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Supercritical CO 2 Binary Mixtures for Recompression Brayton s-CO 2 Power Cycles Coupled to Solar Thermal Energy Plants

Author

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  • Paul Tafur-Escanta

    (Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, 2, 28006 Madrid, Spain)

  • Robert Valencia-Chapi

    (Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, 2, 28006 Madrid, Spain
    Facultad de Ingeniería en Ciencias Aplicadas, Universidad Técnica del Norte, Av. 17 de Julio, 5-21, Ibarra 100105, Ecuador
    Investigación, Desarrollo e Innovación Energética S.L. C/Oria, 16, 28002 Madrid, Spain)

  • Ignacio López-Paniagua

    (Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, 2, 28006 Madrid, Spain)

  • Luis Coco-Enríquez

    (Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, 2, 28006 Madrid, Spain)

  • Javier Muñoz-Antón

    (Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, 2, 28006 Madrid, Spain)

Abstract

In this work, an evaluation and quantification of the impact of using mixtures based on supercritical carbon dioxide “s-CO 2 ” (s-CO 2 /COS, s-CO 2 /H 2 S, s-CO 2 /NH 3 , s-CO 2 /SO 2 ) are made as a working fluid in simple and complex recompression Brayton s-CO 2 power cycle configurations that have pressure drops in their components. These cycles are coupled with a solar thermal plant with parabolic-trough collector (PTC) technology. The methodology used in the calculation performance is to establish values of the heat recuperator total conductance (UA total ) between 5 and 25 MW/K. The main conclusion of this work is that the cycle’s efficiency has improved due to using s-CO 2 mixtures as working fluid; this is significant compared to the results obtained using the standard fluid (pure s-CO 2 ). Furthermore, a techno-economic analysis is carried out that compares each configuration’s costs using pure s-CO 2 and a mixture of s-CO 2 /COS with a molar fraction (70/30), respectively, as working fluid where relevant results are obtained. These results show that the best configuration in terms of thermal efficiency and cost is the RCC-RH for pure sCO 2 with values of 41.25% and 2811 $/kWe, while for the mixture sCO 2 /COS, the RCC-2RH configuration with values of 45.05% and 2621 $/kWe is optimal. Using the mixture costs 6.75% less than if it is used the standard fluid (s-CO 2 ).

Suggested Citation

  • Paul Tafur-Escanta & Robert Valencia-Chapi & Ignacio López-Paniagua & Luis Coco-Enríquez & Javier Muñoz-Antón, 2021. "Supercritical CO 2 Binary Mixtures for Recompression Brayton s-CO 2 Power Cycles Coupled to Solar Thermal Energy Plants," Energies, MDPI, vol. 14(13), pages 1-27, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:13:p:4050-:d:588737
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    References listed on IDEAS

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    1. Guo, Jia-Qi & Li, Ming-Jia & Xu, Jin-Liang & Yan, Jun-Jie & Wang, Kun, 2019. "Thermodynamic performance analysis of different supercritical Brayton cycles using CO2-based binary mixtures in the molten salt solar power tower systems," Energy, Elsevier, vol. 173(C), pages 785-798.
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    1. Tafur-Escanta, Paul & López-Paniagua, Ignacio & Muñoz-Antón, Javier, 2023. "Thermodynamics analysis of the supercritical CO2 binary mixtures for Brayton power cycles," Energy, Elsevier, vol. 270(C).

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