Analysis of Heat Release Rate with Various Diameter of Heptane Pool Fire Using Large Scale Cone Calorimeter

You, Woo Jun; Nam, Dong-Gun; Youm, Moon Cheon; Kim, Sung‐Chan; Ryou, Hong Sun

doi:10.7731/kifse.2014.28.5.001

Cited by 7 publications

(4 citation statements)

References 12 publications

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“…Thornton 지수법에 관한 연구가 발표되면서 화재 열 방출률을 산출하기 위한 방법으로 널리 활용되고 있는 실험설비이다 (1) 칼로리미 . 터의 주요 설계인자는 배기팬의 용량 덕트 와 후드 , (duct) (hood) 의 형상 등으로 배기가스의 유량과 후드에서 포집된 연소생성 물 중에서 산소 농도가 감소되는 정도에 따라서 열 방출률을 산출하는 원리이다 (2)(3)(4) 따라서 주변의 공기와 화재로부터 발생 . 된 연소생성물을 정량적으로 예측하여 후드에서의 포집 용량 을 산출하는 것은 칼로리미터를 설계하는데 매우 중요한 연구 중 하나이다 (5,6) .…”

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Investigating the Heat Release Rate of Large-scale Calorimeter using FDS Analysis

You¹,

Park²,

Kim³

et al. 2023

Fire Sci. Eng.

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This study aims to identify the key design factors of a large-scale calorimeter and evaluate the accuracy of the simulation results using the Fire Dynamics Simulator (FDS) program. The design specifications of a domestic large-scale calorimeter were analyzed to determine the modeling and input conditions for the simulation. The simulation results of temperature, mass flow rate, and oxygen concentration reduction inside the duct were compared with the experimental results for heptane pool fires with diameters of 1.1 m, 1.24 m, and 1.44 m, respectively. To validate the accuracy of the simulation results, the deviations, calculated using FDS for the heat release rate as the experimental value, were found to be 19.12%, 11.86%, and 0.22% for temperature, mass flow rate, and oxygen concentration, respectively. Ultimately, the results of the heat release rate inside the duct obtained by the oxygen consumption method with FDS were found to be consistent with the experimental value, within 2.58%. However, the deviation of oxygen concentration is reduced as the deviation of mass flow rate increases for a constant heat release rate. This implies that for more accurate analysis, the heat loss and shape factors in the duct should be considered.

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Investigating the Heat Release Rate of Large-scale Calorimeter using FDS Analysis

You¹,

Park²,

Kim³

et al. 2023

Fire Sci. Eng.

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“…석하게 되면 연구 결과의 타당성을 확보할 수 없을 뿐만 아니라 가연물의 화재 특성에 관한 잘못된 기초 자료가 구 축되어 성능위주 설계 등과 같은 응용분야에서의 활용성이 낮아질 수 있다 (4,10) . 이러한 이유로 신뢰성 있는 발열량 산 출에 관한 연구는 국내뿐만 아니라 국외에서도 매우 중요 한 연구 중 하나로 인식되고 있다 (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11) .…”

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“…여기서, 와   는 각각 레이놀즈 수정계수와 덕트 중심에서의 유속(m/s)을 의미하며, 레이놀즈 수가 3,800 이 상인 경우 가 1.08로 가정할 수 있기 때문에 평균속 도에 대한 덕트 중심부의 비를 의미하는 형상인자(  )를 상 수로 가정한 경우 질량유량의 관계식은 식 (9)와 같다 (2,4) .…”

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Fundamental Experiment on the Flow Characteristics inside the Exhaust Duct of Cone Calorimeter

Shin¹,

You²

2019

Fire Sci. Eng

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In this study, the mass flow rate of the heat release rate equation, which is the major factor of the oxygen consumption method, was analyzed for the fundamental investigation of the cone-calorimeter (5 m length and 0.3 m diameter). The shapes of a completely empty inside, 3 mm pore diameter mesh and pore diameter 10 mm honeycomb with 0.76 porosity were constructed using the cone-calorimeter. To calculate the mass flow rate, four bi-directional probes and thermocouples were installed in a uniform position in the vertical direction of flow. The velocity gradient and flow perturbation were measured from the increase in Reynolds number. As the flow capacity increased, the speed gradient increased in all three shapes relative to the turbulence intensity. In addition, the deviation of extended uncertainty to the mass flow was completely low in the order of empty space, mesh (  = 3 mm) and honeycomb (  = 10 mm and = 0.76) at the 95% confidence level. The results can be used in designs to improve the flow stability of the cone calorimeter.

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“…서 론 실규모급 화재 현상을 재현하기 위해서는 주변 환경 인 자를 고려한 초기 조건과 가연물의 열화학적 특성 그리고 화재시나리오 등이 정확하게 고려되어야 한다 (1)(2) . 하지만, 초기 조건은 외부 온도 및 풍속에 따라서 쉽게 변할 수 있 고, 가연물의 정확한 성분을 고려한 열화학적 상태량을 적 용하기 어려운 단점이 있으며, 화재 확산이 예기치 못하게 변동되는 경우 화재시나리오를 분석하기 위한 비용과 시간 이 많이 소모될 수 있다 (1) . 생하게 된다.…”

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Investigation of the Relationship Between Wall Thermal Conductivity and Inner Room Temperature in Compartment Fires

You¹,

Ko²

2018

Fire Sci Eng

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In this study, the relations of the wall thermal conductivity and surface temperature in a compartment fire are investigated using Buckingham Pi theorem. The dimensionless parameters of the previous study are analyzed in order to correlate the dimensionless groups of the heat release rate, the thermal conductivity, the volume of compartment and the convective heat transfer coefficient. In addition the reduced scale of compartment, which has 1/6 size of ISO 9705 Room Corner Tester, is manufactured and the oxygen concentration and the maximum temperature in the space are measured for the gasoline pool fire (10 cm×10 cm, 15 cm×15 cm and 20 cm×20 cm). Finally, the criterion of the wall temperature increase are suggested in accordance with the thermal conductivity and the convective heat transfer coefficient. In addition, the dimensionless empirical equation using Buckingham Pi theorem considering the heat release rate are presented suggested. The results of this study will be useful especially for the fire phenomenon investigation of the wall thermal conductivity coefficient and shape in the compartment space.

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Analysis of Heat Release Rate with Various Diameter of Heptane Pool Fire Using Large Scale Cone Calorimeter

Cited by 7 publications

References 12 publications

Investigating the Heat Release Rate of Large-scale Calorimeter using FDS Analysis

Investigating the Heat Release Rate of Large-scale Calorimeter using FDS Analysis

Fundamental Experiment on the Flow Characteristics inside the Exhaust Duct of Cone Calorimeter

Investigation of the Relationship Between Wall Thermal Conductivity and Inner Room Temperature in Compartment Fires

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