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Distributions of respiratory contaminants from a patient with different postures and exhaling modes in a single-bed inpatient room

机译:单人病房中不同姿势和呼气方式的患者呼吸污染物的分布

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This study investigated contaminant transport and evaluated the ventilation performance in a single-bed inpatient room. The study performed comparative experimental analysis on the distributions of respi-ratory contaminants breathed out and coughed out by a patient in a full-scale chamber, which simulated a single-bed inpatient room. The contaminant exhaled by the patient was simulated by an SF_6 tracer gas and 3-μm particles at steady-state conditions. The differences in the contaminant distribution between the coughing and breathing cases were insignificant for the mixing ventilation case, while for the displacement ventilation, the contaminant concentrations in the upper part of the room were higher for the coughing case. The contaminant concentrations in the inpatient room for the case with the patient sitting on the bed were lower than those for the patient supine on the bed for the displacement ventilation under the same supply airflow rate. The SF_6 tracer gas and 3-μm particles released at a notable initial velocity for simulating a cough could give similar contaminant distributions in the inpatient room. Therefore, the experimental data can be used to validate a CFD model, and the validated CFD model can be used to investigate transient coughing and breathing processes.
机译:这项研究调查了污染物的迁移并评估了单床住院室的通风性能。该研究进行了对比实验分析,以分析患者在一个全尺寸病房(模拟一个单人床病房)中呼出和咳嗽的呼吸污染物的分布。在稳态条件下,使用SF_6示踪气体和3-μm颗粒模拟了患者呼出的污染物。对于混合通风情况,咳嗽和呼吸情况之间的污染物分布差异不明显,而对于置换通风,咳嗽情况则是在房间上部的污染物浓度较高。在相同的送风量下,患者坐在床上的情况下住院室中的污染物浓度低于卧位躺在床上进行置换通气的患者中的污染物浓度。以明显的初始速度释放的SF_6示踪气体和3-μm颗粒可用于模拟咳嗽,可在住院室中产生类似的污染物分布。因此,实验数据可用于验证CFD模型,而经过验证的CFD模型可用于研究短暂咳嗽和呼吸过程。

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