标题：Assessing the Filtration Effectiveness of a PortableUltraviolet Air Cleaner on Airborne SARS-CoV-2Laden Droplets in a Patient Room: A NumericalStudy
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：It has been confirmed that SARS-CoV-2 can infect humans via airborne transmission fromperson to person. Accordingly, there are two concerns about the exhaled airborne SARS-CoV-2aerosol emitted from the coughs or sneezes of COVID-19 patients: (1) It might infect healthcareproviders in the same confined patient rooms; (2) It might enter the main ventilation system andtransmit to other patient room as a health threat. Therefore, a portable ultraviolet (UV) aircleaner is designed to mitigate the exposure risks to SARS-CoV-2 laden droplets in the patientroom. Using the experimentally validated computational fluid-particle dynamics (CFPD) model,this study simulated the airborne transmission, deposition, and clearance of the COVID-19 virusladen droplets emitted from a virtual patient in a virtual patient room with realistic ventilationconditions and various operating conditions of the portable UV air cleaner. Parameter analysiswas performed to investigate how the ventilation conditions and the operation conditions of thesanitizer can influence the effectiveness of the filtration, which are quantified by the reductionof the concentration of virus-laden droplets suspended in the room and escaped from the roominto the main ventilation system. Results indicate that the air cleaner is effective in virus-ladendroplets clearance if placed in appropriate locations. In addition, maximizing the ventilation flowrate of the air cleaner will provide the best mitigation effect, with the highest filtration efficiency.
关键词：COVID-19;Patient room;Portable UV air cleaner;Computational fluid-particle dynamics(CFPD);Cough droplets
