• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1996.11a
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• pp.62-67
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• 1996

The smouldering combustion of cellulose Insulation treated with boric acid - borax - aluminium sulfate as combustion retardants are examined by candle type combustibility tester. The flammability behavior of combustion process is LOI, Smouldering region, Smouldering, Flamming spread region and Flame spread region. In this experiment, Particle size of four examined LOI, L.Point, H.Point, at the biggest size show high LOI. The surface area is connected with thermal conduction. The phenomena of combustion transition are governed by quantity of combustible gas generation in heating zone of cellulose insulation.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2005.11a
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• pp.118-119
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• 2005

Recently, fire extinguishing systems based on water mists have been attracting public attentions in marine engineering. Performance of the fire extinguishing systems is influenced by the size and distribution of spayed water mists. Droplet analyzing method based on image processing technique for measuring droplet size and distribution has been developed. The morphological method based on partial curvature information of pre-processed images was adopted for recognition and separation of overlapped particles. Tested results show that the present method may be reliable for the analysis of the size and distribution of droplets produced by water mist spay flow.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2006.06a
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• pp.307-308
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• 2006

Recently, fire extinguishing systems based on water mists have been attracting public attentions in marine engineering. Performance of the fire extinguishing systems is influenced by the size and distribution of spayed water mists. Droplet analyzing method based on image processing technique for measuring droplet size and distribution has been developed. The morphological method based on partial curvature information of pre-processed images was adopted for recognition and separation of overlapped particles. Tested results show that the present method may be reliable for the analysis of the size and distribution of droplets produced by water mist spay flow.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.2
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• pp.347-353
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• 2012

In this paper, authors will develop the quick and precise remote controller of automatic fire detection equipment (P-type one-class receiver) based on information communication technology (IT). The remote controller detects the fire and disaster in the building automatically and quickly and then activates the facilities to extinguish the fire and disaster, monitoring such situation in a real time through wire-wireless communication network. The proposed remote controller is applied a programmable logic device (PLD) micom. of one-chip type which is small size and lightweight and also has highly sensitive-precise reliabilities. The one-chip type PLD micom. analyzes digital signals from sensors, then activates fire extinguishing facilities for alarm and rapid suppression in a case of fire and disaster. The detected data is also transferred to a remote situation room through wire-wireless network of RS232c and bluetooth communication, and then the situation room sends an emergency alarm signal. The automatic fire detection equipment (AFDE) based on IT will minimize the life and wealth loss while prevents fire and disaster.

• Fire Science and Engineering
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• v.19 no.2 s.58
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• pp.29-36
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• 2005

We carried out discharge and fire extinguishing tests of new inert gas clean agent, which consists of $92\%$ nitrogen and $8\%$ carbon dioxide, as an alternative of Halon that is banned by Montreal Protocol to protect the ozone layer of the earth. Discharge and fire extinguishing tests were performed in $27m^3$ and $190m^3$ rooms with piping which allows gaseous agent to transport from storage to test rooms. We confirmed that it took less than regulation time, 60 seconds for the discharge of over $95\%$ initial charged amounts. Discharge test variables were piping length and orifice size. Fire extinguishing tests verified that this new inert gas clean agent is suitable for both n-Heptane fire and deep seated fire of wood crib.

• Fire Science and Engineering
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• v.33 no.3
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• pp.44-50
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• 2019

In rack-type warehouses, it is difficult to extinguish fires effectively using sprinkler systems because high fire load commodities are stacked vertically and densely. In this study, an actual size rack structure was constructed and the effectiveness of the fire extinguished by the sprinkler system was confirmed through fire tests according to the type and arrangement of the sprinkler head in the rack structure. Through this study, to effectively suppress fires in rack-type warehouses, it is necessary to use sprinkler heads with a volume of more than 115 LPM and sprinkler heads need to be installed at the diagonal corner positions of the commodities of each rack.

• Fire Science and Engineering
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• v.21 no.3
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• pp.61-68
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• 2007

The purpose of this study analyzes heat flows and fire behavior through a reduced-scale model experiments about change of wind velocity in underground life space. When the wind velocity is increased the temperature rise time of the fire room was risen fast. And temperature of fire room was increased. And increase of wind velocity displayed maximum temperature at an opening of the fire room. Heat flows by fire spread increase size of smoke occurrence and flame, and displayed high temperature distribution in passageway than inside of neighborhood department promoting eddy flow spread as wind velocity increases. Finally, heat flows are decided by wind and wind velocity at fire of underground life space, and Wind velocity increases, temperature increase and decrease could confirm that is gone fast.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.29 no.1 s.232
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• pp.151-158
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• 2005

A characteristic of discharge for a foam spray nozzle with various parameters was investigated. The discharge patterns from a fire foam spray nozzle are important to evenly spray over a maximum possible floor area. Two parameters of a foam spray nozzle were chosen, and compared with those from the standard one. Also, in order to evaluate the performance of discharged foam agents used to protect structures from heat and fire damages, the thermal characteristics of fire-protection foams were experimentally investigated. A simple repeatable test for fire-protection foams subjected to fire radiation was developed. This test involves foam generation equipment, a fire source for heat generation, and data acquisition techniques. Results show that the bubble size of foam is increased by large inside diameter of orifice or closed air hole, but phenomenon of discharge angle and expansion ratio is opposite. For the case of the open air hole, liquid film of a circular cone discharges with formation, growth, split and fine grain. In case of the closed air hole, a pillar of foam solution discharges with that. Though the temperature gradient in the foam increases with increased foam expansion ratio. it is not change with increased intensity of heat flux.

• Fire Science and Engineering
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• v.25 no.6
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• pp.39-43
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• 2011

In this research, full-scale fire test was performed on a real house for the evaluation of the performance of waterworks direct-coupled sprinkler system. The fire was set to occur as spontaneous combustion as the cooking oil overheats. The size of house is $56m^2$ and it consists of a living room, a kitchen, and a room. In order to verify the performance of waterworks direct-coupled sprinkler system, it was installed in the kitchen. The result of the test showed that the fire started from the kitchen enlarged up to its ceiling but it was soon exhausted as the sprinkler started to work. The pressure of the waterworks was 0.28 MPa when the sprinkler operated, by which it verified that fire could go out even by waterworks pressure of the general residence.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.1984-1989
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• 2008

In this study, fire simulations were performed to analyze the characteristics of the fire driven flow and the effects of the platform screen door on the smoke flow in the station, when the fire occurred in the center of the platform. Soongsil Univ. station (line number 7, 47m in depth underground) was chosen which was the one of the deepest underground subway stations in the Seoul metro, SMRT. The parallel computational method was employed to compute the heat and mass transfer eqn's with 6 CPUs of the linux clustering machine. The fire driven flow was simulated with using FDS code in which LES method was applied. The Heat release rate was 10MW and The Ultrafast model was applied for the growing model of the fire source. The 10,000,000 structured grids were used.