• Title/Summary/Keyword: 화재성장률

Search Result 22, Processing Time 0.023 seconds

Study on the Application of Cone Calorimeter for Building of Data-Bases for Fire Safety (화재안전 데이터베이스 구축을 위한 콘칼로리미터의 활용성 연구)

  • Hong, Hwa-Young;Lee, Jong-Sung;Park, Su-Jin;Kwon, In-Kyu
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
    • /
    • 2011.04a
    • /
    • pp.325-329
    • /
    • 2011
  • Fire has developed from the inter-action of heat at the early state and it is very difficult to estimate the magnitude of the fire. Cone Calorimeter can obtain the important material properties from the exposed part of it. It can be contained that ignition, loss of mass, heat release rate, smoke generation, and gas analysis. The purpose of this study is emphasize on the properties of structural steels in terms of physical, mechanical and that will be important way to build the databases of fire safety.

  • PDF

A Numerical Study on the Effect of Volume Change in a Closed Compartment on Maximum Heat Release Rate (밀폐된 구획실의 체적변화가 최대 열발생률에 미치는 영향에 관한 수치해석 연구)

  • Yun, Hong-Seok;Nam, Dong-Gun;Hwang, Cheol-Hong
    • Fire Science and Engineering
    • /
    • v.31 no.5
    • /
    • pp.19-27
    • /
    • 2017
  • The effects of changes in area and location of fire source, fire growth rate, and volume of compartment on the major fire characteristics, including heat release rate, in closed compartment fires were examined. To this end, a fire simulation using Fire Dynamics Simulator (FDS) was performed for ISO 9705 room with a closed opening. As main result, it was found that the changes in the area and location of fire source did not significantly affect the thermal and chemical characteristics inside the compartment, such as maximum heat release rate, total heat release, maximum temperature at upper layeras well as species concentrations. However, increasinthe fire growth rate and volume of compartment resulted in increase of the maximum heat release rate and total heat release, decrease in the limiting oxygen concentration and increase in the maximum CO concentration. Finally, a methodology for the application of fire growth curves to closed compartment fires was proposed by deriving the correlation of the maximum heat release rate expressed as a function of the fire growth rate and the volume ratio of compartment based on the ISO 9705 room.

Evaluation of Design Fire Curves for Single Combustibles in a Cinema Complex (복합영상관 단일 가연물의 디자인 화재곡선 평가)

  • Jang, Hyo-Yeon;Hwang, Cheol-Hong;Oh, Chang Bo;Nam, Dong-Gun
    • Fire Science and Engineering
    • /
    • v.34 no.3
    • /
    • pp.18-27
    • /
    • 2020
  • An actual fire test was performed on single combustibles placed in a local cinema complex, and quantitative differences in the maximum heat release rate (HRR) and fire growth rate were investigated based on the design fire curve methods (i.e., the general and 2-stage methods). In terms of combustible use and fire load, a total of 12 combustibles were selected, classified into cinema lounge and movie theater. It was found that the maximum HRR and fire growth rate determined using the two-stage method were quantitatively different from those of the general method. The application of the two-stage method, which can be used to determine the fire growth rate of the initial fire stage more precisely, could be useful in accurately predicting the activation time of fire detectors and fire-extinguishing facilities, as well as the available safe egress time (ASET) and required safe egress time (RSET).

Measurements of the Heat Release Rate and Fire Growth Rate of Combustibles for the Performance-Based Design - Focusing on the Combustibles in Residential and Office Spaces (성능위주설계를 위한 가연물의 열발생률 및 화재성장률 측정 -주거 및 사무공간 가연물을 중심으로)

  • Nam, Dong-Gun;Hwang, Cheol-Hong
    • Fire Science and Engineering
    • /
    • v.31 no.2
    • /
    • pp.29-36
    • /
    • 2017
  • The design fire based on the heat release rate (HRR) of combustibles can significantly affect the assessment of fire safety in the performance-based design (PBD). In the present PBD, however, limited information in the foreign literature has been used without further verification due to the lack of fire information in domestic combustibles. The objective of this study is to provide information on the HRR and fire growth rate for various combustibles in residential and office spaces. To end this, the fire experiments were carried out with single and multiple combustibles. The peak HRR of combustibles used in the present study had a range of 36 kW~1,092 kW. The fire growth rates were also $0.003kW/s^2{\sim}0.0287kW/s^2$ and $0.003kW/s^2{\sim}0.0838kW/s^2$ for the residential and office spaces, respectively. In particular, a sofa had the highest fire risk in terms of the peak HRR and fire growth rate. Finally, a methodology for calculating the peak HRR in a space was proposed through correlation analysis between the peak HRR and exposed surface of various combustibles.

A Forecast Study on the Fire Growth Rate and Investigation of Combustible for Fire Safety Design in Building (건축물 화재안전설계를 위한 주요가연물조사 및 화재성장율 예측에 관한 연구)

  • Seo, Dong-Goo;Kim, Dong-Eun;Kim, Bong-Chan;Kwon, Young-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2012.05a
    • /
    • pp.133-135
    • /
    • 2012
  • The Fire growth rate(kW/s2) is significant impact on initial fire behavior in fire safety design of buildings. As a result of domestic existing combustibles, this study analyzed considering matters in techniques for calculating caloric values, and then made an investigation sheet. By utilizing written combustion sheets, the study could suggest a standard model at common houses and dense ones after getting caloric value information in dense ones. As a result, fire growth rate is experiment 1(0.01), experiment 2(0.0048), FDS(0.0072), MATSUYAMA equation(0.0144).

