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The effect of internal efficiency of expander on the working fluid selection.

Number: 1170

Author(s) : KUSTAN R., IMRE A. R., GRONIEWSKY A.

Summary

The final state of the expansion process has a crucial effect on the ORC design. If it ends in the dry vapour region, it requires isobar cooling for reaching the saturated vapour state, leading to smaller efficiency and higher investment and operating costs due to the extra recuperative heat exchanger. If however, the expansion terminates in the two-phase, wet region, the droplets may cause erosion problems, and they may decrease the net efficiency due to moisture loss. Hence it is essential to design an expansion, where the process’s initial and final states are both saturated states while all intermediate states are in the dry or slightly wet region. Therefore a method is proposed to determine the optimal working fluid for a real expander (characterized by isentropic efficiency) for a given heat source and heat sink with the simplest ORC layout.

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Pages: 7

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Details

  • Original title: The effect of internal efficiency of expander on the working fluid selection.
  • Record ID : 30027689
  • Languages: English
  • Source: IIR Rankine Conference 2020.
  • Publication date: 2020/07/31
  • DOI: http://dx.doi.org/10.18462/iir.rankine.2020.1170

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