• 대한조선학회논문집
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• 제34권4호
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• pp.108-118
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• 1997

LNG운반선은 일반 상선과는 달리 경제성 관점에서의 적정 Boil-Off Rate(BOR)과 안전성 관점에서의 Steel Grade 결정을 위한 Cargo tank 온도분포 해석이 필수적이다. Membrane형 LNG선의 경우 이미 여러가지 해석이 수행된 바 있지만 대부분이 상당히 영향을 주는 부재들의 영향을 무시하였다. 본 연구에서는 이전의 연구에 더하여 온도 분포 해석에 가장 중요한 대류 열전달 계수의 산정에 더욱 정확한 상관식을 적용하였고 Longitudinal과 Floor등 주요 부재의 영향을 충분히 고려한 3차원 온도분포 해석과 BOR을 산정하는 program을 개발하였다. 또한 여러 가지 경우에 대해 타당성을 검토한 후 그 결과를 설계에 반영하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제29권6호
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• pp.612-617
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• 2005

• Journal of Advanced Marine Engineering and Technology
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• 제29권6호
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• pp.603-611
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• 2005

• Journal of Advanced Marine Engineering and Technology
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• 제29권4호
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• pp.341-348
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• 2005

• Journal of Advanced Marine Engineering and Technology
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• 제29권4호
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• pp.349-356
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• 2005

• Journal of Advanced Marine Engineering and Technology
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• 제29권4호
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• pp.357-362
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• 2005

• 한국해양공학회지
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• 제28권6호
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• pp.517-526
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• 2014

The leakage of cryogenic LNG through cracks in the insulation membrane of an LNG carrier causes the hull structure to experience a cold spot as a result of the heat transfer from the LNG. The hull structure will become brittle at this cold spot and the evaporated natural gas may potentially lead to a hazard because of its flammability. This paper presents a computational model for the LNG flow and heat diffusion in an LNG insulation panel subject to leakage. The temperature distribution in the insulation panel and the speed of gas diffusion through it are simulated to assess the safety level of an LNG carrier subject that experiences a leak. The behavior of the leaked LNG is modeled using a multiphase flow that considers the mixture of liquid and gas. The simulation model considers the phase change of the LNG, gas-liquid multiphase interactions in the porous media, and accompanying rates of heat transfer. It is assumed that the NO96-GW membrane storage is composed of glass wool and plywood for the numerical simulation. In the numerical simulation, the seepage, heat diffusion, and evaporation of the LNG are investigated. It is found that the diffusion speed of the leakage is very high to accelerate the evaporation of the LNG.

• 대한조선학회 특별논문집
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• 대한조선학회 2009년도 특별논문집
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• pp.6-17
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• 2009

The present paper addresses development of a GTT NO96 membrane type 170K m3 LNG carrier targeted to operate in moderate ice infested seas including Baltic Sea, Sakhalin port of Sea of Okhotsk, Murmansk port of Barents Sea, etc. Critical design issues are covered in detail to meet the requirements coming from the missioned operation conditions comprising low design ambient temperature, harsh wave conditions, stringent environmental protection policies, etc.

• 해양환경안전학회지
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• 제15권3호
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• pp.269-274
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• 2009

LNGC(Liquefied Natural Gas Carrier)의 역사는 1959년 $5,000m^3$ 급 LNG선 "Methane Pioneer"호를 시작으로 1969년에는 $71,500m^3$ 급, 1973년에는 Moss Type의 최초 LNG운반선 "Norman Lady($87,600m^3$)호, 1980년대 $125,000m^3$ 급을 시작으로 1990년대를 거처 $135,000m^3$ 급, 2007년 $210,000m^3$급 그리고 2008년에는 $266,000m^3$ 급의 초대형 액화천연가스 운반선이 출현하였다. 또한 2006년 11월에는 기존 내 외연 기관이 아닌 발전기 기동으로 Propeller를 움직이는 DFDE(Duel Fuel Diesel Electric)엔진, 육상의 Storage Tank를 생략한 기화설비를 갖춘 LNG-RV(Re-gasification Vessel)와 주 기관은 Slow Diesel을 택하고, 운항 중 발생하는 BOG(Boil Off Gas)를 재액화시키는 설비를 갖춘 DRL(Diesel Re-Liquefaction)선박 및 해상 LNG 생산 저장시설인 LNG-FPSO(Floating Production and Storage Offshore), 그리 고 해상 LNG 인수기지 역할을 하는 LNG-FSRU(Floating Store and Re-gasification Unit) 등이 개발되었다. 이 논문에서는 LNG Project, 전 세계 에너지 시장과 LNGC의 발전 추세에 대하여 다루었다.

• 한국유체기계학회 논문집
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• 제11권2호
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• pp.13-19
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• 2008

Butterfly valves are widely used as control valves for industrial process. For the definition of optimum configuration of the valve, wide range of related studies has been actively conducted in the case of working fluids of water or air under the normal temperature. Recently, internal flow and performance characteristics of cryogenic butterfly valve for LNG carrier take a growing interest in the field of research and development. Therefore, present study is aimed to investigate the internal flow and performance characteristics of the cryogenic butterfly valve because the study result for the valve can be hardly found at present. Part 1 of this paper describes the study result of a butterfly valve model under the condition of the normal temperature. Succeeding Part 2 of this paper will describe the internal flow characteristics of a cryogenic butterfly valve for LNG carrier. The results of Part 1 show that pressure loss coefficients and flow rate coefficients obtained by the present experiment and CFD analysis agree well each other. Moreover, internal flow visualization for the valve by CFD analysis and PIV measurement have revealed complicated flow patterns of the internal flow field in detail.