Yi Yang
ABSTRACT
Upper-room ultraviolet germicidal (UR-UVGI) fixture has been recommended as one of choices for preventing the transmission of the airborne pathogens in poor ventilated room. To theoretically predict the irradiance of multiple UR-UVGI fixtures is key importance for the practical evaluation of their disinfection efficiencies. In this study, a mathematical model based on the view factor approach from radiative heat transfer was developed to predict the irradiance of multiple UR-UVGI fixtures. In the model, the reflector and tedious fixture were simplified as a fictitious surface and the shading effect of the louvers was considered. The model was validated by the literature experiment case. It should be instrumental for the design of the UR-UVGI disinfection system.
- Yang, Y., Chan, W.Y., Wu, C.L., Kong, R.Y.C., Lai, A.C.K., 2012. Minimizing the exposure of airborne pathogens by upper-room ultraviolet germicidal irradiation: an experimental and numerical study. J. R. Soc. Interface, 9 (Dec. 2012), 3184--3195Google Scholar
- Yang, Y., Lai, A.C.K., and Wu, C., 2016. Study on the disinfection efficiency of multiple upper-room ultraviolet germicidal fixtures system on airborne microorganisms. Build. Environ. 103 (Jul. 2016), 99--110.Google ScholarCross Ref
- CDC, 2005. Guidelines for preventing the transmission of Mycobacterium tuberculosis in health-care settings. Centers for Diseases Control and Prevention, Morbidity and Mortality Weekly Report, CDC, MMWR2005; 54 (No.RR-17), 1--141.Google Scholar
- Xu, P., Kujundzic, E., Peccia, J., Schafer, M.P., Moss, G., Hernandez, M., Miller, S.L., 2005. Impact of environmental factors on efficacy of upper-room air ultraviolet germicidal irradiation for inactivating airborne mycobacteria. Environ. Sci. Technol. 39 (Dec. 2005), 9656--9664Google ScholarCross Ref
- Walker, CM, Ko, G., 2007. Effect of ultraviolet germicidal irradiation on viral aerosols. Environ. Sci. Technol. 41 (Aug. 2007), 5460--5465Google ScholarCross Ref
- Xu, P., Peccia, J., Fabian, P., Martyny, J.W., Fennelly, K.P., Hernandez, M., Miller, S.L., 2003. Efficacy of ultraviolet germicidal irradiation of upper-room air in inactivating airborne bacterial spores and mycobacteria in full-scale studies. Atmos. Environ. 37 (Jan. 2003), 405--419.Google ScholarCross Ref
- Wu, C.L., Yang, Y., Wong, S.L., and Lai, A.C.K., 2011. A new mathematical model for irradiance field prediction of upper-room ultraviolet germicidal systems. J. Hazard. Mater. 189 (May 2011), 173--185Google ScholarCross Ref
- Rudnick, S.N., First, M.W., Sears T., Vincent, R.L., Brickner, P.W., Ngai, P.Y., Zhang, J., Levin, R.E., Chin, K., Rahn, R.O., Miller S.L., Nardell, E.A., 2012. Spatial distribution of fluence rate from upper-room ultraviolet germicidal irradiation: Experimental validation of a computer-aided design tool. HVAC&R Res. 18(4) (2012), 774--794.Google Scholar
- Gilkeson, C.A., Noakes, C.J., 2013. Application of CFD simulation to predicting upper-room UVGI effectiveness. Photochem. Photobiol. 89 (Jul. 2013), 799--810Google Scholar
- Rudnick, S.N., McDevitt, J.J., Hunt, G.M., Stawnychy, M.T., Vincent, R.L., and Brickner, P.W., 2015. Influence of ceiling fan's speed and direction on efficacy of upperroom, ultraviolet germicidal irradiation: Experimental. Build. Environ. 92 (Oct. 2015), 756--763Google ScholarCross Ref
- Modest, M.F., 2013. Radiative Heat Transfer, third ed., Elsevier, Oxford, Chap. 1, Chap. 4.Google Scholar
Index Terms
- Mathematical Modeling the Irradiance of Multiple Upper-Room Ultraviolet Germicidal Fixtures for Airborne Pathogens Disinfection
Recommendations
Efficient irradiance normal mapping
I3D '10: Proceedings of the 2010 ACM SIGGRAPH symposium on Interactive 3D Graphics and GamesIrradiance normal mapping is a method to combine two popular techniques, light mapping and normal mapping, and is used in games such as Half-Life 2 or Halo 3. This combination allows using low-resolution light caching on surfaces with only a few ...
An efficient representation for irradiance environment maps
SIGGRAPH '01: Proceedings of the 28th annual conference on Computer graphics and interactive techniquesWe consider the rendering of diffuse objects under distant illumination, as specified by an environment map. Using an analytic expression for the irradiance in terms of spherical harmonic coefficients of the lighting, we show that one needs to compute ...
Coarse irradiance estimation using curvilinear skeleton
SIGGRAPH '12: ACM SIGGRAPH 2012 PostersLight flux can take complex paths to reach the observer, especially in large and sophisticated scenes. In such situations, global illumination algorithms are used: irradiance caching, path tracing and radiosity allow to precisely compute the irradiance ...
Comments