Numerical analysis of germicidal uv-c lamp air disinfection system

Abstract

In this study, four germicidal UV-C lamps that are in a 600x600 square duct are numerically investigated. Also an UV reactor design is investigated for high resistive microorganisms. Air flow in the duct has 3000 m3/h volumetric flow rate. Simulations are conducted with commercial computational fluid dynamics solver ANSYS-FLUENT. In square duct, Lamps has 75 W UV power and their electrical efficiency depends on UV radiation generation, lamp surface temperature, contact air humidity, lamp working hours, lamp surface pollution. The radiation intensity around the lamps in the channel is evaluated by the using discrete ordinates method depending on the location. After that, the air flow on the lamps are modelled and particle motion simulation is carried out with the DPM model. The amount of UV dose received by these particles is calculated at the duct outlet, and the inactivation ratio for the general coronavirus family is examined. As a result, D90 inactivation performance is achieved in the system. The radiation distributions obtained depending on the UV power and the dose map in the duct outlet section depending on UV power are parametrically examined and presented.