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<p>The supercritical CO<sub>2</sub> Brayton power cycles have garnered much research interest as an alternative to current fossil fuel-based power plants due to their promising techno-economic features. In the present study, energetic, exergetic, and exergoeconomic analysis of the dual reheat recompression sCO<sub>2</sub> Brayton cycle under varying cycle parameters, namely, turbine expansion ratio, compressor pressure ratio, and flue gas temperature. The exergoeconomic analysis reveals the case with a compressor pressure ratio of 4.5 with a maximum turbine inlet temperature of 620&#xa0;°C and a maximum cycle pressure of 334.5&#xa0;bar to be optimum. The first-law efficiency and exergetic efficiency for this case are found to be 50.74% and 47.49%, respectively. The exergetic analysis of the cycle components shows that the condenser and combustor together have a significant contribution to the exergy destruction, in the range of 75–80% of the total cycle’s exergy destruction. The maximum exergoeconomic factor among all of the cycle’s parametric cases studied is found to be 0.601, and the corresponding net power generation cost of the cycle under investigation is determined to be $0.169/kWh (2021$), which is currently not competitive with conventional electricity.</p>

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Energy, Exergy, and Exergoeconomic (3E) Analysis of Dual Reheat Recompression sCO2 Brayton Cycle

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Falgun Raval,
  • D. Ruben Sudhakar,
  • Sreekanth Manavalla,
  • M. Feroskhan

摘要

The supercritical CO2 Brayton power cycles have garnered much research interest as an alternative to current fossil fuel-based power plants due to their promising techno-economic features. In the present study, energetic, exergetic, and exergoeconomic analysis of the dual reheat recompression sCO2 Brayton cycle under varying cycle parameters, namely, turbine expansion ratio, compressor pressure ratio, and flue gas temperature. The exergoeconomic analysis reveals the case with a compressor pressure ratio of 4.5 with a maximum turbine inlet temperature of 620 °C and a maximum cycle pressure of 334.5 bar to be optimum. The first-law efficiency and exergetic efficiency for this case are found to be 50.74% and 47.49%, respectively. The exergetic analysis of the cycle components shows that the condenser and combustor together have a significant contribution to the exergy destruction, in the range of 75–80% of the total cycle’s exergy destruction. The maximum exergoeconomic factor among all of the cycle’s parametric cases studied is found to be 0.601, and the corresponding net power generation cost of the cycle under investigation is determined to be $0.169/kWh (2021$), which is currently not competitive with conventional electricity.