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Theoretical analysis of a novel PCHE with enhanced rib structures for high-power supercritical CO2 Brayton cycle system based on solar energy

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  • Han, Zengxiao
  • Guo, Jiangfeng
  • Huai, Xiulan

Abstract

A printed circuit heat exchanger (PCHE) is one of the most significant components in the supercritical CO2 (SCO2) Brayton cycle system based on concentrated solar power, whose performance significantly affects the efficiency and compactness of the system. To improve the performance of PCHE with semicircular-straight channels, rib structures placed on the top flat wall of the semicircular channel are proposed, which are achieved by the double sides etched heat transfer plates, and the effects of the distributions of rib structures on the performance of channels are also investigated. The thermal-hydraulic performance of the conventional semicircular channel and the semicircular channel with different rib structures are compared. The results indicate that rib structures lead to an apparent increase of turbulence kinetic energy in channels, and improve the synergy between velocity and temperature gradient fields, leading to the heat transfer enhancement. Among the channels with different rib structures, the comprehensive performance of the semicircular channel with the spacing distribution of short rib structures (channel DR3) is the best, which is relatively 19.3–19.8% higher than that of the conventional semicircular channel. When the channel DR3 is adopted in PCHE, the effectiveness of PCHE could reach 98.4–98.7%, the efficiency of the SCO2 Brayton cycle system based on solar power could be increased by 15.3%, and the compactness of the system could be improved by 3.8%. This present work is of great significance for deepening the understanding of PCHE heat transfer mechanism and performance optimisation, as well as improving the overall performance and compactness of large-scale SCO2-based power systems.

Suggested Citation

  • Han, Zengxiao & Guo, Jiangfeng & Huai, Xiulan, 2023. "Theoretical analysis of a novel PCHE with enhanced rib structures for high-power supercritical CO2 Brayton cycle system based on solar energy," Energy, Elsevier, vol. 270(C).
    • Handle: RePEc:eee:energy:v:270:y:2023:i:c:s0360544223003225
    DOI: 10.1016/j.energy.2023.126928
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    References listed on IDEAS

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    1. Liu, Guangxu & Huang, Yanping & Wang, Junfeng & Liu, Ruilong, 2020. "A review on the thermal-hydraulic performance and optimization of printed circuit heat exchangers for supercritical CO2 in advanced nuclear power systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
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    4. Singh, Rajinesh & Kearney, Michael P. & Manzie, Chris, 2013. "Extremum-seeking control of a supercritical carbon-dioxide closed Brayton cycle in a direct-heated solar thermal power plant," Energy, Elsevier, vol. 60(C), pages 380-387.
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    2. Li, Qian & Zhan, Qi & Yu, Shipeng & Sun, Jianchuang & Cai, Weihua, 2023. "Study on thermal-hydraulic performance of printed circuit heat exchangers with supercritical methane based on machine learning methods," Energy, Elsevier, vol. 282(C).

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