Simulation Based Design of Deep Ultraviolet LED Array Module Used in Virus Disinfection

摘要

The deep Ultraviolet (UV) light with wavelength range of 240~280nm is well known as a light inactivation treatment with the damage of DNA and RNA of virus. Because of its compact size, tunable emission spectrum and mercury-free, UVC light-emitting diode (LED) has been considered as one of candidate light sources used in virus disinfection. A disinfection system always contains a UVC LED array module to ensure enough UV radiation power, however, a mass of produced heat will also require the good thermal management. To fulfill the disinfection effect and guarantee high reliability, this paper designs a UVC LED array module and assess its performances using both optical and thermal simulations. Firstly, the function of UV dose with the radiation power and radiation time is established for a commercial UVC LED package used as the light source in this paper. Then, the radiation performance of the designed 3*3 UVC LED array module is evaluated by the Monte-Carlo ray-tracing simulation using TracePro 7.0. Final, the thermal managements considering the natural convection, air cooling and water cooling are simulated and compared based on the Autodesk CFD simulation. The results show that: (1) the radiation power and radiation distance can determine the radiation power density, and radiation dose is decided by radiation power density and radiation time; (2) a powerful thermal management is necessary for UVC LED array module design because of its high thermal resistance, and the air cooling is an appropriate scheme with good performance and low cost.