• Fire Science and Engineering
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• v.34 no.3
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• pp.28-34
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• 2020

In this study, an ISO 5660-1 cone calorimeter experiment was conducted to examine the effects of changes in flow and thermal thickness around solid combustibles on heat release rate characteristics. Polymethyl methacrylate (PMMA) is a solid combustible material that does not generate char during the combustion reaction. Hence, it was selected for the experiment, and the thermal penetration depth was calculated to distinguish the thermal thickness of PMMA. Furthermore, the thermal decomposition characteristics were analyzed by measuring the heat release rate measured during the combustion of PMMA. This was performed after generating the forced flow around the combustibles by setting the duct flow of the cone calorimeter to 12, 24, and 40 L/s. The results confirmed that the thermal release rate of the thermally thin combustible material was not significantly affected by the change in the surrounding flow. Hence, the thermally thick combustible material was significantly affected by the change in the flow rate.

• Journal of the Korean Applied Science and Technology
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• v.29 no.2
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• pp.268-277
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• 2012

The thermal decomposition characteristic of waste PVC wires has been studied by using TGA and fixed-bed reactor. The experimental conditions of decomposition temperatures, air flow rates and weight ratio of CaO/PVC were considered in this work. To verify the effectiveness of CaO addition to remove HCl and toxic gases generated from thermal decomposition of PVC wire, the gaseous products obtained from the thermal decomposition of PVC were analyzed by GC/MS(Gas Chromatograph and Mass Spectrometry). To investigate the effect of CaO in thermal decomposition of PVC, liquid products were also analyzed by GC/MS. And the effect of decomposition temperature, air flow rate and CaO/ PVC weight ratio on the yield of liquid, gas and residue fraction have been also studied. From this work, it was found that the removal amount of HCl generated from thermal decomposition of PVC increased with increase of CaO addition.

• The Korean Journal of Petroleum Geology
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• v.10 no.1_2 s.11
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• pp.1-9
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• 2004

A total of 17 exploratory wells were drilled from the Block VI-1 and recently commercial gas field was discovered in the Ulleung Basin. Thermal maturity of organic matter in the sediments from the drilling wells were evaluated for the characterization of the petroleum system of the basin. Level of thermal maturation of organic matter is different depending on the area to area. The top of oil window is located at about 800 m in the Dolgorae 5 area, and it is relatively deeper in both western and northern areas. It seems that thermal maturity of organic matter reached present stage before tectonism in the deformed zone 2, whereas thermal maturation continued after tectonism in other zones.

• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.104.2-104
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• 2002

• Proceedings of the Korean Ceranic Society Conference
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• 2003.10a
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• pp.161.2-161
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• 2003

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2016.05a
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• pp.257-258
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• 2016

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.19 no.5
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• pp.287-294
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• 1990

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 1998.11a
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• pp.47-52
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• 1998

최근에 세라믹-금속 접합, 열차폐코팅(Thermal Barrier Coating), 마모저항코팅등 이종재료접합의 이용이 급증하고 있다. 열차폐코팅의 경우, 고온환경쪽에 세라믹을 배치하여 내열성을 부여하고, 냉각환경쪽은 금속재료를 사용하여 열전도성과 기계적 강도를 부여한다. 이 때 두 재료의 경계부에서는 열적, 기계적 특성 차이로 인하여 제조과정이나 사용중에 열적, 기계적 부하에 의하여 내부잔류응력이 생기게 되며, 이는 재료의 강도, 파괴특성에 많은 영향을 미치기 때문에 잔류응력의 감소기술이 중요시되고 있다. (중략)

• Transactions of the Korean Society of Mechanical Engineers
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• v.9 no.6
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• pp.810-820
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• 1985

배기 decoupling chamber룰 갖고 있는 맥동 연소 급수가열기에 대한 수학적인 모델링과 관련된 컴퓨터 시뮬레이션을 하였고, 이 때 계에 대한 맥동 현상과 관련된 열적 및 동적 특성을 고려 였다. 시뮬레이션결과 시동기간에 대한 계의 각 부분에서 일어나는 열전달, 압력 및 온도를 구 였고 또한 해석의 제한성과 개선의 필요성을 논의하였다. 이 연구에서 얻어진 결과는 도관에서 맥동에 의한 대류열전달을 예측하기 위한 모델을 세우는데 활용될 수 있다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.04a
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• pp.31-36
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• 2010

원전 방화지역에서 화재가 발생할 경우 케이블 고장으로 인한 기기의 오동작 및 안전정지 기능에 미치는 영향 평가가 필요하다. 본 논문에서 FDS의 THIEF 모델을 이용하여 환기조건 및 열발생율 변화에 따른 원전 안전정지 케이블의 열적 특성을 분석하였다.