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Article

Application of Portable Air Purifiers for Mitigating COVID-19 in Large Public Spaces

1
Department of Civil, Environmental and Architectural Engineering, University of Colorado at Boulder, Boulder, CO 80309, USA
2
School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
3
Engineering & Facilities, Global Operations, Marriott International, Inc., Bethesda, MD 20817, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Nocera
Buildings 2021, 11(8), 329; https://doi.org/10.3390/buildings11080329
Received: 24 June 2021 / Revised: 18 July 2021 / Accepted: 26 July 2021 / Published: 29 July 2021
This study investigated, using validated computational fluid dynamics techniques, the actual performance of portable air purifiers for reducing the infection risks of airborne respiratory diseases such as COVID-19, by properly installing air purifiers in complicated large public spaces of primary concern, such as restaurants and ballrooms. The research results reveal that portable air purifiers with HEPA filtration provide an effective solution to help mitigate virus-carrying particles/droplets in large spaces where the central air conditioning system with HEPA filtration may not provide adequate dilution and/or effective ventilation. Deploying portable air purifier changes the local flow directions, and thus, reduces the cross-table airflows that may enhance the possibility of cross-infection. A field experiment was further conducted in a restaurant and a ballroom to verify the on-site performance. This study indicates that each space is unique in furniture, occupant and system layouts and capacities, and thus, requires individualized investigation of appropriate purifier number, capacities, and locations. Flexible solutions such as portable air purifiers are important and low-cost supplements to more elaborate solutions installed in central air systems. View Full-Text
Keywords: portable air purifier; computational fluid dynamics; field experiment; public space; COVID-19 portable air purifier; computational fluid dynamics; field experiment; public space; COVID-19
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MDPI and ACS Style

Zhai, Z.; Li, H.; Bahl, R.; Trace, K. Application of Portable Air Purifiers for Mitigating COVID-19 in Large Public Spaces. Buildings 2021, 11, 329. https://doi.org/10.3390/buildings11080329

AMA Style

Zhai Z, Li H, Bahl R, Trace K. Application of Portable Air Purifiers for Mitigating COVID-19 in Large Public Spaces. Buildings. 2021; 11(8):329. https://doi.org/10.3390/buildings11080329

Chicago/Turabian Style

Zhai, Zhiqiang, He Li, Robert Bahl, and Keith Trace. 2021. "Application of Portable Air Purifiers for Mitigating COVID-19 in Large Public Spaces" Buildings 11, no. 8: 329. https://doi.org/10.3390/buildings11080329

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