using a range of test dusts - ASHRAE dust, carbon black, BS2831 No 2 test dust and sodium chloride. Initial results previously reported suggested that the early whims for improved dust holding combined with higher air throughputs were exaggerated and concluded that designers would need to choose between reduced plant room size or reduced filter useage. Subsequent work has reinforced this view. In parallel with this laboratory test work a more fundamental study of the effects of geometric arrangement of filter media within the filter frame has been carried out on behalf of the UKAEA by Loughborough University.
- Physical Chemistry