Simulation Studies Provide Evidence of Aerosol Transmission of SARS-CoV-2 in a Multi-Story Building via Air Supply, Exhaust and Sanitary Pipelines

作者：Zhuona Zhang, Xia Li, Qin Wang, Xiaoning Zhao, Jin Xu, Qinqin Jiang, Sili Jiang, Jiayun Lyu, Shiqiang Liu, Ling Ye, Jun Yuan, Wenru Feng, Jiamin Xie, Qiuling Chen, Haoming Zou, Dongqun Xu · 发表于：International Journal of Environmental Research and Public Health · 年份：2022 · DOI：10.3390/ijerph19031532 · 被引用次数：10 · 研究领域：Infection Control and Ventilation、Building Energy and Comfort Optimization、COVID-19 and healthcare impacts

A cross-layer non-vertical transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) occurred in a quarantine hotel in Guangzhou, Guangdong Province, China in June 2021. To explore the cross-layer transmission path and influencing factors of viral aerosol, we set up different scenarios to carry out simulation experiments. The results showed that the air in the polluted room can enter the corridor by opening the door to take food and move out the garbage, then mix with the fresh air taken from the outside as part of the air supply of the central air conditioning system and re-enter into different rooms on the same floor leading to the same-layer transmission. In addition, flushing the toilet after defecation and urination will produce viral aerosol that pollutes rooms on different floors through the exhaust system and the vertical drainage pipe in the bathroom, resulting in cross-layer vertical transmission, also aggravating the transmission in different rooms on the same floor after mixing with the air of the room and entering the corridor to become part of the air supply, and meanwhile, continuing to increase the cross-layer transmission through the vertical drainage pipe. Therefore, the air conditioning and ventilation system of the quarantine hotel should be operated in full fresh air mode and close the return air; the exhaust volume of the bathroom should be greater than the fresh air volume. The exhaust pipe of the bathroom should be independently set ...