Abstract
This paper summarizes an improved methodology for predicting the rate of airstream disinfection for UVGI systems that will enable effective designs and lower energy costs. This approach uses radiative view factors to define the three-dimensional intensity field for lamps and reflective surfaces inside enclosures. Lamp photosensor data for a variety of lamps are shown to agree more closely with the view factor model than with models using the Inverse Square Law. The intensity field due to reflectivity from internal surfaces is determined by assuming diffuse reflectivity. An analytical method is used to determine the inter-reflection component of intensity due to multiple internal reflections. The superposition of these components yields a three-dimensional intensity field matrix that can be used to calculate disinfection rates for any given microbial rate constant. Results from laboratory bioassays using S. marcescens in various duct configurations have corroborated model predictions within ±15% in most cases.
| Original language | English (US) |
|---|---|
| Journal | ASHRAE Transactions |
| Volume | 106 |
| State | Published - Dec 1 2000 |
| Event | 2000 Annual Meeting of the American Society of Heating, Refrigerating and Air-Conditioning Engineerings, INC - Minneapolis, MN, USA Duration: Jun 25 2000 → Jun 28 2000 |
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All Science Journal Classification (ASJC) codes
- Building and Construction
- Mechanical Engineering
Cite this
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Effective UVGI system design through improved modeling. / Kowalski, W. J.; Bahnfleth, William P.
In: ASHRAE Transactions, Vol. 106, 01.12.2000.Research output: Contribution to journal › Conference article
TY - JOUR
T1 - Effective UVGI system design through improved modeling
AU - Kowalski, W. J.
AU - Bahnfleth, William P.
PY - 2000/12/1
Y1 - 2000/12/1
N2 - This paper summarizes an improved methodology for predicting the rate of airstream disinfection for UVGI systems that will enable effective designs and lower energy costs. This approach uses radiative view factors to define the three-dimensional intensity field for lamps and reflective surfaces inside enclosures. Lamp photosensor data for a variety of lamps are shown to agree more closely with the view factor model than with models using the Inverse Square Law. The intensity field due to reflectivity from internal surfaces is determined by assuming diffuse reflectivity. An analytical method is used to determine the inter-reflection component of intensity due to multiple internal reflections. The superposition of these components yields a three-dimensional intensity field matrix that can be used to calculate disinfection rates for any given microbial rate constant. Results from laboratory bioassays using S. marcescens in various duct configurations have corroborated model predictions within ±15% in most cases.
AB - This paper summarizes an improved methodology for predicting the rate of airstream disinfection for UVGI systems that will enable effective designs and lower energy costs. This approach uses radiative view factors to define the three-dimensional intensity field for lamps and reflective surfaces inside enclosures. Lamp photosensor data for a variety of lamps are shown to agree more closely with the view factor model than with models using the Inverse Square Law. The intensity field due to reflectivity from internal surfaces is determined by assuming diffuse reflectivity. An analytical method is used to determine the inter-reflection component of intensity due to multiple internal reflections. The superposition of these components yields a three-dimensional intensity field matrix that can be used to calculate disinfection rates for any given microbial rate constant. Results from laboratory bioassays using S. marcescens in various duct configurations have corroborated model predictions within ±15% in most cases.
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M3 - Conference article
AN - SCOPUS:0034460895
VL - 106
JO - ASHRAE Transactions
JF - ASHRAE Transactions
SN - 0001-2505
ER -