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A rigorous and accurate approach for predicting the wet-to-dry transition for working mixtures in organic Rankine cycles

Author

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  • Albornoz, Jorge
  • Mejía, Andrés
  • Quinteros-Lama, Héctor
  • Garrido, José Matías

Abstract

Working fluids play a relevant role in solvent screening, which is required to analyze the performance of cool and power generation. In this contribution, a solidly thermodynamic-based criteria has been developed in order to provide a rational guide, capable of qualitatively and quantitatively predicting the effects of adding solvents. The latter with the aim of modify the performance of a given fluid by the addition of key agents, thus seeking to induce or inhibit some desirable or undesirable properties. This development is rigorous and applicable directly to any model through systematic applications of Legendre transforms. Both, slope and curvature of the temperature vs. entropy boundary have been analytically developed and applied to binary mixtures. Moreover, a dimensionless function which depends only on configurational properties is presented. Foremost, this theoretical framework was applied to van der Waals fluids due to their qualitative accuracy. For this approach, the behavior of simple and azeotropic mixtures is shown and an untold phenomenon constituted by multiple isentropic transitions for a single mixture has also been described. For quantitative descriptions, PC-SAFT EoS has been selected in its simplest form in order to render the behavior of mixtures composed by linear hydrocarbons and fluorocarbons.

Suggested Citation

  • Albornoz, Jorge & Mejía, Andrés & Quinteros-Lama, Héctor & Garrido, José Matías, 2018. "A rigorous and accurate approach for predicting the wet-to-dry transition for working mixtures in organic Rankine cycles," Energy, Elsevier, vol. 156(C), pages 509-519.
    • Handle: RePEc:eee:energy:v:156:y:2018:i:c:p:509-519
    DOI: 10.1016/j.energy.2018.05.074
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    Citations

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    Cited by:

    1. González, Johan & Llovell, Fèlix & Garrido, José Matías & Quinteros-Lama, Héctor, 2023. "A study of the optimal conditions for organic Rankine cycles coupled with vapour compression refrigeration using a rigorous approach based on the Helmholtz energy function," Energy, Elsevier, vol. 285(C).
    2. Attila R. Imre & Réka Kustán & Axel Groniewsky, 2019. "Thermodynamic Selection of the Optimal Working Fluid for Organic Rankine Cycles," Energies, MDPI, vol. 12(10), pages 1-15, May.
    3. 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.
    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.
    5. Jovell, Daniel & Gonzalez-Olmos, Rafael & Llovell, Fèlix, 2022. "A computational drop-in assessment of hydrofluoroethers in Organic Rankine Cycles," Energy, Elsevier, vol. 254(PB).
    6. Gábor Györke & Axel Groniewsky & Attila R. Imre, 2019. "A Simple Method of Finding New Dry and Isentropic Working Fluids for Organic Rankine Cycle," Energies, MDPI, vol. 12(3), pages 1-11, February.
    7. González, Johan & Llovell, Fèlix & Garrido, José Matías & Quinteros-Lama, Héctor, 2022. "A rigorous approach for characterising the limiting optimal efficiency of working fluids in organic Rankine cycles," Energy, Elsevier, vol. 254(PA).

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