Optimization of operating parameters of multi-lamp In-duct UVC air disinfection system through CFD analysis

Abstract

This research has focused on optimizing operating parameters of a multi-lamp In-duct UVC air disinfection system through Computational Fluid Dynamics (CFD) analysis. The efficacy of the system has highly dependent on proper system design to ensure both effective disinfection and minimal energy consumption. In this study five configurations with varying numbers of Ultraviolet-C (UVC) lamps (3, 6, 9, 11, 13) of wavelength 254nm has been investigated through CFD analysis.The velocity and irradiation profiles corresponding to different lamp configurations has been studied to optimize number of lamps. Further orientation profile has been explored at the original vertical position, 30-degree rotation, 60-degree rotation, and horizontal position to optimize position of lamps within duct. The 13 lamps arrangement yields maximum germicidal action has been evidenced from velocity and irradiation profiles. The orientation profiles has revealed that a uniform vertical arrangement of lamps offers best position for achieving the maximum UV dose. Standard deviation calculations for UV dose distribution across different orientation positions has confirmed that a vertical arrangement provide an uniform dose distribution. In comparision to earlier studies, optimized 13-lamp configuration has resulted in a more than 60% increase in average uv dose, superior dose uniformity, and higher germicidal efficacy than conventional configurations.