文献类型：期刊文献

英文题名：Development and experimental validation of a mathematical model for the irradiance of in-duct ultraviolet germicidal lamps

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

机构：[1]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, 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, Kowloon Tong, Tat Chee Ave, Hong Kong, Peoples R China;[4]Khalifa Univ, Dept Biomed Engn, Abu Dhabi, U Arab Emirates

年份：2019

卷号：152

起止页码：160

外文期刊名：BUILDING AND ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000459776900013)、、EI(收录号：20190806524948)、Scopus(收录号：2-s2.0-85061630244)、WOS

基金：The research presented in this paper was partially supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China [CityU 11273116], the program for scientific research start-up funds of Guangdong Ocean University and the Natural Science Foundation China [project number 51378447].

语种：英文

外文关键词：In-duct UVC; Irradiance; View factor; Diffuse reflection; Disinfection bioaerosols; IAQ

外文摘要：An ultraviolet (UV) germicidal lamp installed in a ventilation duct (in-duct) is one of the most effective means for disinfecting pathogens circulated inside ventilation duct. We presented a new mathematical model based on the view factor approach, which was first developed to calculate the irradiance (I-r) of a typical in-duct UV lamp consisting of short and double luminous tubes within a full-scale ventilation duct system. The model predicted both of the emissive irradiance (I-re) of in-duct UV lamp and the diffuse reflection from the ventilation duct wall. Validation experiments were conducted by measuring I-re for 1/4, 1/2 and full UV lamp luminous length in a full-scale ventilation system. The efficacy (eta) of the in-duct 1/2 luminous length UV lamp in disinfecting Escherichia coli (E. coli) was also experimentally and numerically studied. The results showed that the predicted I-re matched the measurement data well. The irradiance decreased accordingly as the luminous length of the UV lamp shrank. The disinfection efficacy declined as the air supply velocity increased and the highest measured eta was 67.1% for a 1/2 luminous length in-duct UV lamp on E. coli, with 3 m/s air supply velocity. The results suggested that in-duct UV lamp is an efficient way to inactivate the airborne E. coli. The developed model facilitates the prediction of the irradiance including the diffuse reflection and can prompt the application for in-duct UV disinfection systems.