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Abstract

The increasing concerns regarding the management of indoor air quality have become an important issue for subway operators because most subway lines are underground and have poor ventilation. To maintain clean and fresh indoor air in cabins with low consumption of energy it is first necessary to quantify the components of the ventilation in the cabins divided into mechanical ventilation and natural ventilation. However, there is no established method of, nor reliable data on, how much indoor air is exchanged through natural ventilation such as doors opening and closing. In this study, carbon dioxide (CO₂) levels were measured in 6 lines of the Seoul Metropolitan Subways and a theoretical approach was made to estimate the indoor CO₂ levels through natural ventilation during the operation of cabins to calculate the natural ventilation rate. We considered CO₂ dilution factor during natural ventilation which indicates the exchange rate of indoor air with outdoor air. As the result of the study, the change in CO₂ level could be quantified and it was found that approx. 35% of the indoor air was exchanged with outdoor air through natural ventilation.

Keywords

Natural ventilation CO2 levels Subway cabin Indoor air quality

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References

Cheng X. , Tan Z. , Tay R. , Yuan W. : Air quality in transportation cabins - Part I: How much do we know about it ? ASHRAE Trans 2006;112: 505-517.

Kim KY , Kim YS , Roh YM , Lee CM , Kim CN : Spatial distribution of particulate matter (PM10 and PM2.5) in Seoul Metropolitan Subway stations: J Hazardous Materials 2008 ;154:440-443.

Kwon S-B. , Cho Y. , Park D. , Park E-Y. : Study on the indoor air quality of Seoul Metropolitan subway during the rush hour: Indoor Built Environ 2008;17:361-369.

Li T-T. , Bai Y. -H, Liu Z. -R, Liu J. -F, Zhang G.-S. , Li J-L : Air quality in passenger cars of the ground railway transit system in Beijing , China: Sci Total Environ 2006; 367:89-95.

Park D-U. , Ha K-C. : Characteristics of PM10, PM2.5, CO2 and CO monitored in interiors and platforms of subway train in Seoul, Korea: Environ Int 2008;34:629-634.

Park D-S. , Kim D. , Cho Y. , Kwon S-B. , Park E-Y. : Air quality and PM10 source analysis on the railway vehicles: J Korean Soc Atmos Environ 2007; 23:311-321.

Hong Kong Environment Protection Department (HKEPD) : Practice note for managing air quality in air-conditioned public transportation - Railways. 2003.

Korea Ministry of Environment (KME) : Guidelines on the Management of Indoor Air Quality of Public Transportations. 2007.

Wong LT , Mui KW : A transient ventilation demand model for air-conditioned offices: Appl Energy 2008; 85:545-554.

10.

Santamouris M. , Synnefa A. , Assinmakopoulos M. , Livada I. , Pavlou K. , Papaglastra M. , Gaitani N. , Kolokotsa D. , Assimakopoulos V. : Experimental investigation of the air flow and indoor carbon dioxide concentration in classrooms with intermittent natural ventilation: Energ Buildings 2008; 40:1833-1843.

11.

Shendell DG , Prill R. , Fisk WJ , Apte MG , Blake D. , Faulkner D. : Associations between classroom CO2 concentrations and student attendance in Washington and Idaho: Indoor Air 2004; 14:333-341.

12.

Korea Ministry of Environment (KME) : Situation survey on and management measures for indoor air quality of public transportations such as subway, Final Report. 2006.

13.

UIC Code 553, Ventilation, heating and air-conditioning in coaches. 2004.

14.

ASHRAE: Chap 9. Surface Transportation, ASHRAE Handbook, 2003.

15.

Chow WK : Ventilation of enclosed train compartments in Hong Kong: Appl Energy 2002;71:161-170.

16.

Cho Y-S. , Kang S-T. , Park Y-H. : A survey of the optimal ventilation rate and the permissible CO2 concentration in the saloon: Proc Korean Soc Railway 2005; 312-317.

17.

Korail , Korea Railway Statistics Annual Report . 2006.

18.

Kwon S-B. , Cho Y. , Park D. , Park E-Y. : Correlation between number of passengers and CO2 concentration in the subway saloon: Proc Korean Soc Atmos Environ 2007 , p. 213.

19.

Leutwyler M. , Siegmann K. , Monn Ch : Suspended particulate matter in railway coaches: Atmos Environ 2002;36:1-7.

20.

Yoo J-H. : A study on calculation of optimum ventilation volume through measurement of CO2 levels in the subway. Masters thesis, University of Seoul. 1998.

Measurement of Natural Ventilation Rate in Seoul Metropolitan Subway Cabin

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