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Normalized performance optimization of supercritical, CO2-based power cycles

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  • Battisti, Felipe G.
  • Cardemil, José M.
  • Miller, Francisco M.
  • da Silva, Alexandre K.

Abstract

This study considers the multivariable thermodynamic analysis and optimization of transcritical Rankine cycles operating with carbon dioxide as working fluid. Three dependent variables were used as figures of merit: the net power produced by the cycle, and its 1st and 2nd Law efficiencies, all calculated in absolute terms and per unit of global conductance (UA)Total, where (UA)Total accounts for the conductance of all heat exchangers used in the cycle. The key variables were the high pressure of the CO2 within the cycle and the temperature of the heat source, along with four different cycle configurations: (i) a basic power cycle, (ii) a cycle with a recuperator, (iii) a cycle with re-heating and (iv) a cycle with a recuperator and re-heating, namely, combined cycle. The optimization process relied on optimization routines and considered latent and sensible heat sources. This procedure was able to show that while the individually defined figures of merit mostly presented established trends, the normalized figures of merit (i.e., those defined per unit of UA) are highly dependent on the parameters considered and clearly show the existence of optimum values, which are a function of the cycle's configuration, figures of merit considered and operation parameters.

Suggested Citation

  • Battisti, Felipe G. & Cardemil, José M. & Miller, Francisco M. & da Silva, Alexandre K., 2015. "Normalized performance optimization of supercritical, CO2-based power cycles," Energy, Elsevier, vol. 82(C), pages 108-118.
    • Handle: RePEc:eee:energy:v:82:y:2015:i:c:p:108-118
    DOI: 10.1016/j.energy.2015.01.005
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    1. Battisti, Felipe G. & Cardemil, José M. & da Silva, Alexandre K., 2016. "A multivariable optimization of a Brayton power cycle operating with CO2 as working fluid," Energy, Elsevier, vol. 112(C), pages 908-916.
    2. Sánchez, Carlos J.N. & da Silva, Alexandre K., 2018. "Technical and environmental analysis of transcritical Rankine cycles operating with numerous CO2 mixtures," Energy, Elsevier, vol. 142(C), pages 180-190.
    3. Atif, Maimoon. & Al-Sulaiman, Fahad A., 2017. "Energy and exergy analyses of solar tower power plant driven supercritical carbon dioxide recompression cycles for six different locations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P1), pages 153-167.
    4. Wang, Lin & Pan, Liang-ming & Wang, Junfeng & Chen, Deqi & Huang, Yanping & Hu, Lian, 2019. "Investigation on the temperature sensitivity of the S-CO2 Brayton cycle efficiency," Energy, Elsevier, vol. 178(C), pages 739-750.
    5. Duniam, Sam & Veeraragavan, Ananthanarayanan, 2019. "Off-design performance of the supercritical carbon dioxide recompression Brayton cycle with NDDCT cooling for concentrating solar power," Energy, Elsevier, vol. 187(C).

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