An experimental study on airborne transmission in a meeting room with different air distribution methods

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-05-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
Series
Building and Environment, Volume 256
Abstract
Aerosols are one of the major sources of cross-infection. The main purpose of this study is to analyze the effects of heat gain, airflow rate, air distribution, and the location of an infector on the airborne transmission and infection probability in a meeting room. In a six-person meeting room the droplet nuclei of an infected person were simulated with tracer gas (SF6) generated by a thermal breathing manikin. An overhead perforated duct (OPD) and low velocity unit (LVU) were used and their performance was compared. With OPD, the average contaminant removal efficiency in the breathing zone was quite uniformly between 0.9 and 1.1. With LVU, the average contaminant removal efficiency varied greatly between 0.2 and 10.1. The airborne generation was assumed to be 5 quantum/h by an infected person. The infection probability for every exposed person was found to be quite uniform with OPD, 1.4 % with a heat gain and air flow rate of 38 W/m2 and 61 l/s and 0.9 % with a heat gain and air flow rate of 60 W/m2 and 116 l/s after 3 hours’ exposure. However, variation of the infection probability with LVU was significant and the highest risk reached 4 %. The infection probability was lower if the exposed person was farther from the infector, or in the case of OPD if the infector was near the exhaust. With LVU, the infection probability depended on the airflow rate and the relative distance between the supply unit and the exposed person.
Description
Publisher Copyright: © 2024 The Authors
Keywords
air distribution, Airborne transmission, Heat gain, Infection probability, Meeting room, Tracer gas
Other note
Citation
Zhao, W, Lestinen, S, Guo, M, Kilpeläinen, S, Jokisalo, J & Kosonen, R 2024, ' An experimental study on airborne transmission in a meeting room with different air distribution methods ', Building and Environment, vol. 256, 111522 . https://doi.org/10.1016/j.buildenv.2024.111522