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2020 ; 740
(ä): 140113
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Determination of the optimal penetration factor for evaluating the invasion
process of aerosols from a confined source space to an uncontaminated area
#MMPMID32559547
Wang W
; Yoneda M
Sci Total Environ
2020[Oct]; 740
(ä): 140113
PMID32559547
show ga
Due to the outbreak and spread of COVID-19, SARS-CoV-2 has been proven to survive
in aerosols for hours. Virus-containing aerosols may intrude into an
uncontaminated area from a confined source space under certain ventilated
conditions. The penetration factor, which is the most direct parameter for
evaluating the invasion process, can effectively reflect the penetration fraction
of aerosols and the shielding efficiency of buildings. Based on the observed
concentrations of aerosols combined with a widely used concentration model, four
numerical calculations of the penetration factor are proposed in this study. A
theoretical time-correction P(est) was applied to a size-dependent P(avg) by
proposing a correction coefficient r, and the error analysis of the real-time
P(t) and the derived P(d) were also performed. The results indicated that P(avg)
supplied the most stable values for laboratory penetration simulations. However,
the time-correction is of little significance under current experimental
conditions. P(t) and P(d) are suitable for rough evaluation under certain
conditions due to the inevitability of particles detaching and re-entering after
capture. The proposed optimal penetration factor and the error analysis of each
method in this study can provide insight into the penetration mechanism, and also
provide a rapid and accurate assessment method for preventing and controlling the
spread of the epidemic.