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New Knowledge on the Performance of Supercritical Brayton Cycle with CO 2 -Based Mixtures

Author

Listed:
  • Aofang Yu

    (School of Energy Science and Engineering, Central South University, Changsha 410083, China)

  • Wen Su

    (School of Energy Science and Engineering, Central South University, Changsha 410083, China)

  • Li Zhao

    (Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University), MOE, Tianjin 300072, China)

  • Xinxing Lin

    (Institute of Science and Technology, China Three Gorges Corporation, Beijing 100038, China)

  • Naijun Zhou

    (School of Energy Science and Engineering, Central South University, Changsha 410083, China)

Abstract

As one of the promising technologies to meet the increasing demand for electricity, supercritical CO 2 (S-CO 2 ) Brayton cycle has the characteristics of high efficiency, economic structure, and compact turbomachinery. These characteristics are closely related to the thermodynamic properties of working fluid. When CO 2 is mixed with other gas, cycle parameters are determined by the constituent and the mass fraction of CO 2 . Therefore, in this contribution, a thermodynamic model is developed and validated for the recompression cycle. Seven types of CO 2 -based mixtures, namely CO 2 -Xe, CO 2 -Kr, CO 2 -O 2 , CO 2 -Ar, CO 2 -N 2 , CO 2 -Ne, and CO 2 -He, are employed. At different CO 2 mass fractions, cycle parameters are determined under a fixed compressor inlet temperature, based on the maximization of cycle efficiency. Cycle performance and recuperators’ parameters are comprehensively compared for different CO 2 -based mixtures. Furthermore, in order to investigate the effect of compressor inlet temperature, cycle parameters of CO 2 -N 2 are obtained under four different temperatures. From the obtained results, it can be concluded that, as the mass fraction of CO 2 increases, different mixtures show different variations of cycle performance and recuperators’ parameters. In generally, the performance order of mixtures coincides with the descending or ascending order of corresponding critical temperatures. Performance curves of these considered mixtures locate between the curves of CO 2 -Xe and CO 2 -He. Meanwhile, the curves of CO 2 -O 2 and CO 2 -N 2 are always closed to each other at high CO 2 mass fractions. In addition, with the increase of compressor inlet temperature, cycle performance decreases, and more heat transfer occurs in the recuperators.

Suggested Citation

  • Aofang Yu & Wen Su & Li Zhao & Xinxing Lin & Naijun Zhou, 2020. "New Knowledge on the Performance of Supercritical Brayton Cycle with CO 2 -Based Mixtures," Energies, MDPI, vol. 13(7), pages 1-23, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1741-:d:341746
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    References listed on IDEAS

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    3. 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.
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    5. Liang, Yaran & Lin, Xinxing & Su, Wen & Xing, Lingli & Zhou, Naijun, 2023. "Thermal-economic analysis of a novel solar power tower system with CO2-based mixtures at typical days of four seasons," Energy, Elsevier, vol. 276(C).

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