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Optimization of a Hybrid Recompression Supercritical Carbon Dioxide–Organic Rankine Cycle Regenerative Combined System

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  • Shengya Hou

    (School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200000, China)

  • Shuaiwei Yang

    (School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200000, China)

  • Qiguo Yang

    (School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200000, China)

Abstract

To efficiently recover waste heat from gas turbines, a hybrid recompression supercritical carbon dioxide (SCO 2 )–organic Rankine cycle (ORC) regenerative combined system is proposed. The ORC employs a mixed working fluid to enhance thermodynamic matching. Thermodynamic, compactness, and economic models are established to analyze the influence of key operating parameters on system performance. Based on parametric analysis, decision variables are identified and used for single-objective and multi-objective optimizations of system performance metrics. Results show that increasing the split ratio in the recompression cycle improves thermodynamic performance but simultaneously increases both heat transfer area per unit output power ( APR ) and the levelized electricity cost ( LEC ). In the ORC, the temperature glide during evaporation and condensation of the mixed working fluid enables better thermal match with the heat source and sink, thereby reducing the required heat transfer area and associated cost rate. Under multi-objective optimization targeting APR and LEC , the optimal decision variables are determined as 560 °C, 4.2, 0.71, 44 °C, and 0.71, respectively.

Suggested Citation

  • Shengya Hou & Shuaiwei Yang & Qiguo Yang, 2025. "Optimization of a Hybrid Recompression Supercritical Carbon Dioxide–Organic Rankine Cycle Regenerative Combined System," Energies, MDPI, vol. 18(20), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:20:p:5493-:d:1774175
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    References listed on IDEAS

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    1. Maria Alessandra Ancona & Michele Bianchi & Lisa Branchini & Andrea De Pascale & Francesco Melino & Antonio Peretto & Noemi Torricelli, 2021. "Systematic Comparison of ORC and s-CO 2 Combined Heat and Power Plants for Energy Harvesting in Industrial Gas Turbines," Energies, MDPI, vol. 14(12), pages 1-22, June.
    2. Sahu, Mithilesh Kumar & Sanjay,, 2017. "Comparative exergoeconomics of power utilities: Air-cooled gas turbine cycle and combined cycle configurations," Energy, Elsevier, vol. 139(C), pages 42-51.
    3. Wang, Xurong & Dai, Yiping, 2016. "Exergoeconomic analysis of utilizing the transcritical CO2 cycle and the ORC for a recompression supercritical CO2 cycle waste heat recovery: A comparative study," Applied Energy, Elsevier, vol. 170(C), pages 193-207.
    4. Carcasci, Carlo & Ferraro, Riccardo & Miliotti, Edoardo, 2014. "Thermodynamic analysis of an organic Rankine cycle for waste heat recovery from gas turbines," Energy, Elsevier, vol. 65(C), pages 91-100.
    5. Akbari, Ata D. & Mahmoudi, Seyed M.S., 2014. "Thermoeconomic analysis & optimization of the combined supercritical CO2 (carbon dioxide) recompression Brayton/organic Rankine cycle," Energy, Elsevier, vol. 78(C), pages 501-512.
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