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Analysis on the risk of respiratory virus transmission by air conditioning system operation based on experimental evidence.
Jia, Yonghong; Xiang, Yue; Guo, Shurui; Guo, Lei; Guo, Luyao; Cheng, Zhu; Zhang, Yin; Zhang, Li; Long, Enshen.
  • Jia Y; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China.
  • Xiang Y; Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, China.
  • Guo S; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China.
  • Guo L; Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, China.
  • Guo L; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China.
  • Cheng Z; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China.
  • Zhang Y; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China.
  • Zhang L; Department of Solid Waste Treatment Technology, Sichuan Environmental Protection Key Laboratory of Pollution Control for Heavy Metals, Sichuan Academy of Environmental Sciences, Chengdu, China.
  • Long E; MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu, China. longes2@163.com.
Environ Sci Pollut Res Int ; 28(40): 56376-56391, 2021 Oct.
Article in English | MEDLINE | ID: covidwho-1384555
ABSTRACT
It is important to know whether SARS-CoV-2 is spread through the air conditioning systems. Taking the central air conditioning system as an example, we analyze the mechanism and potential health risk of respiratory virus transmission in air-conditioned rooms and propose a method to study the risk of virus transmission in central air conditioning systems by investigating the data from medical experiments. The virus carrying capacity and the decay characteristics of indoor pathogen droplets are studied in this research. Additionally, the effects of air temperature and relative humidity on the virus survival in the air or on surfaces are investigated. The removal efficiency of infectious droplet nuclei by using an air conditioning filter was then determined. Thus, the transmission risk during the operation of the centralized air conditioning system is evaluated. The results show that the indoor temperature and humidity are controlled in the range of 20-25 °C and 40-70% by central air conditioning during the epidemic period, which not only benefits the health and comfort of residents, but also weakens the vitality of the virus. The larger the droplet size, the longer the viruses survive. Since the filter efficiency of the air conditioning filter increases with the increase in particle size, increasing the number of air changes of the circulating air volume can accelerate the removal of potential pathogen particles. Therefore, scientific operation of centralized air conditioning systems during the epidemic period has more advantages than disadvantages.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Viruses / Air Pollution, Indoor / Air Conditioning / COVID-19 Type of study: Experimental Studies / Prognostic study Limits: Humans Language: English Journal: Environ Sci Pollut Res Int Journal subject: Environmental Health / Toxicology Year: 2021 Document Type: Article Affiliation country: S11356-021-14495-0

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Viruses / Air Pollution, Indoor / Air Conditioning / COVID-19 Type of study: Experimental Studies / Prognostic study Limits: Humans Language: English Journal: Environ Sci Pollut Res Int Journal subject: Environmental Health / Toxicology Year: 2021 Document Type: Article Affiliation country: S11356-021-14495-0