CFD analysis of the performance of a local exhaust ventilation system in a hospital ward
CFD analysis of the performance of a local exhaust ventilation system in a hospital ward
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DOI：
10.1177/1420326x06066123
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发表时间：
2006-06-01
影响因子：
3.6
通讯作者：
Leung, Michael K. H.
中科院分区：
文献类型：
--
作者：
Chau, Oliver K. Y.;Liu, Chun-Ho;Leung, Michael K. H.
医护人员(HCW)医院感染的风险很高，因为他们经常对感染患者进行可能产生生物气溶胶的医疗程序。例如，严重急性呼吸综合征(SARS)患者的紧急气管插管。由于接近感染源(如患者呼吸区)的生物气溶胶浓度很高，局部排气通风(LEV)已被确定为降低医院病房内生物气溶胶浓度的一种实用解决方案。在这项研究中，计算流体动力学(CFD)模型被用来模拟医院病房内传染性液滴和生物气溶胶的传输，以辅助LEV系统的设计和控制。本文详细介绍了CFD的数学模型，分析了液滴和生物气溶胶的大小、排放方向和排放速度的分布和悬浮时间。结果表明，设计合理的LEV系统可以有效地去除HCW呼吸区的感染性液滴和生物气溶胶。
Healthcare workers (HCWs) are at high risk of nosocomial infection as they frequently perform medical procedures on infectious patients that may generate bioaerosols. For example, emergency endotracheal intubations for severe acute respiratory syndrome (SARS) patients. Due to the high zonal bioaerosol concentration close to infection sources (e.g. patient's breathing zone) local exhaust ventilation (LEV) has been identified as a practical solution to reduce the bioaerosol concentration in hospital wards. In this study, computational fluid dynamic (CFD) models have been developed to simulate the transport of infectious droplets and bioaerosols in a hospital ward to aid the design and control of a LEV system. This paper reports the details of the CFD mathematical models as well as the analyses of the distribution and suspension time of droplets and bioaerosols with respect to their size, emission direction, and emission speed. It is shown that the operation of a well-designed LEV system can effectively remove infectious droplets and bioaerosols from the breathing zone of a HCW.