강의실 CO 2 발생률과 자연환기 특성의 측정 및 CFD 분석

• Published in: 한국안전학회지 Vol. 36; no. 1; pp. 86 - 94
• Main Authors: 이동해, Donghae Lee, 최영보, Youngbo Choi
• Format: Journal Article
• Language: Korean
• Published: 한국안전학회 28.02.2021
• Subjects: carbon dioxide; computational fluid dynamics; individual CO 2</ sub> release rate; lecture room; natural ventilation; carbon dioxide; natural ventilation; lecture room; computational fluid dynamics; individual $CO_2$ release rate
• ISSN: 1738-3803; 2383-9953

Lecture rooms are crowded with many attendees. Moreover, they rely significantly on the natural ventilation through windows for removing and controlling indoor contaminants such as CO 2 . With the aim of broadening the understanding of the characteristics of natural ventilation phenomena in lecture rooms, the average individual CO 2 release rates of attendees were measured during the course of a lecture and compared with previously reported CO 2 release rates. In addition, the effects of natural ventilation through windows on the time-variant CO 2 concentrations in the center of the lecture room were measured and analyzed. Moreover, details about the overall and regional CO 2 concentrations, as well as the air flows in the lecture room, were simulated and analyzed with computational fluid dynamics software, Fluent 2020 R2. It was found that the average individual CO 2 release rates were slightly slower than previously reported rates. The local CO 2 concentrations in the lecture room for regions with a high density of attendees increased over a short period of time, although the natural ventilation was already started by opening the windows. The overall CO 2 concentration in the lecture room rapidly decreased in the early stage of ventilation, but declined very slowly after a longer period of ventilation time. Therefore, in order to enhance the efficiency of a lecture room’s natural ventilation, it is recommended to homogeneously distribute the attendees in the lecture room, and to frequently open the windows for short periods of time.