Che Wanqiao, Ding Junwei, Li Liang
School of Design, Central Academy of Fine Arts, Beijing, China.
School of Architecture, Southeast University, 2 Sipailou, Nanjing, Jiangsu, China.
Sustain Cities Soc. 2022 Feb;77:103548. doi: 10.1016/j.scs.2021.103548. Epub 2021 Nov 18.
Since the Corona Virus Disease 2019 (COVID-19) outbreak, the normalization of the epidemic has posed great challenge to epidemic prevention and control in indoor environment. Ventilation systems are commonly used to prevent and control indoor transmission of disease. However, most naturally ventilated rooms are not efficient to prevent the spread of virus, i.e., classrooms. The goal of this work is to effectively adopt forced interference strategies (e.g., airflow deflector) applied to external windows to strengthen airflow diffusion performance (ADP) of natural ventilation. So far, no systematic study has been done to investigate the effectiveness of such airflow deflectors on its influence on natural ventilation and effectiveness of preventing the disease transmission in indoor environment. In this work, a case study was conducted based on cross-ventilated classrooms. Different settings of airflow deflectors (i.e., size and installation angle) were applied to the external windows. Air Diffusion Performance Index (ADPI) was utilized to evaluated airflow diffusion performance under different settings of the airflow deflectors. Then, the Wells-Riley model was applied to evaluate infection risk. According to the results, the infection risk can be reduced by 19.29% when infection source is located at the center of classroom and 17.47% when source is located near the side walls. This work would provide guidance for the design of classrooms ventilated with induced natural wind for epidemic prevention and control.
自2019年冠状病毒病（COVID-19）爆发以来，疫情常态化对室内环境的疫情防控提出了巨大挑战。通风系统常用于预防和控制疾病的室内传播。然而，大多数自然通风的房间，如教室，在预防病毒传播方面效率不高。这项工作的目标是有效地采用应用于外窗的强制干扰策略（如气流导流板），以增强自然通风的气流扩散性能（ADP）。到目前为止，尚未进行系统研究来调查这种气流导流板对自然通风的影响以及在室内环境中预防疾病传播的有效性。在这项工作中，基于交叉通风的教室进行了案例研究。将不同设置（即尺寸和安装角度）的气流导流板应用于外窗。利用空气扩散性能指标（ADPI）评估气流导流板不同设置下的气流扩散性能。然后，应用威尔斯-莱利模型评估感染风险。结果显示，当感染源位于教室中心时，感染风险可降低19.29%，当感染源位于侧壁附近时，感染风险可降低17.47%。这项工作将为采用诱导自然风通风的教室设计提供疫情防控指导。
