• Title/Summary/Keyword: Ventilation controled fire

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A Study on the Discrimination of Fire Pattern by the Phenomenological Observation (Focused on the Fire Cases) (현상학적 관찰에 의한 연소패턴의 식별에 관한 연구(사례를 중심으로))

  • Choi, Don-Mook;Choi, Sung-Bok;Choi, Jae-Soung
    • Fire Science and Engineering
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    • v.23 no.6
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    • pp.98-110
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    • 2009
  • The burned patterns of fire are changed very diversely according to the direction of wind, conditions of combustibles, shape of buildings and so on in the fire scenes. And careful attentions are required on the determining of ignition point and fire causes. In this study, we examined that the burned pattern of fuel controlled fires and ventilation controled fires that impose a heavy burden on fire investigators, carbonized marks of floor, formed by flammable liquids, and combustion marks of falling firing materials through the fire cases. We suggest a proper fire investigation method.

A Case Study of Hybrid Air Conditioning and Ventilation System (환기 병용형 냉난방 시스템 설계 및 현장 적용 사례 연구)

  • Lee, Hong-Cheol;Hwang, In-Ju;Shin, Hyun-Joon
    • Proceedings of the SAREK Conference
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    • 2008.11a
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    • pp.89-94
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    • 2008
  • In this study it was evaluated that hybrid air conditioning and ventilation system to reduce energy consumption and keep on comfortable indoor environment in an underground shopping center. Room temperature by hybrid HAVC system was controled as $1.8{\sim}2.1^{\circ}C$ low and indoor humidity was controled as $4.1{\sim}5.0%RH$ low, and response was fast in $2.0{\sim}2.5$ times compared with conventional system. And also transportation efficiency of hybrid HVAC system was improved in about 27%, and total energy consumption rate of hybrid HVAC system is decreased in 16% compared with conventional system.

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An Experimental Study of Smoke Control in Tunnel Fires with Jet Fan (터널화재시 제트팬에 의한 연기제어에 관한 실험적 연구)

  • 이성룡;김충익;유홍선;방기영
    • Tunnel and Underground Space
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    • v.12 no.2
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    • pp.92-98
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    • 2002
  • In this study reduced-scale experiments were conducted to analyze smoke movement in tunnel fire with jet fan, The 1/20 scale experiments were carried out under the froude scaling using gasoline pool fire range from 6.6 to 12.5 cm in diameter with total heat release rate from 0.714 to 4.77 kW. In the case of fires under the 2.5kW, backlaying was reduced about 40cm and smoke was effectively controled in downstream of the fan when operating the fan. The smoke layer was moved down and the ceiling temperature was decreased compared to that of without fan case in upstream of the fan, but the temperature in the lower part of the tunnel was increased.

Scaled model tests for improvement and applicability of the transverse smoke control system on tunnels (횡류식 제·배연 시스템의 개선 및 적용성 분석을 위한 모형실험 연구)

  • Kim, Hyo-Gyu;Baek, Doo-San;Kim, Jae-Hyun;Lee, Seong-Won;Yoo, Ji-Oh
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.22 no.5
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    • pp.563-574
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    • 2020
  • Currently, road tunnels and railroad tunnels are building smoke control systems to emit toxic gases and smoke from fires. Among the various smoke control systems, the transverse smoke control system has the disadvantage that air supply or exhaust is performed on only half of the cross-section, rather than air supply or exhaust on the entire cross-section of the tunnel as air is supplied or exhausted by partitioning the wind path. Therefore, this study analyzed the effect of exhaustion through numerical analysis and scaled model tests on the zoning smoke control system, which improved the limitations of the transverse smoke control system. As a result of the scaled model test, the transverse ventilation system exhibited a 25.6% smoke control rate based on the state where no smoke was controled, and zoning smoke control system showed a smoke control rate of 40.8%. In addition, as a result of numerical analysis, it was found that transverse ventilation system did not control fire smoke spreading from the tunnel and continued to spread. On the other hand, zoning smoke control system was found to be smoke controled within a certain section due to the air curtain effect and the flue gas effect.