Chen Chun, Zhao Bin, Lai Dayi, Liu Wei
1Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, N.T. 999077 Hong Kong, China.
2Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, 518057 China.
Build Simul. 2018;11(5):1039-1051. doi: 10.1007/s12273-018-0441-0. Epub 2018 Mar 17.
Many airborne infectious diseases can be transmitted via exhaled contaminants transported in the air. Direct exposure occurs when the exhaled jet from the infected person directly enters the breathing zone of the target person. Indirect exposure occurs when the contaminants disperse in the room and are inhaled by the target person. This paper presents a simple method for differentiating the direct and indirect exposure to exhaled contaminants in mechanically ventilated rooms. Experimental data for 191 cases were collected from the literature. After analyzing the data, a simple method was developed to differentiate direct and indirect exposure in mixing and displacement ventilated rooms. The proposed method correctly differentiated direct and indirect exposure for 120 out of the 133 mixing ventilation cases and 47 out of the 58 displacement ventilation cases. Therefore, the proposed method is suitable for use at the early design stage to quickly assess whether there will be direct exposure to exhaled contaminants in a mechanically ventilated room.
许多空气传播的传染病可通过空气中传播的呼出污染物进行传播。当感染者呼出的气流直接进入目标人员的呼吸区域时，就会发生直接暴露。当污染物在室内扩散并被目标人员吸入时，则会发生间接暴露。本文提出了一种简单的方法，用于区分机械通风房间中呼出污染物的直接暴露和间接暴露。从文献中收集了191个案例的实验数据。在对数据进行分析后，开发了一种简单的方法来区分混合通风和置换通风房间中的直接暴露和间接暴露。对于133个混合通风案例中的120个以及58个置换通风案例中的47个，所提出的方法正确地区分了直接暴露和间接暴露。因此，所提出的方法适用于在早期设计阶段使用，以快速评估在机械通风房间中是否会存在呼出污染物的直接暴露情况。
