Quantitative Analysis of CO2 Reduction by Door-opening in the Subway Cabin

출입문 개폐에 의한 전동차 객실 CO2 저감효과 분석

  • Kwon, Soon-Bark (Environment and Fire Control Research Team, Korea Railroad Research Institute) ;
  • Cho, Young-Min (Environment and Fire Control Research Team, Korea Railroad Research Institute) ;
  • Park, Duck-Shin (Environment and Fire Control Research Team, Korea Railroad Research Institute) ;
  • Park, Eun-Young (Department of Future Modern Traffic System Engineering, Korea University of Science and Technology)
  • 권순박 (한국철도기술연구원 환경화재연구팀) ;
  • 조영민 (한국철도기술연구원 환경화재연구팀) ;
  • 박덕신 (한국철도기술연구원 환경화재연구팀) ;
  • 박은영 (과학기술연합대학원대학교 미래첨단교통시스템공학부)
  • Published : 2008.04.30


The guidelines for indoor air quality of public transportations such as subway, train and bus was presented by Korean Ministry of Environment last end of year 2006 based on the great consequence of indoor air quality in daily life. Two main parameters, carbon dioxide($CO_2$) and particulate matters smaller than $10\;{\mu}m(PM_{10})$, were selected as index pollutants for the management of indoor air quality. The former pollutant, $CO_2$, is regarded as index of ventilation status and the major source of $CO_2$ in the train or subway is the exhalation of passengers. It is publically perceived that the high $CO_2$ concentration in a crowded subway will be reduced and ventilated with outdoor air by door-opening taken every 2 or 3 minutes when the train stops each station. However, there has not been any scientific proof and quantitative information on the effect of door-opening on the $CO_2$ reduction by ventilation with outdoor air. In this study, $CO_2$ concentration and number of passengers were measured at each station on the 3 lines of Korail metropolitan subway. In order to evaluate the effect of $CO_2$ reduction by door opening, the theoretical approach using the $CO_2$ balance equation was performed. By comparing the predicted data with monitoring one, the optimum $CO_2$ dilution factor was determined. For the first time, it was quantified that about 35% of $CO_2$ concentration in the subway indoor was removed by the door-opening at each station.


Subway$CO_2$ dilution factor;Door-opening;Indoor air quality


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