循环和每小时的空气变化对室内COVID-19传播的影响:一项CFD研究,使用不同的HVAC参数
Md Tariqul Islam1, Yijie Chen2, Dahae Seong3
1School of Industrial Engineering, Purdue University, West Lafayette, IN, USA.
Heliyon
|August 22, 2024
概括
计算流体动力学建模显示,加热,通风和空调 (HVAC) 系统中每小时增加的空气变化 (ACH) 可以显著降低空气中的颗粒吸入风险,高达70%. 优化HVAC系统是室内感染控制的关键.
科学领域:
- 环境科学 环境科学
- 公共卫生 公共卫生
- 工程 工程师 工程师 工程师
背景情况:
- COVID-19的传播受到来自呼吸道液滴的空气中微粒的严重影响.
- 供暖,通风和空调 (HVAC) 系统在管理室内空气质量和感染风险方面发挥着至关重要的作用.
- 了解室内环境中的滴水和气溶动态对于公共卫生战略至关重要.
研究的目的:
- 通过计算流体动力学 (CFD) 来研究各种HVAC参数对呼气滴和气溶的分布和动态的影响.
- 量化与HVAC系统配置变化相关的颗粒吸入风险的降低.
- 评估CFD建模的可行性和有用性,以分析在狭窄空间中的空中传播.
主要方法:
- 利用计算流体动力学 (CFD) 建模来模拟呼出的滴和气溶的行为.
- 在不同的HVAC操作设置下分析了粒子的空间和时间分布.
- 研究了诸如每小时空气变化 (ACH) 和空气再循环率等参数的影响.
主要成果:
- 每小时增加空气变化 (ACH) 从2到8显著降低了约70%的颗粒吸入风险.
- 减少空气循环或增加新鲜空气供应有效降低了室内空气中的微粒度.
- 在可视化滴滴和气溶动态和评估传播风险方面,CFD建模被证明是有效的.
结论:
- 高温空调系统的优化,特别是增加 ACH 和新鲜空气的摄入量,是减轻 SARS-CoV-2 等呼吸道病原体在空气中传播的可行策略.
- CFD建模为评估和增强室内环境对空气传播感染的抵抗力提供了一个强大的工具.
- 这些发现为制定基于证据的建议提供了基础,以改善各种公共室内环境的通风.
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