Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Thermodynamic Efficiencies of Organic Rankine Cycles with a Feed Liquid Heater or Regenerator

급액가열기, 재생기를 적용한 유기랭킨사이클(ORC)의 열역학적 효율에 관한 해석적 연구

  • Park, Chang-Yong (Department of Mechanical Design and Automation Engineering, Seoul National University of Science and Technology) ;
  • Hong, Woong-Ki (Department of Mechanical Design and Automation Engineering, Seoul National University of Science and Technology) ;
  • Kim, Jung-Min (Department of Mechanical Design and Automation Engineering, Seoul National University of Science and Technology)
  • 박창용 (서울과학기술대학교 기계설계자동화공학부) ;
  • 홍웅기 (서울과학기술대학교 기계설계자동화공학부) ;
  • 김정민 (서울과학기술대학교 기계설계자동화공학부)
  • Received : 2011.07.25
  • Accepted : 2011.09.14
  • Published : 2011.10.10
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Abstract

A numerical study was performed for thermodynamic efficiencies of a basic ORC (Organic Rankine Cycle), ORC with a FLH (Feed Liquid Heater), and ORC with a regenerator. The efficiencies of the basic ORC were higher in the order of R113, R123, R245ca, and R245fa for its working fluids. It was confirmed that an optimal FLH pressure existed to maximize efficiency of the ORC with a FLH. A correlation was developed to predict the optimal FLH pressure as a function of evaporation and condensation pressure and its average absolute deviation was 0.505%. The efficiency enhancement of the basic ORC with a FLH was higher than that with a regenerator. It was presented that the basic ORC efficiency could be improved more than 10% by a FLH with $30^{\circ}C$ condensation and over $110^{\circ}C$ evaporation temperatures.

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References

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