• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2012.04a
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• pp.472-475
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• 2012

MDF(Medium Density Fiberboard) 제조공정에 필요한 열매유(SHTF, Synthetic Heat Transfer Fluid)를 가열하는 보일러에서 화재가 발생하였다. 열매유 보일러는 1차 패스, 2차 패스, 3차 패스로 구성되어 있으며, 화재가 발생된 1차 패스 연소대 위쪽 14단 부근에서 열매유가 방출되었다. 화재확산으로 인한 조사내용 및 데이터를 토대로 화재 시뮬레이션용 전산유체역학인 ANSYS-CFX를 이용하여 재현하고 화재 모델링 해석 및 분석을 통해 화재 온도를 산정하고 피해의 범위를 규정하였다. 본 화재 사고로 설비의 운전 및 소재에 대한 피해를 규정하고, 이론에 의한 과학적인 정밀 조사를 실시하여 향후의 안전 운전을 위한 제안을 하고자 한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.04a
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• pp.128-133
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• 2007

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2008.11a
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• pp.356-362
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• 2008

This study is intended to evaluate the characteristics of smoke spreading and the appropriateness of evacuation time extended by operation of smoke control system during fire within the underground space of the building structured in compliance with the smoke control system performance criteria from the local fire safety standard in Korea. As a preceding review of this study, the combustibles was categorized and identified their heat release rates. For validate the estimated values, modeling a single underground shop was carried out. And a numerical analysis both in case of smoke control system in operation and the system not in operation was carried out of underground space. From the viewpoint of securing the evacuation time, the results were compared in an attempt to assess the appropriateness of the fire safety criteria.

• Fire Science and Engineering
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• v.23 no.6
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• pp.82-90
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• 2009

Natural smoke ventilator is one of domestic prescriptive methods to be used to exhaust smoke in case of fire in a high-rise buildings. The goal of this study is to evaluate the stack effect and the smoke exhaust performance in high-rise buildings with the opening of natural smoke ventilators using computer modeling technology, thus to estimate its effectiveness as a tool of smoke exhaust. For this purpose, the pressure differential in a domestic high-rise building with natural smoke ventilators was experimentally measured to analyze the stack effect with the closure or the opening of natural smoke ventilators and to calculate compensated air leakage of the building. Computer modeling based on experimentally measured data was carried out to estimate effectiveness of natural smoke ventilators in high-rise buildings using CONTAMW network program.

• Fire Science and Engineering
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• v.30 no.5
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• pp.116-123
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• 2016

The quantitative risk assessment methods for thermal failure in targets were studied using fire modeling. To this end, Fire Dynamics Simulator (FDS), as a representative fire model, was used and the probabilities related to thermal damage to an electrical cable were evaluated according to the change in fire area inside a specific compartment. 'The maximum probability of exceeding the damage thresholds' adopted in a conservative point of view and 'the probability of failure' including the time to damage were compared. The probability of failure suggested in the present study could evaluate the quantitative fire risk more realistically, compared to the maximum probability of exceeding the damage thresholds with the assumption that thermal damage occurred the instant the target reached its minimum failure criteria in terms of the surface temperature and heat flux.

• Fire Science and Engineering
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• v.21 no.4
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• pp.12-17
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• 2007

This paper investigated pressure differentials in the elevator lobby depending on reference pressures of the pressurizing damper using FDS fire modeling. The results showed the temperatures and pressures in the contained fire room with small leak gaps can increase significantly. Setting reference pressure of the pressurizing dampers to 0 Pa can cause reduction of real pressure differentials and air velocity to resist smoke flow. This would cause smoke movement from fire room to elevator lobby which should be safe area for evacuation.

• Fire Science and Engineering
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• v.33 no.1
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• pp.23-29
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• 2019

Rechargeable battery such as lithium-ion battery has been noticed as a kinds of the energy storage system in the recent energy utilization and widely used actually in various small electronic equipment and electric vehicles. However, many thermal runaway caused battery accidents occurred recently, which still is obstacle for advanced application of lithium ion battery. One of the main differences to general fires is the existence of ionized electrolyte with electron during combustion. Therefore, we simply simulated the ion addition effects of battery fires by introducing an ionized fuel in jet diffusion flames. When the ionized methane through a corona discharge was used as fuel, the overall flame stability and shape such as flame length showed no significant difference from normal methane flame, but NOx and CO emissions measured at the post flame region decreased. The ion addition effect of methane oxidation was also numerically simulated with the modeling of hydrogen addition in the mixture. It was confirmed that the hydrogen addition at a fixed temperature had a similar effects on ionization of methane and hence could be modeled successfully.

• Fire Science and Engineering
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• v.21 no.1 s.65
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• pp.1-6
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• 2007

This paper investigated the fire and smoke behavior in the compounded multiplex theater using FDS with various spacial and boundary conditions to ensure the fire safety of the multiplex. The results showed that more rapid temperature increase and smoke can be induced near the exit door for the lower fire load duo to the horizontal smoke movement. The overuse of fire resistants can generate more smoke while delaying combustion rate, which can give adverse effect to the evacuation. The mal-function of the exhaust fan would obstruct smoke exhaust but also retard the function of sprinkler head.

• Fire Science and Engineering
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• v.10 no.4
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• pp.13-18
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• 1996

A general description of sprinkler activation time in compartment-fire-generated smoke layers is made. For calculation of the time hot layer temperature is obtained from two-layer zonal model and time constant of sprinkler is measured. Upper-layer thickness at the instant of sprinkler activation is also presented with changes of opening area. The output of the present study provide inputs for the interaction modeling of sprinkler spray and compartment fire environment, which simulates fire suppression phenomena. Futhermore, experiments are performed in mock-up with gasoline pool fire in order to evaluate the reliability of the model.

• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.319-322
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• 2001

본 논문에서는 고층빌딩의 화재감지/모니터링 시스템에 대한 기준 모델을 제시하고 제시된 모델의 성능을 시뮬레이션을 통하여 검증하였다. 본 논문에서 제시하는 화재감지/모니터링 시스템 모델은 CSMA/CD 방식으로 동작하며 100 Mbps의 전송속도로 동작하는 Fast Ethernet을 백본망으로 사용하고 하부망으로는 MS/TP를 사용한다. 또한 시스템의 확장성과 유연성을 확보하기 위하여 현재 국내 빌딩 자동화 통신망의 표준 프로토콜로 제정된 BACnet을 기반으로 동작한다. 본 논문에서는 제시된 화재감지/모니터링 시스템 모델의 성능을 분석하기 위하여 이산사건 시스템 모델링 전용 툴인 ARENA를 사용한 시뮬레이션 모델을 개발하였다. 개발된 시뮬레이션 모델을 이용하여 네트워크 지연시간이 화재감지/모니터링 시스템의 성능에 미치는 영향을 분석하였으며, 분석된 결과를 바탕으로 본 논문에서 제시한 화재감지/모니터링 시스템 모델이 고층빌딩의 방화 설비 요구사항을 만족시킬 수 있음을 검증하였다.