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Mixtures of SF6–CO2 as working fluids for geothermal power plants

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  • Yin, Hebi
  • Sabau, Adrian S.
  • Conklin, James C.
  • McFarlane, Joanna
  • Qualls, A. Lou

Abstract

In this paper, supercritical/transcritical thermodynamic cycles using mixtures of SF6–CO2 as working fluids were investigated for geothermal power plants. The system of equations that described the thermodynamic cycle was solved using a Newton–Raphson method. This approach allows a high computational efficiency even when thermophysical properties of the working fluid depend strongly on the temperature and pressure. The thermophysical properties of the mixtures were obtained from National Institute of Standards and Technology (NIST) REFPROP software and constituent cubic equations. The local heat transfer coefficients in the heat exchangers were calculated based on the local properties of the working fluid, geothermal brine, and cooling water. The heat exchanger areas required were calculated. Numerical simulation results presented for different cycle configurations were used to assess the effects of the SF6 fraction in CO2, brine temperature, and recuperator size on the cycle thermal efficiency, and size of heat exchangers for the evaporator and condenser. For working fluids with SF6, concentrations of 15 and 20mol% were found to yield the highest Brayton and Rankine cycle efficiencies, respectively.

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  • Yin, Hebi & Sabau, Adrian S. & Conklin, James C. & McFarlane, Joanna & Qualls, A. Lou, 2013. "Mixtures of SF6–CO2 as working fluids for geothermal power plants," Applied Energy, Elsevier, vol. 106(C), pages 243-253.
    • Handle: RePEc:eee:appene:v:106:y:2013:i:c:p:243-253
    DOI: 10.1016/j.apenergy.2013.01.060
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