Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Scale Effect Analysis of LNG Cargo Containment System Using a Thermal Resistance Network Model

열저항 네트워크 모델을 이용한 LNG 화물창 Scale Effect 분석

  • Hwalong You (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Taehoon Kim (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Changhyun Kim (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Minchang Kim (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Myungbae Kim (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Yong-Shik Han (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Le-Duy Nguyen (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Kyungyul Chung (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Byung-Il Choi (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM)) ;
  • Kyu Hyung Do (Innovative Energy Machinery Research Division, Korea Institute of Machinery and Materials (KIMM))
  • 유화롱 (한국기계연구원 고효율에너지기계연구부) ;
  • 김태훈 (한국기계연구원 고효율에너지기계연구부) ;
  • 김창현 (한국기계연구원 고효율에너지기계연구부) ;
  • 김민창 (한국기계연구원 고효율에너지기계연구부) ;
  • 김명배 (한국기계연구원 고효율에너지기계연구부) ;
  • 한용식 (한국기계연구원 고효율에너지기계연구부) ;
  • 듀이 (한국기계연구원 고효율에너지기계연구부) ;
  • 정경열 (한국기계연구원 고효율에너지기계연구부) ;
  • 최병일 (한국기계연구원 고효율에너지기계연구부) ;
  • 도규형 (한국기계연구원 고효율에너지기계연구부)
  • Received : 2023.03.28
  • Accepted : 2023.05.18
  • Published : 2023.08.20
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Abstract

In the present work, the scale effect on the Boil-Off Rate (BOR) was investigated based on an analytical method to systematically evaluate the thermal performance of a Liquefied Natural Gas (LNG) Cargo Containment System (CCS). A two-dimensional thermal resistance network model was developed to accurately estimate the heat ingress into the CCS from the outside. The analysis was performed for the KC-1 LNG membrane tank under the IGC and USCG design conditions. The ballast compartment of both the LNG tank and cofferdam was divided into six sections and a thermal resistance network model was made for each section. To check the validity of the developed model, the analysis results were compared with those from existing literature. It was shown that the BOR values under the IGC and USCG design conditions were agreed well with previous numerical results with a maximum error of 1.03% and 0.60%, respectively. A SDR, the scale factor of the LNG CCS was introduced and the BOR, air temperature of the ballast compartment, and the surface temperature of the inner hull were obtained to examine the influence of the SDR on the thermal performance. Finally, a correlation for the BOR was proposed, which could be expressed as a simple formula inversely proportional to the SDR. The proposed correlation could be utilized for predicting the BOR of a full-scale LNG tank based on the BOR measurement data of lab-scale model tanks.

Keywords

Acknowledgement

본 연구는 한국기계연구원 기본사업(액체수소 공급시스템 핵심 기자재 개발) 및 산업통상자원부와 한국산업기술진흥원의 LNG 극저온 화물창 소재 및 구조체의 성능평가 기술개발사업(과제번호: P0018490)의 지원을 받아 수행되었습니다.

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