Estimating the effects of ambient conditions and aging on the performance of UVGI air cleaners

Josephine Lau, W. Bahnfleth, J. Freihaut

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Ultraviolet germicidal irradiation (UVGI) uses UVC radiation produced by low pressure Hg vapor lamps to control biological air contaminants. Lamp UV output depends on multiple factors, including accumulated operating time (age) and the thermal effects of ambient air temperature and velocity. Additionally, the life of some lamp types depends on the frequency of on-off cycles. Models of lamp life as a function of cycling rate and lamp output as a function of age and ambient conditions are developed for three common standard output lamp types based on heat transfer theory and manufacturer's lamp performance data. Example results are presented and a parametric study in the form of a 3 k factorial experiment is used to identify significant factors affecting output and their interactions. A typical range of ambient conditions reduces lamp output by more than 30% of rated capacity and the inclusion of aging effects reduces capacity by as much as 70%. For given ambient conditions, performance varies substantially across lamp types due to their differing heat transfer characteristics. It is concluded that short term and long term variation of lamp output is highly significant and that modeling of such effects is necessary for accurate system design and analysis.

Original languageEnglish (US)
Title of host publicationIAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
Subtitle of host publicationSustainable Built Environment
Pages557-564
Number of pages8
Volume2
StatePublished - 2007
Externally publishedYes
Event6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007 - Sendai, Japan
Duration: Oct 28 2007Oct 31 2007

Other

Other6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007
CountryJapan
CitySendai
Period10/28/0710/31/07

Fingerprint

Air cleaners
Electric lamps
Aging of materials
Irradiation
Systems analysis
Heat transfer
Ultraviolet lamps
Air
Vapor pressure
Thermal effects
Impurities
Radiation

Keywords

  • Indoor air quality
  • Ultraviolet germicidal irradiation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment

Cite this

Lau, J., Bahnfleth, W., & Freihaut, J. (2007). Estimating the effects of ambient conditions and aging on the performance of UVGI air cleaners. In IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment (Vol. 2, pp. 557-564)

Estimating the effects of ambient conditions and aging on the performance of UVGI air cleaners. / Lau, Josephine; Bahnfleth, W.; Freihaut, J.

IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment. Vol. 2 2007. p. 557-564.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lau, J, Bahnfleth, W & Freihaut, J 2007, Estimating the effects of ambient conditions and aging on the performance of UVGI air cleaners. in IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment. vol. 2, pp. 557-564, 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment, IAQVEC 2007, Sendai, Japan, 10/28/07.
Lau J, Bahnfleth W, Freihaut J. Estimating the effects of ambient conditions and aging on the performance of UVGI air cleaners. In IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment. Vol. 2. 2007. p. 557-564
Lau, Josephine ; Bahnfleth, W. ; Freihaut, J. / Estimating the effects of ambient conditions and aging on the performance of UVGI air cleaners. IAQVEC 2007 Proceedings - 6th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings: Sustainable Built Environment. Vol. 2 2007. pp. 557-564
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