Description

This paper is based on findings resulting from ASHRAE Research Project RP-1360.

Research project RP-1360 investigated the nature of dust collected on general ventilation air filters and how the filter performance changes over time due at least in part to the collection of that dust. The project was undertaken with a twopronged approach designed to maximize the information collected. The "Four-City Study" investigated the performance of in-situ filters over their lifetimes for pressure drop, dust weight gain, and changes in filtration efficiency. This portion of the project also compared ANSI/ASHRAE Standard 52.2-2007, Method of Testing General Ventilation Air- Cleaning Devices for Removal Efficiency by Particle Size, testing, with and without Appendix J conditioning, and ASHRAE Guideline 26-2008, Guideline for Field Testing of General Ventilation Devices and Systems for Removal Efficiency In-Situ by Particle Size and Resistance to Flow, fieldtests to in-situ filter performance.

To investigate the nature of dust collected by filters for a large number of locations, a "Multi-City Study" was undertaken. This study focused solely on properties of the dust collected on filters and included the dust’s elemental composition, organic and inorganic carbon content, particle morphology, the presence of fibers, and dust color. Significant project results are described. For example, filter efficiency as it changes over time is not well represented by the dust loading steps in the ASHRAE Standard 52.2 test. The Appendix J conditioning step was needed to bracket the minimum in-situ efficiency of the electret filter. Reporting values calculated from the minimum efficiency curve are much more relevant to in-situ performance than the use of average or final dust-loaded values. There was a clear distinction between the dust collected from commercial sites (mainly aluminosilicates) and that from residential sites (mainly dander). Dust on HVAC filters does not match ASHRAE dustfor chemical composition.

Product Details

Published:

2014

Number of Pages:

16

File Size:

1 file , 8.1 MB

Product Code(s):

D-NY-14-032

Note:

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