期刊
INDOOR AIR
卷 28, 期 6, 页码 806-817出版社
WILEY
DOI: 10.1111/ina.12504
关键词
air disinfection; bacteria susceptibility; indoor air quality; in-duct UVGI; irradiance; UV dose
类别
资金
- Research Grants Council, University Grants Committee [11210015]
- Natural Science Foundation of Guangdong Province Education Department, China [2015KQNCX055]
A full-scale ventilation duct ultraviolet germicidal irradiation (in-duct UVGI) system was designed to investigate its disinfection efficacy on five airborne pathogens: Serratia marcescens, Pseudomonas alcaligenes, Escherichia coli, Salmonella enterica, and Staphylococcus epidermidis, with airflow Reynolds numbers from 4 x 10(4) to 8 x 10(4). By varying the UV intensity, the susceptibility constants (Z-values) of the bacteria were experimentally determined to be 1.2, 1.0, 0.60, 0.39, and 0.37 m(2)/J for S.marcescens, P.alcaligenes, E.coli, S.enterica, and S.epidermidis, respectively. The disinfection efficacy was numerically investigated on the basis of the predicted irradiance, which included emissive irradiance and diffuse refection irradiance. The results suggest that it is vital to properly evaluate the UV dose (irradiance intensity) received by airborne bacteria to determine their Z-values. In-duct UVGI inactivated nearly all of the test bacteria with Reynolds numbers of 4 x 10(4) (inlet velocity = 3 m/s), and the disinfection efficacy decreased as Reynolds numbers increased. The in-duct UVGI system would potentially provide a supplementary solution for improving indoor air quality (IAQ) within mechanical ventilated/air-conditioned environment.
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