文献类型：期刊文献

英文题名：Disinfection efficacy of ultraviolet germicidal irradiation on airborne bacteria in ventilation ducts

作者：Yang, Yi[1,2];Zhang, Huihui[3];Nunayon, Sunday Segbenu[3];Chan, Vincent[4];Lai, Alvin C. K.[3]

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang, Peoples R China;[2]Cent S Univ, Sch Energy Sci & Engn, Changsha, Hunan, Peoples R China;[3]City Univ Hong Kong, Dept Architecture & Civil Engn, Tat Chee Ave, Kowloon, Hong Kong, Peoples R China;[4]Khalifa Univ, Dept Bioengn, Abu Dhabi, U Arab Emirates

年份：2018

卷号：28

期号：6

起止页码：806

外文期刊名：INDOOR AIR

收录：SCI-EXPANDED(收录号：WOS:000447285600003)、、EI(收录号：20231713963702)、Scopus(收录号：2-s2.0-85054185427)、WOS

基金：Research Grants Council, University Grants Committee, Grant/Award Number: 11210015; Natural Science Foundation of Guangdong Province Education Department, China, Grant/Award Number: 2015KQNCX055

语种：英文

外文关键词：air disinfection; bacteria susceptibility; indoor air quality; in-duct UVGI; irradiance; UV dose

外文摘要：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.