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Mapping of the Temperature–Entropy Diagrams of van der Waals Fluids

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  • Attila R. Imre

    (Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
    Department of Thermohydraulics, Centre for Energy Research, POB. 49, H-1525 Budapest, Hungary)

  • Réka Kustán

    (Department of Thermohydraulics, Centre for Energy Research, POB. 49, H-1525 Budapest, Hungary)

  • Axel Groniewsky

    (Department of Thermohydraulics, Centre for Energy Research, POB. 49, H-1525 Budapest, Hungary)

Abstract

The shape of the temperature vs. specific entropy diagram of a working fluid is very important to understanding the behavior of fluid during the expansion phase of the organic Rankine cycle or similar processes. Traditional wet-dry-isentropic classifications of these materials are not sufficient; several materials remain unclassified or misclassified, while materials listed in the same class might show crucial differences. A novel classification, based on the characteristic points of the T–s diagrams was introduced recently, listing eight different classes. In this paper, we present a map of these classes for a model material, namely, the van der Waals fluid in reduced temperature (i.e., reduced molecular degree of freedom) space; the latter quantity is related to the molar isochoric specific heat. Although van der Waals fluid cannot be used to predict material properties quantitatively, the model gives a very good and proper qualitative description. Using this map, some peculiarities related to T – s diagrams of working fluids can be understood.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1519-:d:336055
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    References listed on IDEAS

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    1. 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.
    2. 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.
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    7. 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.
    8. 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.
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    Cited by:

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