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

The Society of Naval Architects of Korea (대한조선학회)
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Determination of the Optimal Operating Condition of Dual Mixed Refrigerant Cycle of LNG FPSO Topside Liquefaction Process

LNG FPSO Topside의 액화 공정에 대한 이중 혼합 냉매 사이클의 최적 운전 조건 결정

  • Lee, Joon-Chae (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Cha, Ju-Hwan (Department of Ocean Engineering, Mokpo National University) ;
  • Roh, Myung-Il (School of Naval Architecture and Ocean Engineering, University of Ulsan) ;
  • Hwang, Ji-Hyun (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Lee, Kyu-Yeul (Department of Naval Architecture and Ocean Engineering, Research Institute of Marine Systems Engineering, Seoul National University)
  • 이준채 (서울대학교 조선해양공학과 대학원) ;
  • 차주환 (목포대학교 해양시스템공학과) ;
  • 노명일 (울산대학교 조선해양공학부) ;
  • 황지현 (서울대학교 조선해양공학과 대학원) ;
  • 이규열 (서울대학교 조선해양공학과 및 해양시스템공학연구소)
  • Received : 2011.06.29
  • Accepted : 2011.12.16
  • Published : 2012.02.20
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Abstract

In this study, the optimal operating conditions for the dual mixed refrigerant(DMR) cycle were determined by considering the power efficiency. The DMR cycle consists of compressors, heat exchangers, seawater coolers, valves, phase separators, tees, and common headers, and the operating conditions include the equipment's flow rate, pressure, temperature, and refrigerant composition per flow. First, a mathematical model of the DMR cycle was formulated in this study by referring to the results of a past study that formulated a mathematical model of the single mixed refrigerant(SMR) cycle, which consists of compressors, heat exchangers, seawater coolers, and valves, and by considering as well the tees, phase separators, and common headers. Finally, in this study, the optimal operating conditions from the formulated mathematical model was obtained using a hybrid optimization method that consists of the genetic algorithm(GA) and sequential quadratic programming(SQP). Moreover, the required power at the obtained conditions was decreased by 1.4% compared with the corresponding value from the past relevant study of Venkatarathnam.

Keywords

References

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