A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development and experimental validation of a mathematical model for the irradiance of in-duct ultraviolet germicidal lamps
Abstract 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 (η) 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 η 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.
Graphical abstract Display Omitted
Highlights A mathematical model is developed for modeling the irradiance of in-duct UVGI lamp. The diffuse reflection and length of the tube are considered in the model. The model prediction agrees well with experimental results. Disinfection performance of UV lamps on Escherichia coli is high. In-duct UVGI is a potential solution for improving IAQ.
Development and experimental validation of a mathematical model for the irradiance of in-duct ultraviolet germicidal lamps
Abstract 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 (η) 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 η 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.
Graphical abstract Display Omitted
Highlights A mathematical model is developed for modeling the irradiance of in-duct UVGI lamp. The diffuse reflection and length of the tube are considered in the model. The model prediction agrees well with experimental results. Disinfection performance of UV lamps on Escherichia coli is high. In-duct UVGI is a potential solution for improving IAQ.
Development and experimental validation of a mathematical model for the irradiance of in-duct ultraviolet germicidal lamps
Yang, Yi (author) / Zhang, Huihui (author) / Chan, Vincent (author) / Lai, Alvin CK. (author)
Building and Environment ; 152 ; 160-171
2019-02-03
12 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2019
In-Place Testing of In-Duct Ultraviolet Germicidal Irradiation
| Taylor & Francis Verlag | 2009