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Development of a new laboratory test methodology for rapid ageing of HVAC filters.

Number: 3228

Author(s) : HUANG C., CHUANG T-K., GOMES I., AJALA L., CRAM E. P., JUNG N., BOOR B. E.

Summary

Air filters installed in residential and commercial HVAC systems encounter a complex mixture of aerosols of outdoor and indoor origin during their service life. Standardized laboratory test methodologies are important for evaluating the loading behavior of HVAC filters. Loading aerosols commonly used to age HVAC filters include various test dusts (ISO-12103-1-A2, ISO-12103-1-A4, ASHRAE Test Dust) that are primarily composed of coarse mode particles (1 to 100 μm). However, urban aerosol mass size distributions often feature a prominent accumulation mode between 0.1 and 1 μm that is not well represented by traditional loading aerosols. The aim of this study is to develop a new laboratory test methodology for rapid ageing of HVAC filters with a representative urban aerosol mass size distribution at a high concentration to better predict long-term changes in HVAC filter performance. A HVAC filter test rig was custom designed and built following ASHRAE 52.2 specifications to artificially age HVAC filters with sub-micron potassium chloride (KCl) aerosol produced by a thermal aerosol generator. The KCl aerosol is formed by burning KCl sticks in a high temperature oxygen-propane flame and is delivered to the test rig via a damper-controlled intake duct. The results demonstrate that the new sub-micron KCl loading aerosol is a time- and cost-effective technique to artificially age HVAC filters with a particle mass size distribution representative of that found in HVAC installations in buildings.

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  • Original title: Development of a new laboratory test methodology for rapid ageing of HVAC filters.
  • Record ID : 30032949
  • Languages: English
  • Source: 2024 Purdue Conferences. 8th International High Performance Buildings Conference at Purdue.
  • Publication date: 2024/07/15

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