• Title/Summary/Keyword: 도로터널 환기 시스템

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A study on the effects of exhaust emission standards on the required ventilation rate in vehicle tunnels (차량 배출가스 규제기준이 소요환기량에 미치는 연구)

  • Kim, Hyo-Gyu;Ryu, Ji-Oh;Song, Seog-Hun;Jung, Chang-Hoon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.19 no.3
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    • pp.409-420
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    • 2017
  • The amount of ventilation required in making the tunnel ventilation plan is an important factor for determining the capacity of the ventilation system. The amount of pollutant emission for each type of vehicle (basic emission amount for the design of ventilation volume) for estimating the required ventilation amount is based on the 'Standard for Allowing the Emission for the car manufacturing', proposed by Ministry of Environment. However, in 2013, the Ministry of Environment announced the 'Regulations on the calculation method of total emissions from vehicles' as a regulation for calculating the pollutants emitted from vehicles. In this regulation, there are the 'Emission factors for each type of vehicle'. Therefore, it is necessary to review the application of the Regulation to the estimation of the required ventilation volume for the road tunnel. In this study, the influence of the strengthened emission regulation in 2015 caused by the case of manipulation of emission volume for the diesel vehicle on the calculation of the required ventilation volume in the road tunnel has been checked. In addition, in this study, the required ventilation volume calculated according to the Standard for Allowing the Emission for the car manufacturing revised by Ministry of Environment and "Emission factors for each type of vehicle" and that calculated according to the EURO emission standard were compared for analysis. This study has implications that it provides the basic design data for calculating the reasonable ventilation capacity of the ventilation system based on the ground for calculating the required ventilation volume.

Full-scale Fire Suppression Test for Application of Water Mist System in Road Tunnel (미분무수 소화시스템의 도로터널 적용을 위한 실물 화재 실험)

  • Han, Yong-Shik;Choi, Byung-Il;Kim, Myung-Bae;Lee, Yu-Whan;So, Soo-Hyun
    • Fire Science and Engineering
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    • v.25 no.3
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    • pp.51-56
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    • 2011
  • The full-scale experiments are carried out to investigate the fire suppression characteristics of water-based fire fighting systems in a road tunnel. Applied systems are the low-pressure water spray system at 3.5 bar and the high-pressure water mist system at 60 bar. The water flow rate of the high-pressure system is one sixth only of the water spray system. A passenger car and a heptane fuel pan with area of $1.4m^2$ are used as fire sources. A blower system is installed at the tunnel exit to realize the longitudinal ventilation conditions (0.9~3.8 m/s) in the tunnel. Temperatures from the fire source to the down-stream direction are measured by K-type thermocouple trees. The experimental results show that the cooling effect of the high pressure water mist system in the test conditions were equivalent to that of the low pressure water spray system for B-class fire.

A NUMERICAL STUDY OF THE VENTILATION AND FIRE SIMULATION IN A ROAD TUNNEL (도로터널 환기/제연 시스템 시뮬레이션)

  • Park Jong-Tack;Won Chan-Shik;Hur Nahmkeon;Cha Cheol-Hyun
    • 한국전산유체공학회:학술대회논문집
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    • 2005.10a
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    • pp.207-212
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    • 2005
  • In designing a ventilation system of a road tunnel, a possibility of using the system as a smoke control system in case of a tunnel fire has to be considered. In the present study, a numerical simulation on ventilation system is performed considering jet fan operations and moving traffic. A fire-mode operation by reversing some fan operations in case of a tunnel fire is also simulated. The results show that ventilation operation can control the pollutants effectively, and fire-mode operation can control smoke and temperature effectively to prevent a disaster.

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차량터널 오염물질 농도 예측 시뮬레이션 모델 연구

  • 이창우;양원철;이송희
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • 1996.03a
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    • pp.107-118
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    • 1996
  • 최근 급격히 장대화 하고 있는 차량 터널의 효율적 건설 및 운영을 위하여 관련 기본 요소 기술 중 특히 국내 기술 수준이 낙후한 분야 중의 하나인 환기 시스템 설계 기술에 대한 관심이 높아지고 있다. 외국의 경우에 비하여 상대적으로 늦긴 했으나 1990년 환경처가 지하 공간 환경 기준 권고치를 설정 발표함으로써 보사부의 공중 위생법, 건설부의 도로법, 노동부 고시 등에 의한 관리 대상이던 터널 내 오염 물질도 직접적인 규제 대상이 되었다. (중략)

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A study on the program development for area optimizing of damper ports in road tunnels with transverse ventilation system (횡류식 도로터널의 급, 배기구 포트 개구면적 최적화 프로그램 개발 연구)

  • Jo, Hyeong-Je;Chun, Kyu-Myung;Min, Dea-Kee;Kim, Jong-Won;Beak, Jong-Hoon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.21 no.1
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    • pp.177-188
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    • 2019
  • The purpose of the optimization of the installation of supply/exhaust ports for tunnels with transverse ventilation system is to supply fresh air from outside to inside of tunnels uniformly and exhaust pollutant from tunnels properly for creating safe and clean environment for tunnel users. For this purpose, a ventilation port area optimization program was developed to obtain a uniform supply or exhaust air volume inside a great depth double deck tunnel with transverse ventilation system. In order to area optimize the developed port sizing program, the wind velocity was measured in the duct of the currently operated tunnel with semi-transverse ventilation. Also 3D cfd was performed on the same tunnel and cfd results were compared to the measured value. As a result, the error rate between the predicted value from the program and measured value was 6.72%, while the error rate between the predicted value from the program and 3D cfd analysis value was 4.86%. Both of comparison results show less than 10% of error rate. Thus It is expected that supply/exhaust port optimization design of transverse ventilation tunnel can be possible with using this large exhaust port area optimization program.

