A review on indoor airborne transmission of COVID-19– modelling and mitigation approaches

Rayegan, Saeed; Berquist, Justin; Jeon, Jisoo; Zhou, Liang; Wang, Liangzhu; Mbareche, Hamza; Tardif, Patrique; Ge, Hua

doi:10.1016/j.jobe.2022.105599

Cited by 24 publications

(9 citation statements)

References 204 publications

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“…Specifically, stakeholders, health organisations and the scientific community started questioning the current ventilation standards, suggesting that augmenting the outdoor air flow rates could be helpful not only for reducing the Covid-19 contagion risk but also in decreasing the risk of future pandemic and improving the overall safety of our living environment [ 15 , 16 ]. Therefore, even if the Covid-19 pandemic is coming to an end, the attention raised on the role of mechanical and natural ventilation in buildings seems to be at a new beginning [ 17 ], and the scientific community appears to agree on the need of overcoming the existing standards, enhancing the ventilation flow rates currently adopted [ 18 ]. In this framework, to identify the latest development of this topic in the scientific community, a comprehensive analysis of the works investigating the connection between Covid-19 infection risk in enclosed spaces and outdoor air ventilation flow rates is conducted.…”

Section: Introductionmentioning

confidence: 99%

New ventilation design criteria for energy sustainability and indoor air quality in a post Covid-19 scenario

Buonomano

Forzano

Giuzio

et al. 2023

Renewable and Sustainable Energy Reviews

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Section: Introductionmentioning

confidence: 99%

New ventilation design criteria for energy sustainability and indoor air quality in a post Covid-19 scenario

Buonomano

Forzano

Giuzio

et al. 2023

Renewable and Sustainable Energy Reviews

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“…In this respect, researchers have examined effective preventative measures of various systems, including individual ventilation [8] and air purifiers [9]. There is abundant research on the effectiveness of air purifiers demonstrating that their use is quite cheap compared to replacing an HVAC system and that numerous portable purifiers can be used in one area [10]. These devices can dramatically lower particle concentrations in a room, at direct or indirect exposure.…”

Section: Introductionmentioning

confidence: 99%

Local control of near-field diffusion of infected respiratory cloud in a room by air-blades

Rasam,

Gentile,

Simonetti

et al. 2023

J. Phys.: Conf. Ser.

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The respiratory cloud of an infective subject contains droplets of mucosalivary fluid carrying pathogens. As this cloud spreads at a certain distance from the emission point, the droplets accumulate and their volume concentration increases in the room unless dilution, adequate ventilation, or filtration reduce it. A susceptible subject, standing a short distance away can be exposed more easily to the infected respiratory cloud, thus inhaling a higher dose of pathogens than someone breathing the mixed air in the room. A local airflow pattern can be employed to reduce this short-distance risk of inhalation and potential contagion. We present experimental and numerical investigations of a novel device acting as a barrier to airborne pathogen diffusion at a short distance. This portable device generates V-shaped air blades in front of the subjects, shifting the respiratory clouds. The air blades are generated by 12 small fans, three on each side of the cube. The air is sucked into the small plenum inside the device body through the bases. By being positioned obliquely on a meeting table, the device acts as a direct barrier to virus-laden aerosols without any filtration. The experimental tests show that the system can reduce the local concentration of aerosol by 63 to 84% at the respiratory position of a subject sitting at a table in front of an infective person. CFD simulation outputs using the Multiphase Eulerian-Lagrangian model show a good agreement with the experimental results. The validated model will be used to extend the range of investigation to different settings and to perform a parametrical analysis of the main design conditions.

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“…Noorimotlagh et al (2021) have carefully reviewed various aspects related to disinfection methods, virus survival, control, and prevention strategies. Rayegan et al (2022) presented an exhaustive review on the modeling indoor airborne transmission of COVID-19 along with mitigation strategies. They state different strategies for various indoor environments but highlight the lack of work on reducing airborne transmission.…”

Section: Introductionmentioning

confidence: 99%

“…Rayegan et al. (2022) presented an exhaustive review on the modeling indoor airborne transmission of COVID‐19 along with mitigation strategies. They state different strategies for various indoor environments but highlight the lack of work on reducing airborne transmission.…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of airborne virus transmission in an intensive care unit due to single and sequential coughing

et al. 2023

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The virus causing COVID‐19 has constantly been mutating into new variants. Some of them are more transmissive and resistant to antibiotics. The current research article aims to examine the airborne transmission of the virus expelled by coughing action in a typical intensive care unit. Both single and sequential coughing actions have been considered to get closer to practical scenarios. The objective is to assess the effectiveness of air change per hour (ACH) on the risk of infection to a healthcare person and how the air change rate influences the dispersion of droplets. Such a study is seldom reported and has significant relevance. A total of four cases were analyzed, of which two were of sequential cough. When the ACH is changed from 6 to 12, the average particle residence time is reduced by ∼7 s. It is found that the risk of infection in the case of sequential cough will be relatively low compared to a single cough if the outlet of the indoor environment is placed above the patient's head. This arrangement also eliminates the requirement of higher ACH, which has significance from an energy conservation perspective.

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A review on indoor airborne transmission of COVID-19– modelling and mitigation approaches

Cited by 24 publications

References 204 publications

New ventilation design criteria for energy sustainability and indoor air quality in a post Covid-19 scenario

New ventilation design criteria for energy sustainability and indoor air quality in a post Covid-19 scenario

Local control of near-field diffusion of infected respiratory cloud in a room by air-blades

Risk assessment of airborne virus transmission in an intensive care unit due to single and sequential coughing

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