• Fire Science and Engineering
• /
• v.10 no.4
• /
• pp.37-42
• /
• 1996

The "Intelligent Fire detecting and Extinguishing System" is an up-to-date fire protection system for modern high-rise buildings, international airports, enormous industrial facilities, dome stadiums such as specific areas in which the application of our local fire protection regulation could not be satisfied. The state-of-the art initiating devices communicated with sophisticated network control panels enable peoples to get reliable and powerful suppressions using water or gas, providing absolute protection. The Intelligent Water Cannon System, the Low Pressure $CO_2$ System and the MXL Networking Fire Alarm System introduced in this paper accomplish the dynamic protection for the special hazards.

• Journal of the Korean Institute of Gas
• /
• v.14 no.6
• /
• pp.31-37
• /
• 2010

In this study, to propose the analysis method of heat and smoke behavior of fire using the CFD-based fire simulator FDS, comparison of the simulation results against the experimental results and the sensitivity of the results to the grid sizes have been investigated. For the wood fire, thermal images captured from the experiments were compared against the FDS simulations, and the maximum temperatures agreed in~4.3 % error, showing the applicability of FDS in the interpretation of the fire phenomena. In the aspect of the sensitivity to the grid size for the subway fire, FDS results of smoke temperature, CO concentration and visibility converged and showed no distinct changes for the grid size < $28(L){\times}28(W){\times}14(H)$, guaranteeing that the FDS fire model set in this research could interpret the fire phenomena successfully.

• Journal of the Korean Institute of Gas
• /
• v.24 no.1
• /
• pp.56-65
• /
• 2020

Forecasting of coming fire accidents is quite a challenging problem cause normally fire accidents occur for a variety of reasons and seem randomness. However, if fire accidents that cause critical losses can be forecasted, it can expect to minimize losses through preemptive action. Classifications using machine learning were determined as appropriate classification criteria for the forecasting cause it classified as a constant damage scale and proportion. In addition, the analysis of the periodicity of a critical fire accident showed a certain pattern, but showed a high deviation. So it seems possible to forecast critical fire accidents using advanced prediction techniques rather than simple prediction techniques.

• Nuclear Engineering and Technology
• /
• v.54 no.8
• /
• pp.2898-2914
• /
• 2022

When evaluating energy balance and temperature in reduced-scale fire experiments, which are conducted as an alternative to full-scale fire experiments, it is important to consider the similarity in the scale among these experiments. In this paper, a method considering the similarity of energy balance is proposed for setting the conditions for reduced-scale experiments of mechanically ventilated compartment fires. A small-scale fire experiment consisting of various cases with different compartment geometries (aspect ratios between 0.2 and 4.7) and heights of vents and fire sources was conducted under mechanical ventilation, and the energy balance in the quasi-steady state was evaluated. The results indicate the following: (1) although the compartment geometry varies the energy balance in a mechanically ventilated compartment, the variation in the energy balance can be evaluated irrespective of the compartment size and geometry by considering scaling factor F (∝h_effA_wR_T, where h_eff is the effective heat transfer coefficient, A_w is the total wall area, and R_T is the ratio of the spatial mean gas temperature to the exhaust temperature); (2) the value of R_T, which is a part of F, reflects the effects of the compartment geometry and corresponds to the distributions of the gas temperature and wall heat loss.

• Journal of the Korean Institute of Gas
• /
• v.4 no.2 s.10
• /
• pp.20-26
• /
• 2000

In this experimental study, we examined gas engine characteristics of a small high-speed engine in various ways. And we studied performance of natural gas, hydrogen gas and gasoline fuel engines, as emission characteristics and process of combustion. For the purpose of preventing back-fire occurred in case of high-speed and high load in hydrogen engine, we controlled air quantity by installing throttle valve in gas fuel engine. We performed experiment by mixing nitrogen to hydrogen fuel. As a result, we could find out characteristics which of a high speed small engine by applying gas fuels.