  • PDF

A Study on the Characteristics of FDS Heat Release Rate Predictions for Fire involving Solid Combustible Materials in a Closed Compartment (밀폐된 구획 내 복합소재 고체 가연물의 연소시 열방출률의 FDS 예측 특성)

  • Hong, Ter-Ki;Roh, Beom-Seok;Park, Seul-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.21 no.11
    • /
    • pp.349-356
    • /
    • 2020
  • The heat release rate (HRR) and fire growth rate of fire for the solid combustibles consisting of multi-materials was measured through the ISO 9705 room corner test, and the computational analysis in a closed compartment was performed to simulate a fire using the heat release rate prediction model provided by a Fire Dynamics Simulator (FDS). The method of predicting the heat release rate provided by the FDS was divided into a simple model and a pyrolysis model. Each model was applied and computational analysis was performed under the same conditions. As the solid combustible consisting of multi-materials, a cinema chair composed mostly of PU foam, PP, and steel was selected. The simple model was over-predicted compared to the predicted heat release rate and fire growth rate using the pyrolysis model in a closed compartment.

Heat Release Characteristics of Typical Live Fire Load in Large Bookstore (대형서점 적재가연물의 초기 연소발열성상)

  • Nam, Dong-Gun
    • Fire Science and Engineering
    • /
    • v.25 no.2
    • /
    • pp.88-94
    • /
    • 2011
  • Heat release characteristics of live fire load are an important parameter for performance oriented fire safety design of a building. While investigations have been carried out on the fire load and its burning behavior in office, residential and commercial buildings and so on, little effort has been paid for the rational treatment of fire load in bookstore. In this report, burning behavior of typical combustible objects in bookstore are studied by measuring heat release rates of bookshelf with book. Based on the results, it has reviewed fire safety when a fire accident occurs on the large bookstore and suggested peak heat release rate per burning surface, fire growth rate, etc of the live fire load required for fire safety design in bookstore.

The Study on Real Scale Fire Test for Fire Growth of Office (사무용 공간의 화재 성장 예측을 위한 실물화재실험)

  • Kweon, Oh-Sang;Kim, Heung-Youl;Kim, Jung-Hyun
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
    • /
    • 2012.04a
    • /
    • pp.278-281
    • /
    • 2012
  • 사무공간의 화재성상을 예측하기 위해 화재하중 $25kg/m^2$ 값을 적용하여 $2.4(L){\times}3.6(W){\times}2.4(H)\;m$ 크기의 Mock-up 화재실험을 진행하였다. 화재실험은 실물화재실험 장비인 LSC(Large Scale Calorimeter)에서 실시하였으며, 열방출률 및 질량감소율을 측정하였다. 실물화재실험 시작 후 약 1110 초에 플래시오버가 발생하였으며, 최대 열발출률은 1241.1 KW로 측정되었고 질량은 초기 219 kg에서 102 kg로 감소하였다.

  • PDF

Measurements of the Heat Release Rate and Fire Growth Rate of Combustibles for the Performance-Based Design - Focusing on the Plastic Fire of Commercial Building (성능위주설계를 위한 가연물의 열발생률 및 화재성장률 측정 - 판매시설의 플라스틱 화재를 중심으로 -)

  • Jang, Hyo-Yeon;Nam, Dong-Gun
    • Fire Science and Engineering
    • /
    • v.32 no.6
    • /
    • pp.55-62
    • /
    • 2018
  • To improve the prediction result with enhanced reliability of domestic Performance-Based Design (PBD), actual scale fire tests were carried out on products made of plastics from sales facility combustibles. The commercial buildings were separated into single and multiple combustibles for the experimentation of fire spread caused by the sales shelves where the various combustible materials are displayed. A according to the maximum heat release rate, exposed area and weight of the combustible material, the results revealed a linear relationship of as 93% and 89%. In addition, analysis of the gas concentrations for various combustibles showed that $CO_2$ has a linear relationship, whereas the CO concentration indicated exponential function. These results can be applied to reliable fire source information in PBD of plastic fire source in commercial buildings. This may be applied as fire source information representative of a plastic fire in commercial buildings through additional experiment using the area of the shelf in actual commercial buildings.

Characteristics of Heat Release Rate Predictions of Fire by a Fire Dynamics Simulator for Solid Combustible Materials (복합소재 고체 가연물의 화재 시 발생되는 열방출률의 FDS 예측 특성)

  • Nam, Dong-Gun;Hong, Ter-Ki;Ryu, Myung-Ho;Park, Seul-Hyun
    • Fire Science and Engineering
    • /
    • v.34 no.4
    • /
    • pp.22-28
    • /
    • 2020
  • The heat release rate (HRR) of fire for solid combustibles, consisting of multi-materials, was measured using the ISO 9705 room corner test, and a computational analysis was conducted to simulate the fire using an HRR prediction model that was provided by a fire dynamics simulator (FDS). As the solid combustible consisted of multi-materials, a cinema chair composed primarily of PU foam, PP, and steel was employed. The method for predicting the HRR provided by the FDS can be categorized into a simple model and a pyrolysis model. Because each model was applied and computational analysis was conducted under the same conditions, the HRR and fire growth rate predicted by the pyrolysis model had good agreement with the results obtained using the ISO 9705 room corner test.