Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Characteristics of Thermodynamic Performance of Heat Exchanger in Organic Rankine Cycle Depending on Pinch Temperature Difference

유기랭킨사이클에서 핀치온도차의 변화에 따른 열교환기의 열역학적 성능특성

  • KIM, KYOUNG HOON (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • JUNG, YOUNG GUAN (Department of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • PARK, SANG HEE (Department of Mechanical Engineering, Kumoh National Institute of Technology)
  • 김경훈 (금오공과대학교 기계공학과) ;
  • 정영관 (금오공과대학교 기계공학과) ;
  • 박상희 (금오공과대학교 기계공학과)
  • Received : 2015.10.01
  • Accepted : 2015.12.30
  • Published : 2015.12.30
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Abstract

In this paper a performance analysis is carried out based on the first and second laws of thermodynamics for heat exchanger in organic Rankine cycle (ORC) for the recovery of low-temperature finite thermal energy source. In the analysis, effects of the selection of working fluid and pinch temperature difference are investigated on the performance of the heat exchanger including the effectiveness of the heat exchanger, exergy destruction, second-law efficiency, number of transfer unit (NTU), and pinch point. The temperature distribution are shown depending on the working fluids and the pinch temperature difference. The results show that the performance of the heat exchanger depends on the pinch temperature difference sensitively. As the pinch temperature increases, the exergy destruction in the evaporator increases but the effectiveness, second law efficiency and NTU decreases.

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