• Title/Summary/Keyword: PSD(Platform screen door)

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A Numerical Study of Ventilation System Operation for Smoke Control in a Subway Station when a Train under Fire is Approaching (화재열차가 진입하여 정차하는 지하철 역사에서 제연을 위한 환기장치 운전에 대한 수치해석 연구)

  • Lee, Seung-Ho;Hur, Nahm-Keon;Cha, Chul-Hyun;Ryou, Hong-Sun;Kim, Dong-Hyeon;Jang, Yong-Jun
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.136-141
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    • 2009
  • The platform screen door(PSD) is installed in the station of the Seoul Metro 9th line for passengers' safety and comfortable environment of the station. The track way exhaust system(TES) is also operated with PSD to exhaust heat released from train. TES can also be used for the purpose of the heat and smoke control in an emergency case of the carriage fire. When the fire is occurred, operation of TES is switched to the smoke exhaust mode form its normal ventilation mode. In the present study, a subway station of Seoul Metro 9th line is modeled, and a 3-D CFD simulation is performed to investigate effectiveness of designed TES in case of fire. A scenario that a train under fire is arriving the station is simulated for several possible operation modes of the TES using moving mesh technique. As a result, temperature and CO concentration distribution in the station is obtained for each operation modes of TES. The effectiveness of TES operation in case of fire is also discussed.

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Analysis of Cooling Air Current and Efficiency of Air Conditioning in the Underground Subway Station with Screen-Door Opening and Closing (도시철도 역사 스크린 도어 개폐에 따른 냉방 기류 해석 및 효율 비교 분석)

  • Jang, Yong-Jun;Ryu, Ji-Min;Jung, Ho-Sung
    • Journal of the Korean Society for Railway
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    • v.17 no.5
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    • pp.328-335
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    • 2014
  • Numerical prediction methods were applied to investigate the turbulent air currents and air-conditioning efficiency in an underground subway station, and the results compared to experimental data. The Shin-gumho Station($8^{th}$ floor underground and 43.6m in depth) in Seoul was selected for the analysis. The entire station was covered for simulation and the ventilation mode was ordinary. The ventilation diffusers were modeled as 95 square shapes of $0.6m{\times}0.6m$ in the lobby and as 222 square shapes in the platform. Cooling air of $47,316m^3/h$ was supplied and the returned air of $33,980m^3/h$ is exhausted in the lobby and the cooling air of $33,968m^3/h$ is supplied and the returned air of $76,190m^3/h$ was exhausted in the platform which is the same as the experimental data. The cases of the screen-door-closed and open were respectively investigated. A total of 7.5million grids were generated and the whole domain divided into 22 blocks for MPI efficiency of calculation. Large eddy simulation (LES) was applied to solve the momentum and energy equation.

Development of Air Cleaning Roll-Filter for Improving IAQ in Subway (도시철도 객실 공기질 개선을 위한 롤필터 개발연구)

  • Kwon, Soon-Bark;Park, Duck-Shin;Cho, Young-Min;Kim, Jong-Bum;NanGoong, Seok;Han, Tae-Woo;Cho, Kwan-Hyun;Kim, Tae-Sung
    • Journal of the Korean Society for Railway
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    • v.14 no.4
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    • pp.313-319
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    • 2011
  • In a modern society, various type of transportation modes are utilized, among them the subway system is the one of the main transportation mode which more than 7.21 million people ride a day in Seoul. Due to the increased interests on the indoor air quality (IAQ) of underground facilities, public concerns on IAQ of subway system are increasing also. Platform screen door (PSD) recently installed at the whole stations of Seoul subway and tunnel washing-out appeared to be effective in reducing particulate matters in the platform and tunnel. However there has not been any attempt to improve IAQ of subway cabin inside. Most technologies for removing airborne particulate matters are known to be difficult to adopt on the subway cabin due to the problem of maintenance cost. Therefore, the object of this study is a practical development of cabin air cleaning system which can reduce the concentration of airborne particles and harmful gases at the same time. In this paper, we focused on the development of particle removing system utilizing a roll-filter for increasing operating time of air filter. The prototype of system was designed and manufactured based on the numerical prediction results. For rollfilter device, 5 candidate filter materials were tested in point of particle collection efficiency and pressure drop. It was found that the electrically charged filter material showed the highest performance among them.

Research Study on Indoor Air Quality (IAQ) inside of the Subway Cabin in Seoul Metropolitan City (지하철 전동차 객실 내부 공기질 조사 연구)

  • Lee, Kyoung Bin;Kim, Jin Sik;Bae, Sung Joon;Kim, Shin Do
    • Journal of Korean Society for Atmospheric Environment
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    • v.30 no.2
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    • pp.175-187
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    • 2014
  • The subways play an important part in serious traffic problems. Almost seven million citizens a day are using subways as a means of traffic communication in the Seoul metropolitan city in 2012. However, the subway system is a semi-closed environment, so many serious problems occurred in subway stations and injured passengers' health. Platform screen doors (PSD) are expected to prevent negligent accident such as injury or death from falling and improve the air quality of the subway station. Installation of PSD at stations in Seoul metropolitan subway had been completed in December 2009. Consequently, the underground transportation system became a closed environment, so the air quality has improved the platforms, but it has deteriorated in the tunnels. Especially, the subway cabin has many doors, and the doors are frequently opened and closed. For this reason, the effect of door opening on subway cabin, dust flow inside the subway cabin. In this process, the maintenance work may influence the health of people who work underground, as well as that of subway users (passengers). In this study, we measured air quality inside and outside of the subway cabin line 2 in Seoul, Korea. This study focused on the investigation of Indoor Air Quality (IAQ) and measurement target pollutants are PM10, CO, $CO_2$, $NO_2$, $O_3$. It was found that levels of PM10, $CO_2$, and $NO_2$ inside subway cabin line 2 exceeded the Korea IAQ standard. Concentrations of PM10, $CO_2$, and $NO_2$ inside of the cabin are higher than outside of the cabin (Indoor Outdoor ratio is higher than 1.). Concentrations of CO, $O_3$ inside of the cabin are lower than outside of the cabin (Indoor Outdoor ratio is lower than 1.). There is a high correlation between $CO_2$ and passengers inside of the cabin and PM10 is only the weakest correlation with passengers. Therefore, it is important to find out the emission source of $NO_2$. The results of this study will be useful as fundamental data to study indoor air quality of a subway cabin.