Ventilation indices for evaluation of airborne infection risk control performance of air distribution

Lu, Yalin; Niu, Dun; Zhang, Sheng; Chang, Han; Lin, Zhang

doi:10.1016/j.buildenv.2022.109440

Cited by 30 publications

(3 citation statements)

References 50 publications

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“…The U.S. EPA benchmark is ≦ 10 −4 infection cases per-person-per-year (pppy). According to the previous research [ 52 ], the calculation results and criteria can be expanded by a multiple of 10 3 to make the expression clearer, which has no impact on the judging of the indicators. Hence, 0.1 presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Lan

et al. 2023

Journal of Building Engineering

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Section: Resultsmentioning

confidence: 99%

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Lan

et al. 2023

Journal of Building Engineering

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“…The assumption of being well-mixing generally applies to the widely used ventilation method, i.e., mixing ventilation (Rudnick and Milton 2003;Liao et al 2005;Andrews et al 2013;Richardson et al 2014;Vouriot et al 2021), which has also been validated in Figure 4. When other advanced ventilation methods are used, e.g., displacement ventilation and stratum ventilation, ventilation efficiency should be introduced to revise the assumption of being well-mixing (Sun and Zhai 2020;Lu et al 2022b). Second, the working productivity is indicated by the accumulated occupancy merely.…”

Section: Limitationsmentioning

confidence: 99%

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

2022

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Ventilation is an important engineering measure to control the airborne infection risk of acute respiratory diseases, e.g., Corona Virus Disease 2019 (COVID-19). Occupancy-aided ventilation methods can effectively improve the airborne infection risk control performance with a sacrifice of decreasing working productivity because of the reduced occupancy. This study evaluates the effectiveness of two occupancy-aided ventilation methods, i.e., the continuously reduced occupancy method and the intermittently reduced occupancy method. The continuously reduced occupancy method is determined by the steady equation of the mass conservation law of the indoor contaminant, and the intermittently reduced occupancy method is determined by a genetic algorithm-based optimization. A two-scenarios-based evaluation framework is developed, i.e., one with targeted airborne infection risk control performance (indicated by the mean rebreathed fraction) and the other with targeted working productivity (indicated by the accumulated occupancy). The results show that the improvement in the airborne infection risk control performance linearly and quadratically increases with the reduction in the working productivity for the continuously reduced occupancy method and the intermittently reduced occupancy method respectively. At a given targeted airborne infection risk control performance, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the working productivity by up to 92%. At a given targeted working productivity, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the airborne infection risk control performance by up to 38%.

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“…El Covid-19, el teletrabajo y, de manera general, la extensión de horas de permanencia al interior del hogar (Red de Pobreza Energética, 2019) han dejado en manifiesto la precariedad en los modos de vida, estándares de habitabilidad y confort al interior de las viviendas en Chile (Guerra, 2020). Esta situación se agrava en familias más vulnerables de la zona centrosur del país cuyos hogares son de carácter social y no ofrecen las prestaciones de habitabilidad adecuada, presentando un ambiente intradomiciliario inseguro ante enfermedades que afectan el sistema respiratorio (Encinas, Truffello, Urquiza y Valdés, 2020) (Dai & Zhao, 2022) (Bi, Aganovic, Mathisen y Cao, 2022) (Lu, Niu, Zhang, Chang y Lin, 2022).…”

Section: Introductionunclassified

Impacto del confinamiento por Covid-19 en los niveles de concentración de CO2 al interior de la vivienda de tipo social en Chile

Guíñez-Viveros

Bobadilla-Moreno

Muñoz-Viveros

2022

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More than ever before, the COVID-19 crisis and the need to spend longer periods of time in our places of residence, have highlighted the need to improve indoor air quality (IAQ) and ventilation to reduce the risks of airborne virus transmission. Added to the need to progressively improve the energy performance of our buildings to achieve carbon neutrality is this completely contrary new requirement, which forces reconsidering the ventilation issue, its standards, and technological solutions to improve IAQ and limit the risks of contagion inside our homes, without losing sight of the goals that climate change imposes on us. Chile is seeking strategies to generate sustainable, energy-efficient, and comfortable housing, which must be reconsidered in light of Covid-19. Greater permanence inside the home revealed the precariousness of the lifestyles the most vulnerable families face; sometimes exposing them to environments that are risky for their health. The objective of this research was to estimate the impact of Covid-19 on CO2 indoor air concentrations, as a result of the intensity of use (occupation) of the home, considering envelopes with different levels of airtightness. Using an experimental methodology, based on simulations with the DesignBuilder software, the CO2 concentrations of four types of social housing, located in the commune of Coronel, Biobío, Chile, were quantified. The results showed that confinement increased CO2 levels by 16.4%, while the change from the original condition of the envelope to more airtight levels generated an increase of more than 83% in normal use and 97% for periods of confinement.

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Ventilation indices for evaluation of airborne infection risk control performance of air distribution

Cited by 30 publications

References 50 publications

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Investigation on the cross-infection control performance of interactive cascade ventilation in multi-scenario of winter

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

Impacto del confinamiento por Covid-19 en los niveles de concentración de CO2 al interior de la vivienda de tipo social en Chile

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