Journal
INDOOR AIR
Volume 23, Issue 2, Pages 162-171Publisher
WILEY-BLACKWELL
DOI: 10.1111/ina.12005
Keywords
Airborne transmission; Personalized ventilation; Mixing ventilation; Displacement ventilation; Inhaled air quality; Upward airflow
Categories
Funding
- Research Grant Committee of the Hong Kong SAR government (RGC) [PolyU5265/08E]
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Personalized ventilation (PV) system in conjunction with total ventilation system can provide cleaner inhaled air for the user. Concerns still exist about whether the normally protecting PV device, on the other hand, facilitates the dispersion of infectious agents generated by its user. In this article, two types of PV systems with upward supplied fresh air, namely a chair-based PV and one kind of desk-mounted PV systems, when combined with mixing ventilation (MV) and displacement ventilation (DV) systems, are investigated using simulation method with regard to their impacts on co-occupant's exposure to the exhaled droplet nuclei generated by the infected PV user. Simulation results of tracer gas and particles with aerodynamic diameter of 1, 5, and 10m from exhaled air show that, when only the infected person uses a PV, the different PV air supplying directions present very different impacts on the co-occupant's intake under DV, while no apparent differences can be observed under MV. The findings demonstrate that better inhaled air quality can always be achieved under DV when the adopted PV system can deliver conditioned fresh air in the same direction with the mainly upward airflow patterns of DV.
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