Predicting airborne coronavirus inactivation by far-UVC in populated rooms using a high-fidelity coupled radiation-CFD model.
Predicting airborne coronavirus inactivation by far-UVC in populated rooms using a high-fidelity coupled radiation-CFD model.
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DOI：
10.1038/s41598-020-76597-y
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发表时间：
2020-11-12
影响因子：
4.6
通讯作者：
Atkinson KD
中科院分区：
文献类型：
--
作者：
Buchan AG;Yang L;Atkinson KD
在医院和长期护理设施中感染COVID-19的风险增加，特别是对弱势群体而言。在这些环境中，通过呼吸释放的雾化冠状病毒增加了传播疾病的机会。为了减少气溶胶传播，已经提出使用低剂量远紫外线照明来消毒室内空气。与几十年来一直用于杀死微生物但具有致癌性和致白内障性的典型UVC不同，最近的证据表明，远UVC在人类周围使用是安全的。一个高保真度，完全耦合的辐射传输和流体动力学模型已被开发，以量化消毒率在一个典型的通风房间。该模型表明，与单独使用房间通风相比，在目前推荐的暴露水平内使用远紫外线时，消毒率进一步提高了50-85%。有了这些减少的幅度，远紫外线照明可以在未来的波开始之前或感染风险较高的冬季开始之前减轻SARS-CoV-2的传播。这在通风不良的空间中尤其重要，因为其他减少措施不切实际，此外，社交距离可以减少而不会增加风险。
There are increased risks of contracting COVID-19 in hospitals and long-term care facilities, particularly for vulnerable groups. In these environments aerosolised coronavirus released through breathing increases the chance of spreading the disease. To reduce aerosol transmissions, the use of low dose far-UVC lighting to disinfect in-room air has been proposed. Unlike typical UVC, which has been used to kill microorganisms for decades but is carcinogenic and cataractogenic, recent evidence has shown that far-UVC is safe to use around humans. A high-fidelity, fully-coupled radiation transport and fluid dynamics model has been developed to quantify disinfection rates within a typical ventilated room. The model shows that disinfection rates are increased by a further 50-85% when using far-UVC within currently recommended exposure levels compared to the room’s ventilation alone. With these magnitudes of reduction, far-UVC lighting could be employed to mitigate SARS-CoV-2 transmission before the onset of future waves, or the start of winter when risks of infection are higher. This is particularly significant in poorly-ventilated spaces where other means of reduction are not practical, in addition social distancing can be reduced without increasing the risk.
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