UV-C Light Simulation for Room Disinfection System

This project focused on generating different layouts of hospital room models using DIALUX Evo 9.1 software and testing out different UV-C light arrangements in the room in achieving the utmost goal of this study which is to achieve optimal microorganism disinfection using UV-C.

Viruses are minuscule parasites. Predominantly viruses have gained notoriety for being the reason for disease. However, these harmful pathogens can be inactivated by using the surface disinfection method. Surface disinfection uses UV-C radiation that has a wavelength of 200 to 280 nm to disinfect the pathogens. Wavelengths of UV-C radiation are responsible for cell damage because the proteins, RNA and DNA, absorb the radiation. UV-C rays come from man-made products, such as UVC-LED lights that were used in this project. This project aimed to simulate the UV-C light intensity in different room layouts to guide the evaluation of the effectiveness of the disinfection system which consists of UVC-LED lights. Besides determining the quantity and the layout of the UV-C lights, the project also aimed to help visualize the coverage of light and pay attention to the under-exposed area for optimum disinfection. DIALUX Evo 9.1 was used to simulate the light intensity in different room and light layouts. As the software outputs the data in Lux unit, a correlation to convert Lux unit to UV-C dosage, in mJ/cm2, was first identified experimentally. There is no existing relationship relating Lux unit to UV-C dosage reported in the literature. A minimum UV-C dosage of 40 mJ/cm2 is required to achieve complete surface disinfection of microorganisms. The simulation was able to visualize the coverage of light and the optimum placement of UV-C lights to ensure the minimum UV-C dosage is delivered. The outcome of this project can help to guide the design of disinfection systems in hospital wards to achieve the complete surface disinfection of microorganisms.

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