• Title/Summary/Keyword: Subway ventilation system

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A NUMERICAL ANALYSIS OF THE TRAIN WIND IN THE SUBWAY TUNNEL (지하철 터널 내 열차풍의 수치해석적 연구)

  • Lee, J.H.;Juraeva, M.;Song, D.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.496-500
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    • 2010
  • Understanding train-wind is the best method to know how to optimize subway ventilation system. The capacity and efficiency of the subway ventilation system are known by pressure and velocity while train runs. Analysis of the internal flow in subway tunnel and around subway station are studied using numerical methods. Characteristics of internal flow and influence of subway ventilation system for the subway station with platform screen door and tunnel are analyzed by unsteady state analysis. Velocity and pressure of train wind transformation are compared at around subway ventilation system and the internal flow is investigated at the subway tunnel.

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Analysis of Air Flow Rate through Subway Vent Shaft with Mechanical Ventilation System for Shape Change of Vent Shaft

  • Kim, Jung-Yup
    • International Journal of Air-Conditioning and Refrigeration
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    • v.17 no.2
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    • pp.45-51
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    • 2009
  • Three-dimensional numerical analyses of mechanical ventilation system in vent shaft of subway in operation are carried out in relation with the different air flow passage of vent shaft and two ventilation operation modes of push/pull, The ventilation characteristics of vent shaft with regard to the shape change are evaluated. And the air flow rate through the vent shaft by ventilation system is measured within subway in operation to assess the accuracy and applicability of the numerical analysis method. The decrease of air flow rate due to vent-shaft change are between 0.7 to 2.2% in the cases examined.

Study on the Subway Platform Thermal Environment for using Natural Energy (자연에너지 활용을 위한 지하철 승강장 열환경에 관한 연구)

  • KIM, Hoe-Ryul;KIM, Dong-Gyu;KUM, Jong-Soo;CHUNG, Yong-Hyun;PARK, Sung-Chul
    • Journal of Fisheries and Marine Sciences Education
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    • v.21 no.2
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    • pp.269-277
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    • 2009
  • Ventilation equipment performs a central role to maintain comfort subway environment. So ventilation equipment of Busan subway line No.1 is required to improve thermal environment. In this study, conditions of thermal environment are presented to improve ventilation equipment at existing subway station platforms by measuring thermal environment of platforms operated ventilation equipment at 14 stations of Busan subway line No.1. AWS of data in comparison with the neighbouring platforms and thermal environment analysis. Thermal environment status of subway platform analysis results are as follows. 1)Daytime platform temperature was higher than outdoor temperature, but night time platform temperature was lower than outdoor temperature. 2)Train wind had effect on improving thermal comfort in platform. 3)When outdoor temperature is below $24^{\circ}C$, inlet air is able to lower than platform temperature. 4)Considering existing ventilation system, night purge systems is useful to improving platform thermal environment.

A Study of Heat and Smoke Exhaust to Subway Tunnel Direction (지하철 터널부로의 열 및 연기배출에 관한 연구)

  • Rie, Dong-Ho
    • Journal of the Korean Society of Safety
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    • v.19 no.3 s.67
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    • pp.1-8
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    • 2004
  • This study aims to derive the operation method of a comprehensive ventilation system which is capable of providing passengers with safe exit paths from platforms in onboard fire situations. To accomplish this, the airflow distributions in subway platforms under 6 types of tunnel vent system were calculated in addition to having analyzed diffusion behaviors of smoke and heat exhaust in such states by performing 6 kinds of different ventilation scenarios in a 3-D Fire Dynamic Simulation (FDS) simulation model. In order to recommend the mechanical smoke exhaust operation mode, Subway Environmental Simulation(SES) is used to predict the airflow of the inlet and outlet tunnel for the subway station to clarify the safety evaluation fir the heat and smoke exhaust on subway fire events.

A study on safety evaluation by changing smoke ventilation mode in subway tunnels (지하철터널 환기변환모드에 따른 안전성 평가에 관한 연구)

  • Rie, Dong-Ho
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.5 no.4
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    • pp.389-400
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    • 2003
  • In order to recommend the mechanical smoke exhaust operation mode, Subway Environmental Simulation (SES) is used to predict the airflow of the inlet and outlet tunnel for the subway station. Fire Dynamic Simulation (FDS) is used the SES's velocity boundary conditions to clarity the smoke exhaust effectiveness by the variations with mechnical ventilation system. We compared each 6 types of smoke exhaust systems for the result of smoke density and temperature distributions for 1.5m height from the subway station base in order to clarify the safety evaluation for the heat and smoke exhaust on subway fire.

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Study on optimization technique for the design of ventilation system of subway (지하철 환기시스템의 최적화에 관한 연구)

  • 김광용;조재형;리쉬밍;양태윤
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.10 no.5
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    • pp.630-639
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    • 1998
  • The present research aimed at development of a computer code for the optimal design of ventilation system based on one-dimensional analysis of the air flow. Model experiment and three-dimensional flow analysis have been implemented to determine loss coefficients that were needed for the optimization technique. A research on optimum shape of ventilation shaft has been also carried out through the three-dimensional analysis of the flow.

