Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Measurements and CFD Analysis for Release Rate of CO2 and Characteristics of Natural Ventilation in Lecture Room

강의실 CO2 발생률과 자연환기 특성의 측정 및 CFD 분석

  • Lee, Donghae (Department of Safety Engineering, Chungbuk National University) ;
  • Choi, Youngbo (Department of Safety Engineering, Chungbuk National University)
  • 이동해 (충북대학교 안전공학과) ;
  • 최영보 (충북대학교 안전공학과)
  • Received : 2020.12.22
  • Accepted : 2021.02.04
  • Published : 2021.02.28
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Abstract

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 CO2. With the aim of broadening the understanding of the characteristics of natural ventilation phenomena in lecture rooms, the average individual CO2 release rates of attendees were measured during the course of a lecture and compared with previously reported CO2 release rates. In addition, the effects of natural ventilation through windows on the time-variant CO2 concentrations in the center of the lecture room were measured and analyzed. Moreover, details about the overall and regional CO2 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 CO2 release rates were slightly slower than previously reported rates. The local CO2 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 CO2 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.

Keywords

Acknowledgement

This research was supported by Chungbuk National University(2019)

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