Yin Yonggao, Gupta Jitendra K, Zhang Xiaosong, Liu Junjie, Chen Qingyan
School of Energy and Environment, Southeast University, Nanjing, China.
School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA.
Build Environ. 2011 Jan;46(1):75-81. doi: 10.1016/j.buildenv.2010.07.003. Epub 2010 Jul 13.
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 respiratory 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 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 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.
本研究调查了单人病房内污染物的传播情况，并评估了其通风性能。该研究在一个模拟单人病房的全尺寸舱室内，对患者呼出和咳出的呼吸道污染物分布进行了对比实验分析。在稳态条件下，用SF示踪气体和3μm颗粒模拟患者呼出的污染物。对于混合通风情况，咳嗽和呼吸情况下污染物分布的差异不显著；而对于置换通风，咳嗽情况下房间上部的污染物浓度更高。在相同送风气流率下，置换通风时患者坐在床上的情况下病房内的污染物浓度低于患者仰卧在床上的情况。以显著的初始速度释放的SF示踪气体和3μm颗粒用于模拟咳嗽，在病房内可产生相似的污染物分布。因此，实验数据可用于验证计算流体动力学（CFD）模型，而经过验证的CFD模型可用于研究瞬态咳嗽和呼吸过程。
