Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Power Enhancement Potential of a Low-Temperature Heat-Source-Driven Rankine Power Cycle by Transcritical Operation

초월임계 운전에 의한 저온 열원 랭킨 동력 사이클의 출력 향상 가능성

  • Baik, Young-Jin (New and Renewable Energy Department, Korea Institute of Energy Research) ;
  • Kim, Min-Sung (New and Renewable Energy Department, Korea Institute of Energy Research) ;
  • Chang, Ki-Chang (New and Renewable Energy Department, Korea Institute of Energy Research) ;
  • Lee, Young-Soo (New and Renewable Energy Department, Korea Institute of Energy Research) ;
  • Ra, Ho-Sang (New and Renewable Energy Department, Korea Institute of Energy Research)
  • 백영진 (한국에너지기술연구원 신재생에너지연구본부) ;
  • 김민성 (한국에너지기술연구원 신재생에너지연구본부) ;
  • 장기창 (한국에너지기술연구원 신재생에너지연구본부) ;
  • 이영수 (한국에너지기술연구원 신재생에너지연구본부) ;
  • 나호상 (한국에너지기술연구원 신재생에너지연구본부)
  • Received : 2011.05.11
  • Accepted : 2011.07.29
  • Published : 2011.12.01
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Abstract

In this study, the power enhancement potential of a Rankine power cycle by transcritical operation was investigated by comparing the power of an HFC-134a subcritical cycle with that of an HFC-125 transcritical cycle, for a low-grade heat source with a temperature of about $100^{\circ}C$. For a fair comparison using different working fluids, each cycle was optimized by three design parameters from the viewpoint of power. In contrast to conventional approaches, the working fluid's heat transfer and pressure drop characteristics were considered in the present approach, with the aim of ensuring a more realistic comparison. The results showed that the HFC-125 transcritical cycle yields 9.4% more power than does the HFC-134a subcritical cycle under the simulation conditions considered in the present study.

본 연구에서는 $100^{\circ}C$의 저온 열원을 이용하여 구동되는 랭킨 동력 사이클에 대하여, HFC-134a를 이용한 아임계 운전을 할 경우의 출력과 HFC-125 를 이용한 초월임계 운전을 할 경우의 출력을 서로 비교함으로써, 초월임계 운전에 의한 출력 향상 가능성을 연구하였다. 서로 다른 두 사이클들의 출력을 공정하게 비교하기 위하여, 각 사이클들을 3 개의 설계인자를 이용하여 최적화 하였다. 이 때, 보다 현실적인 결과를 위하여 기존의 연구와는 달리, 열교환 과정에서 작동유체의 열전달 및 압력강하 특성을 고려하였다. 시뮬레이션 결과, HFC-125 초월임계 사이클의 출력이 HFC-134a 아임계 사이클의 출력에 비해 본 연구의 시뮬레이션 조건 하에서 9.4% 향상 될 수 있음을 보였다.

Keywords

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