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Characterizing wet and dry fluids in temperature-entropy diagrams

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  • White, J.A.
  • Velasco, S.

Abstract

In this work we show that the shape of the liquid-vapor saturation curve in a Tr−s∗ diagram (Tr = T/Tc and s∗ = s/R, with Tc the critical temperature, s the molar entropy and R the gas constant) for a given fluid is mainly governed by the acentric factor, ω, and the critical molar volume, vc, of the fluid. The study uses as reference the point M where the saturated vapor curve in the Tr−s∗ diagram changes its concavity, i.e. (d2s*g/dTr2)M=0. By analyzing the data provided by the National Standards and Technology (NIST) program RefProp 9.1 for 121 fluids, we find that, at this point, TMr≈0.81 and the slope ξM*=(ds*g/dTr)M is well correlated with vc, existing a threshold value vc,0≈0.22 m3 kmol−1 so that ξM*<0 (wet fluid) for vc < vc,0 and ξM*>0 (dry fluid) for vc > vc,0. This direct relation between vc and the wet or dry character of a fluid is the main result of the present work. Furthermore, the dimensionless vaporization entropy at the reference point M, ΔvsM*=sM*g−sM*l, increases in a nearly linear way with ω.

Suggested Citation

  • White, J.A. & Velasco, S., 2018. "Characterizing wet and dry fluids in temperature-entropy diagrams," Energy, Elsevier, vol. 154(C), pages 269-276.
    • Handle: RePEc:eee:energy:v:154:y:2018:i:c:p:269-276
    DOI: 10.1016/j.energy.2018.04.105
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    References listed on IDEAS

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    1. Bao, Junjiang & Zhao, Li, 2013. "A review of working fluid and expander selections for organic Rankine cycle," Renewable and Sustainable Energy Reviews, Elsevier, vol. 24(C), pages 325-342.
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    Cited by:

    1. 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.
    2. Zhang, Yi-Fan & Li, Ming-Jia & Ren, Xiao & Duan, Xin-Yue & Wu, Chia-Jung & Xi, Huan & Feng, Yong-Qiang & Gong, Liang & Hung, Tzu-Chen, 2022. "Effect of heat source supplies on system behaviors of ORCs with different capacities: An experimental comparison between the 3 kW and 10 kW unit," Energy, Elsevier, vol. 254(PB).
    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. Tsai, Yu-Chun & Feng, Yong-Qiang & Shuai, Yong & Lai, Jhao-Hong & Leung, Michael K.H. & Wei, Yen & Hsu, Hua-Yi & Hung, Tzu-Chen, 2023. "Experimental validation of a 0.3 kW ORC for the future purposes in the study of low-grade thermal to power conversion," Energy, Elsevier, vol. 285(C).
    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.

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