• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2013.11a
• /
• pp.229-229
• /
• 2013

본 연구에서는 미세 물분무 노즐의 소화성능을 분석하기 위해 유량계수, 방사거리, 방사각도, 그리고 작동압력에 따라 분사되는 물입자 크기를 측정하였다. 이를 위해서 이중 구조의 미세 물분무 노즐 LPN-61과 LPN-63을 제작하였으며, 미분무 소화설비를 구성하여 이중구조 노즐의 형상에 따라서 유동특성을 정량화하였다. 그 결과 LPN-61은 유량계수 5.116, 방사각 $120^{\circ}{\sim}125^{\circ}$로 작동압력이 $4kgf/cm^2$에서 $10kgf/cm^2$까지 증가함에 따라서 SMD는 $127{\mu}m$정도에서 $88{\mu}m$까지 입자 크기가 감소하였으며, LPN-63은 유량계수 5.121, 방사각도 $120^{\circ}{\sim}125^{\circ}$로 동일한 작동압력 범위에서 SMD는 $108{\mu}m$에서 $80{\mu}m$까지 감소하는 것을 확인하였다.

• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 2002.05a
• /
• pp.397-402
• /
• 2002

노즐을 통하여 미세한 물 입자를 뿜어내어 화재를 진압하는 방식은 1930년대부터 응용되어왔지만 하론이 소화 물질로서 개발되어 널리 사용됨에 따라 물분무에 대한 개발이 중단되었다. 그러나 몬트리올 환경회의에 의해 하론이 오존층 파괴 물질로 사용이 제한됨에 따라 대체 소화물질로서 1990년대에 미세 물분무에 대한 연구가 활발히 진행되기 시작하였으며 최근 IMO(세계 해사기구)에서는 2003년부터 건조되는 선박의 소화설비로서 물분무 노즐 사용을 의무화하기 시작했다.(중략)

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.13 no.1
• /
• pp.1-8
• /
• 2011

Spray density of the water spray system which is installed in long road tunnels and hazardous vehicle tunnels is applied without proper performance assessment process. In this study, the requirements of Spray Density Guidelines at the standard pressure is investigated through spray test set up the nozzle of a water spray system in a simulated road tunnel. The results showed that all the nozzles used in the test area did not meet the requirements of the Guidelines. The absence of performance test codes and inspection process on the nozzle at real scale in tunnels may have caused this practice. Therefore, it is suggested that the performance test regulations of the nozzle on the water spray system is established in order to properly assess the system performance.

• Fire Science and Engineering
• /
• v.29 no.5
• /
• pp.29-33
• /
• 2015

In this study, the relations of flow rate, discharging distance and droplet size are measured in accordance with the nozzle shape. The dual type nozzles of LPN142 and LPN148, which have identical core diameter (6.0 mm) and the different radial injection angles (${\theta}_2=142^{\circ}$ and $148^{\circ}$), are manufactured. The distribution diameters with discharging distance are quantified by UL2167 test standard. The relations between discharging angle and droplet sizes, which are measured by the method of Helium-Neon laser equipment, are obtained by the empirical correlation as working pressure increase. Moreover, the extinction coefficient, which is major parameter of the radiative transport equation (RTE) is analyzed with variable droplet sizes. Thus, it is possible to opt the nozzle's shape by analyzing the relations of working pressure, spray distance, droplet size and fire characteristics at minimum allowable flow rate.

• Fire Protection Technology
• /
• s.20
• /
• pp.33-41
• /
• 1996

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.10 no.3
• /
• pp.60-66
• /
• 2011

In the present investigation, experimental studies were conducted on the fire suppression performance of twin-fluid water mist spray which is subjected to thermal radiation in a closed space. Downward-directed water-mist sprays, interacting with an under kerosene pool fire, were investigated in a test facility. The mass mean diameter of water-mist droplets were measured by PMAS under various flow conditions. The developed twin-fluid water mit spray nozzle satisfied the criteria of NFPA 750, Class 1. The mechanism of fire suppression by fine water mist was concluded to be the cooling of the fire surface which leads to the suppression of fuel evaporation. It was proved that the automatic twin-fluid water mist spray system under lower pressures could be applied to an industrial facilities.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 2001.11a
• /
• pp.271-279
• /
• 2001

• Journal of the Korea Institute of Building Construction
• /
• v.4 no.1
• /
• pp.97-103
• /
• 2004

In case of a fire in road or railway tunnel it is always necessary to keep the escape condition as good as possible. Most of the victims of major fires in tunnels are because they couldn't leave the tunnel in time and were trapped by smoke, or rescue teams couldn't reach the place of the accident due to low visibility and high temperature. In spring 2003 a comprehensive field experiment was undertaken in a large scaled tunnel in Youngin City to test the effectiveness of a new water spray curtain system, designed to the air qualify inside of a tunnel in case of fire during passenger's escape to safe routes, In order to control the smoke propagation, fixed water sprayed nozzles were used to make water curtain system, which can be installed or hanging water piping line below ceiling. The experiment was accompanied by an extensive measurement campaign in order to measure temperature dropping effect and flow conditions as well as CO concentration for various water sprayed curtains produced by sprinkler heads or water spray nozzle. Eventually comparison analysis were undertaken to investigate the performance of water curtains under fixed water pressure. Therefore most effective water curtain system was presented on the basis of water droplet size in long tunnel.

• Proceedings of the KSME Conference
• /
• 2003.04a
• /
• pp.1703-1708
• /
• 2003

The present study investigates the effect of injection angle of water mist on fire suppression characteristics by numerical simulation. In order to validate the temperature field by numerical simulation, the predicted results are compared with experimental data. It shows that the temperature difference between measurements and predictions are within $10^{\circ}C$ Numerical simulations of fire suppression are performed for 4 different injection angle($60^{\circ}$, $90^{\circ}$, $120^{\circ}$, and $180^{\circ}$). The grobal mean temperature over the fire compartment decrease with increasing of spray angle. The result shows that the heat transfer between droplets and gas phase are enhaced with the increasing of spray angle. Near the fire source, temperature field by the wide spray angle is slightly higher than that of narrow injection angle because of direct cooling of fire source.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.12 no.4
• /
• pp.341-347
• /
• 2010

The performance of water spray system installed to reduce risks of tunnel fire is investigated by a real tunnel fire test. In case of A class fire, Pool fire, and car fire, the nozzle of water spray has had a marvelous effect to reduce the temperature of hot smoke. And it is verified to have remarkable cooling effects when there is the air flow in a tunnel. Though this results, water spray system will be able to prevent a fire jump to decrease the air temperature in a tunnel and to protect tunnel facilities by the fire control.