• Journal of the Korean Institute of Gas
• /
• v.17 no.6
• /
• pp.15-19
• /
• 2013

This paper is to analyze and study the cause of fire examples produced because of short phenomenon by electric connecting damage and contacting engine over-heating with combustible materials in engine room of vehicle. In the first example, it knew the fact that the fire produced by contacting with body of vehicle because of loosed of bracket bolt for wire fixing that installed on the transmission case the battery power cable supply the power from battery of engine room to starting motor. In the second example, it certified the fire by short phenomenon because of insulation tape melting wound wiring lined from battery to starting motor. In the third example, it sought for fire's cause that melting phenomenon the wire coating by overheated engine as the wire disconnected with connector by the vibration. Therefore, the fire of system including engine electric made in the danger the people in the car by failure of engine and other system. And than, the car's driver must manage and examine a vehicle conscientiously.

• Fire Science and Engineering
• /
• v.31 no.3
• /
• pp.73-78
• /
• 2017

In this paper, the fire risk using a bimetal type thermometer for construction installation is presented. Because construction equipment is used widely in the field and the site is exposed to explosions and fire by combustible gas or fume, strong restrictions on the structure and usage are applied. Moreover, the risk of fire increases as precise temperature measurements are poorly conducted via an inner temperature sensor inside construction furnace. Therefore, this paper presents the results of structural analysis of a bimetal temperature sensor which is used widely in construction installation and temperature measurement experiments relative to the material property of the target object. The results revealed the relatively precise temperature of the liquid object, whereas those of the gas and solid object showed a lower temperature compared to the real temperature. This shows that bimetal-type temperature sensor is more suitable for measuring a liquid state object than measuring a gas or solid state object.

• Journal of Korean Institute of Fire Investigation
• /
• v.10 no.1
• /
• pp.29-35
• /
• 2007

가스보일러의 확대 보급으로 2006년도 932만대가 주택, 상가 및 산업현장 등에 보급되어 생활의 편리성이 높아지고 있으나 가스보일러의 설치불량, 관리소홀 및 제품의 노후 등으로 사고가 끊이지 않고 발생하고 있다. 가스보일러가 연소 중에 발생하는 배기가스가 실내에 유출되어 최근 5년간 30건의 사고로 사상자가 92명이 발생하는 등 1건의 사고로 3명이상의 높은 인명 피해를 나타냈다. 본 연구에서는 가스보일러의 사고통계분석과 2건의 사고사례를 분석한 결과 가스보일러의 제품의 안전성 향상과 실내에 배기가스가 누출되었을 때 신속히 검지할 수 있는 경보시스템의 방안이 필요할 것으로 보인다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 1997.11a
• /
• pp.275-281
• /
• 1997

The destruction by accident is affected by the blast of explosion. However, there are few of research on the external effect of vented gas explosions. Therefore it is necessary to study the effect of vented explosion. This study aims to find the characteristics of gas explosion, and the effect of vented gas explosion. Using an explosion chamber, we obtained a LPG explosion characteristics according to the vent size and concentration. The result of experiment showed that the explosion pressure effect to external space was much stronger than inner space during the course of a gas explosion. And the external pressure become higher in explosion pressure as the vent diameter become smaller.

• Journal of the Korean Institute of Gas
• /
• v.17 no.6
• /
• pp.58-66
• /
• 2013

Among the risks which can be faced with fire, combustion toxicity is a significant influence on the survival. Fire toxicity researches have been limited generally on the lethal aspects. In this study, HF gas which can be generated from fire, and also found in general industrial site was used for analysis. Blood analysis and biochemistry analysis performed to find internal demage of experimental animals which were used for measuring average activity stopping time from Animal test(KS F2271: Gas hazard test). In addition, Using the malondialdehyde analysis, indicators of oxidative damage, we had quantitative analysis to target lymphocyte for measuring the oxidative damage caused by toxic substances.