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A transient CFD simulation of ventilation system operation for smoke control in a subway station equipped with a Platform Screen Door(PSD) when a train under fire is approaching the station (화재열차의 역사 접근 시 PSD가 설치된 역사 제연을 위한 환기장치 운전 비정상상태 해석)

  • Shin, Kyu-Ho;Hur, Nahm-Keon;Won, Chan-Shik
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.269-272
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    • 2006
  • The heat and smoke which generated by subway under fire is one of the most harmful factor in air tighten underground station. To prevent this, Trackway Exhaust System(TES) can be used. The heat released from the train running in the tunnel raises the temperature at the platform and the trackway, and thus proper ventilation system is required for comfortable underground environment. When the fire is occurred, TES is operated as smoke exhaust mode from normal ventilation mode. In the present study, the subway station which is one of the line number 9 in Seoul subway is modeled, and fired situation is simulated with several ventilation mode of ventilation system in trackway. For this simulation whole station is modeled. Non steady state 3D simulation which considered train under fire is entering to the station is performed. Temperature and smoke distribution in platform and trackway are compared. To represent heat by fire, heat flux was given to the fired carriage, also to describe smoke by fire, concentration of CO is represented. As the result of present study, temperature and smoke distribution is different as the method of ventilation in trackway and platform is changed. In over side of trackway, the fan must be operated as exhaust mode for efficient elimination of heat and smoke, and supply mode of fan operation in under side shows better distribution of heat and smoke. The ventilation system which is changed from ventilation mode to exhaust mode can be applied to control heat and smoke under fire.

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PERFORMANCE EVALUATION OF PASSENGERS' EVACUATION FOR SMOKE-CONTROL MODES IN A SUBWAY STATION (지하역사 제연모드 승객피난 성능평가)

  • Park, Won-Hee;Chang, Hee-Chul;Jung, Woo-Sung;Lee, Han-Su
    • Journal of computational fluids engineering
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    • v.13 no.4
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    • pp.8-12
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    • 2008
  • Heat/smoke detectors are installed in most subway platforms in Korea to detect fire. Subway platform is divided by smoke-control zones for efficient smoke-control. Once the detectors detect heat or smoke, the smoke-control ventilation system in the platform and concourse is activated according to the smoke-control ventilation mode. Smoke-control mode during fires in Korean subway platforms is that the smoke zones operate by exhausting smoke while other zones in the platform and in the concourse which is the upper floor of the platform operate by supplying air or stopping any ventilation. This study is conducted to evaluate performance of passengers' evacuation for various smoke control modes in the subway station. Distribution of smoke and heat due to fire on the platform is analyzed by using Fire Dynamics Simulator(FDS V 4.06) of NIST. Various smoke-control ventilation modes and locations of fire are considered. Evacuation and movement of passengers within the platform is simulated by building EXODUS V.4.0.

Performance Evaluation of Passengers' Evacuation for Smoke-Control Modes in a Subway Station Based on CFD Results (전산열유체 해석결과를 이용한 지하역사 제연모드 승객피난 성능평가)

  • Park, Won-Hee;Jang, Yong-Jun;Lee, Han-Su;Chang, Hee-Chul;Lee, Duck-Hee
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.276-279
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    • 2008
  • Heat/smoke detectors are installed in most subway platforms in Korea to detect fire. Subway platform is divided by smoke-control zones for efficient smoke-control. Once the detectors detect heat or smoke, the smoke-control ventilation system in the platform and concourse is activated according to the smoke-control ventilation mode. Smoke-control mode during fires in Korean subway platforms is that the smoke zones operate by exhausting smoke while other zones in the platform and in the concourse which is the upper floor of the platform operate by supplying air or stopping any ventilation. This study is conducted to evaluate performance of passengers' evacuation for various smoke control modes in the subway station. Distribution of smoke and heat due to fire on the platform is analyzed by using Fire Dynamics Simulator(FDS V 4.06) of NIST. Various smoke-control ventilation modes and locations of fire are considered. Evacuation and movement of passengers within the platform is simulated by buildingEXODUS V 4.0.

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The study for thermal environment improvement at subway station platform (Part 1: Thermal environment status and actual survey results) (지하역사 승강장 열환경 개선을 위한 연구 (제1보: 승강장 열환경 현황 및 실측결과))

  • Kim, Hoe-Ryul;Kim, Dong-Gyu;Kum, Jong-Soo;Jung, Yong-Hyun;Kim, Jong-Ryel;Park, Sung-Chul
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.976-980
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    • 2008
  • Ventilation equipment performs a cental role to maintain comfort subway environment. So ventilation equipment of Busan subway first line is needed to improvement thermal environment. In this study, condition of thermal environment is presented to improve ventilation equipment at existing subway station platforms by measuring thermal environment of platforms operated ventilation equipment at 14 stations of Busan subway first line. AWS of data in comparison with the neighbouring platforms and thermal environment analysis.

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