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Approximating the Temperature–Entropy Saturation Curve of ORC Working Fluids From the Ideal Gas Isobaric Heat Capacity

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  • Juan A. White

    (Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
    IUFFyM, Universidad de Salamanca, 37008 Salamanca, Spain
    These authors contributed equally to this work.)

  • Santiago Velasco

    (Departamento de Física Aplicada, Universidad de Salamanca, 37008 Salamanca, Spain
    IUFFyM, Universidad de Salamanca, 37008 Salamanca, Spain
    These authors contributed equally to this work.)

Abstract

Recently, we proposed an approximate expression for the liquid–vapor saturation curves of pure fluids in a temperature–entropy diagram that requires the use of parameters related to the molar heat capacity along the vapor branch of the saturation curve. In the present work, we establish a connection between these parameters and the ideal-gas isobaric molar heat capacity. The resulting new approximation yields good results for most working fluids in Organic Rankine Cycles, improving the previous approximation for very dry fluids. The ideal-gas isobaric molar heat capacity can be obtained from most Thermophysical Properties databases for a very large number of substances for which the present approximation scheme can be applied.

Suggested Citation

  • Juan A. White & Santiago Velasco, 2019. "Approximating the Temperature–Entropy Saturation Curve of ORC Working Fluids From the Ideal Gas Isobaric Heat Capacity," Energies, MDPI, vol. 12(17), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3266-:d:260738
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    References listed on IDEAS

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    4. Attila R. Imre & Réka Kustán & Axel Groniewsky, 2020. "Mapping of the Temperature–Entropy Diagrams of van der Waals Fluids," Energies, MDPI, vol. 13(6), pages 1-15, March.

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