The Effects of Tunnel Geometrical Characteristics and Canopy Installation on the Ventilation and Fire Propagation (터널의 기하학적 형태 및 캐노피 설치가 터널 환기 및 화재 확산에 미치는 영향 분석)

  • Lee, Chang-Woo;Suh, Ki-Yoon;Kim, Jung-Wook
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.8 no.4
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    • pp.325-334
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    • 2006
  • Understanding the airflow characteristics within the canopy structure installed between closely adjacent tunnels either for light adaptation or for protection from snow hazards is required for the normal ventilation as well as safety system design. Grade, horizontal alignment, cross-sectional area and shape are known to substantially influence the fire smoke behavior and their influences raise great concern for the safety design. This paper aims at studying the effects of tunnel geometrical characteristics and canopy installation on the ventilation and fire propagation through CFD analysis. In the case of 145m long canopy, 50% opening ratio is preferred with respect to the airflow pattern and ventilation efficiency. When a 20MW fire occurs in a 1.8km-long tunnel and four 1250mm reversible jet fans are instantly turned on, smoke concentration at 40m downstream of the fire decrease 13% for the upgrade tunnel with 2% gradient and increases 20% for -2% gradient, compared to the standard horizontal tunnel. Backlayering is observed within 45m-long segment toward the entrance in 2% down-graded tunnel. In a rectangular tunnel, there is no significant difference of smoke concentration as well as velocity profile from the standard crown tunnel. Three-laned tunnel shows lower level of both profiles and backlayering is detected up to 50m upstream of the fire, while the risky situation rapidly disappears thereafter.

A study on the development and applicability of fire risk assessment method for small road tunnels passing only small cars (소형차 전용 도로터널의 화재 위험도 평가기법개발 및 적용성에 관한 연구)

  • Ryu, Ji-Oh;Choi, Pan-Gyu
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.20 no.6
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    • pp.917-930
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    • 2018
  • A quantitative risk assessment method for quantitatively evaluating the fire risk in designing a road tunnel disaster prevention facilities has been introduced to evaluate the appropriateness of a disaster prevention facility in a large tunnel through which all vehicle types pass. However, since the quantitative risk assessment method of the developed can be applied only to the large sectional area tunnels (large tunnels), it is necessary to develop a quantitative risk assessment method for road tunnels passing only small cars which has recently been constructed or planned. In this study, fire accidents scenarios and quantitative risk assesment method for small road tunnels through small cars only which is based on the methods for existing road tunnels (large tunnels). And the risk according to the distance between cross passage is evaluated. As a result, in order to satisfy the societal risk assessment criteria, the distance of the appropriate distance between cross passages was estimated to be 200 m, and the effect of the ventilation system of the large port exhaust ventilation system was quantitatively analyzed by comparing the longitudinal ventilation system.

Study on Optimization Technique for Design of the Road Tunnel Ventilation System (도로터널 환기시스템 설계 프로그램 개발)

  • 유지오;이동호;신현주
    • Journal of the Korean Society of Safety
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    • v.14 no.4
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    • pp.60-70
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    • 1999
  • In this study, the computer code for the optimal design of road tunnel ventilation system based on one-dimensional analysis of the air flow was developed. The control volume method was used to calculate the air velocities and the concentration distribution of pollutants(CO, NOx, Particulate) for various tunnel ventilation system. This code was validated by comparing the calculation results to the practical design data for the road tunnel ventilation system. The calculation results were in accord with the practical design data.

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A study on the effect of gusty wind on smoke control performance in road tunnel (돌풍이 도로터널의 제연성능에 미치는 영향 연구)

  • Baek, Doo-San;Cho, Hyeon-Seok;Lee, Seung-Chul
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.24 no.1
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    • pp.95-108
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    • 2022
  • The increase in the use time of tunnel users due to the lengthening of the road tunnel may increase the evacuation time in case of fire, resulting in a large number of casualties. In order to reduce the casualties caused by fire, the "Road Tunnel Design Manual, Part 6 Tunnel" and "Road Tunnel Disaster Prevention Facility Installation and Management Guidelines" stipulate that ventilation facilities should be installed along with the extension of the tunnel. The ventilation system design factor considers the wind speed of the external natural wind to be at least 2.5 m/s, and it is applied upward according to the characteristics of the tunnel. As a result of analyzing the five-minute average wind speed data in the Daegwallyeong region for the past 6 years, it was analyzed that 15.8% of the windy days were winds of 10 m/s or more, and the maximum was 20 m/s. Therefore, in this study, when a fire occurs in a tunnel, the pattern of natural wind flowing into the tunnel and the backlayering distance of the tunnel fire smoke according to the maximum wind speed were analyzed. As a result, it was analyzed that a backflow of up to 490 m occurs when a gust of 20 m/s blows.

A Tunnel Ventilation Control Algorithm by Using CO Density Prediction Algorithm (일산화탄소 농도 예측 기능을 사용한 터널 환기 제어 알고리즘)

  • Han Doyoung;Yoon Jinwon
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.11
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    • pp.1035-1043
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    • 2004
  • For a long road tunnel, a tunnel ventilation system may be used in order to reduce the pollution level below the required level. To control the tunnel pollution level, a closed loop control algorithm may be used. The feedforward prediction algorithm and the cascade control algorithm were developed to regulate the CO level in a tunnel. The feedforward prediction algorithm composed of the traffic estimation algorithm and the CO density prediction algorithm, and the cascade control algorithm composed of the jet fan control algorithm and the air velocity setpoint algorithm. The verification of control algorithms was carried out by dynamic models developed from the actual tunnel data. The simulation results showed that control algorithms developed for this study were effective for the control of the tunnel ventilation system.