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A study of organic working fluids on system efficiency of an ORC using low-grade energy sources

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Listed:
  • Hung, T.C.
  • Wang, S.K.
  • Kuo, C.H.
  • Pei, B.S.
  • Tsai, K.F.

Abstract

Rankine cycles using organic fluids (as categorized into three groups: wet, dry, and isentropic fluids) as working fluids in converting low-grade energy are investigated in this study. The main purpose is to identify suitable working fluids which may yield high system efficiencies in an organic Rankine cycle (ORC) system. Efficiencies of ORC systems are calculated based on an assumption that the inlet condition of the working fluid entering turbine is in saturated vapor phase. Parameters under investigation are turbine inlet temperature, turbine inlet pressure, condenser exit temperature, turbine exit quality, overall irrversibility, and system efficiency. The low-grade energy source can be obtained from a solar pond or/and an ocean thermal energy conversion (OTEC) system. Results indicate that wet fluids with very steep saturated vapor curves in T-s diagram have a better overall performance in energy conversion efficiencies than that of dry fluids. It can also be shown that all the working fluids have a similar behavior of the efficiency-condenser exit temperature relationship. Furthermore, an appropriate combination of solar energy and an ORC system with a higher turbine inlet temperature and a lower condenser temperature (as operated deeply under sea level) would provide an economically feasible and environment-friendly renewable energy conversion system.

Suggested Citation

  • Hung, T.C. & Wang, S.K. & Kuo, C.H. & Pei, B.S. & Tsai, K.F., 2010. "A study of organic working fluids on system efficiency of an ORC using low-grade energy sources," Energy, Elsevier, vol. 35(3), pages 1403-1411.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:3:p:1403-1411
    DOI: 10.1016/j.energy.2009.11.025
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    References listed on IDEAS

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