在ICU中对冲喷气通风的数值调查:热分层是一个问题吗?
Lei Wang1,2, Zhiqiang Wang3, Sirui Zhu3
1Institute of Refrigeration and Cryogenics/Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Zhejiang University, Hangzhou, China.
Building simulation
|June 26, 2023
概括
在重症监护室 (ICU) 中阻断喷气通风 (IJV) 可以通过控制空气流来降低感染风险. 较高的空气变化率和热源有助于稀释污染物,提高患者的安全.
科学领域:
- 环境工程 环境工程
- 流体动力学 流体动力学
- 医疗设施设计 医疗设施设计
背景情况:
- 重症监护室 (ICU) 是医院感染的高风险环境.
- 阻塞喷气通风 (IJV) 是改善ICU空气质量的有希望的技术.
- 热分层显著影响通风空间中的污染物分布.
研究的目的:
- 为了研究热分层对污染物分布的影响,在ICU中使用IJV.
- 分析空气流动力学中热浮力和惯性力之间的相互作用.
- 为优化医疗保健机构IJV设计提供指导.
主要方法:
- 在不同的空气变速 (2-12 ACH) 和热源设置下,系统地调查热分层和污染物分布.
- 使用无维浮力喷气长度尺度 () 的空气流驱动力的定量描述.
- 模拟和分析颗粒 (10-μm) 和气态污染物运输.
主要成果:
- 在较低的空气变化速率下,热浮力占主导地位,增加了呼吸区附近的暴露风险 (高达10μm颗粒的6.6‰).
- 设备 (例如PC监视器) 的热量流量增加可以通过促进上升运输来降低被占用区域中的气态污染物度.
- 较高的空气变换速率 (例如,8 ACH) 减少了热分层和直接污染物远离易受影响的个体,降低了颗粒吸收分数 (至0.8 ‰).
结论:
- IJV显示了在ICU中减轻感染传播的巨大潜力.
- 优化空气变化速率和管理热源对于IJV有效的污染物控制至关重要.
- 该研究为在重症监护环境中有效设计和实施IJV系统提供了理论基础.
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