The effect of door opening on air-mixing in a positively pressurized room: Implications for operating room air management during the COVID outbreak
The effect of door opening on air-mixing in a positively pressurized room: Implications for operating room air management during the COVID outbreak
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DOI：
10.1016/j.jobe.2021.102900
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发表时间：
2021-06-19
影响因子：
6.4
通讯作者：
Mousavi E
中科院分区：
文献类型：
--
作者：
Bhattacharya A;Ghahramani A;Mousavi E
建筑环境对主要室内气流模式的影响是显著的。为了保护一线医护人员免受COVID - 19疫情的影响，有必要了解病毒的传播动态，这已被证明取决于室内气流模式。在医院手术室（ORs），设计要求提出了独特的挑战，因为如果新冠病毒阳性患者需要手术治疗，手术室的正压可能会促进病毒传播到邻近的空间。此外，门运动产生的湍流涡可以单独增加病毒从手术室逃逸到邻近走廊的概率。因此，为了获得正压室中门运动引起的流场变化的关键知识，并量化门上的空气混合，在受控室中进行了一系列实验。结果表明，门开度对气流形态有显著影响。门附近的变化增加，以及多扇门打开时涡流深入室内，都需要进一步研究门运动下的室内气流动力学。本实验研究提出了一种算法来量化由于标准门打开而产生的空气交换，并量化每小时换2次空气的污染空气的泄漏，即室供应气流率的10%。量化耗散空气量的算法以及初始条件与门开度之间相互作用的分析是本文的独创性之处。
The effect of the built environment on the predominant indoor airflow patterns is significant. To protect the healthcare workers at the front line from the outbreak of COVID − 19, it is necessary to understand the transmission dynamics of the virus, which has been shown to depend on indoor airflow patterns. In hospital operating rooms (ORs), design requirements pose a unique challenge as the positive pressure in the OR can facilitate virus spread into adjacent spaces, shall a COVID-positive patient require a surgical procedure. Moreover, the turbulent vortexes from door motions could independently increase the probability of virus escape from the OR to the adjacent corridors. Therefore, to obtain critical knowledge about the alteration of flow fields due to door movement in a positively pressurized room and quantify the air mixing across the door, a series of experiments were conducted in a controlled chamber. The results demonstrate significant impacts of the door opening on the airflow patterns. Increased alterations near the door and vortexes penetrating far into the chamber with multiple doors openings warrant further study of the indoor airflow dynamic under door motion. This experimental study proposes an algorithm to quantify the air exchange due to a standard door opening and quantifies this exfiltration of contaminated air up to 2 air changes per hour, that is 10% of the chamber supply airflow rate. The algorithm to quantify the dissipated air quantity and the analyses of interaction between initial conditions and door openings contribute to the originality of this paper.
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