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Numerical Study of Thermal-Hydraulic Performance of a New Spiral Z-Type PCHE for Supercritical CO 2 Brayton Cycle

Author

Listed:
  • Tingting Xu

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

  • Hongxia Zhao

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

  • Miao Wang

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

  • Jianhui Qi

    (School of Energy and Power Engineering, Shandong University, Jinan 250061, China)

Abstract

Printed circuit heat exchangers (PCHEs) have the characteristics of high temperature and high pressure resistance, as well as compact structure, so they are widely used in the supercritical carbon dioxide (S-CO2) Brayton cycle. In order to fully study the heat transfer process of the Z-type PCHE, a numerical model of traditional Z-type PCHE was established and the accuracy of the model was verified. On this basis, a new type of spiral PCHE (S-ZPCHE) is proposed in this paper. The segmental design method was used to compare the pressure changes under 5 different spiral angles, and it was found that increasing the spiral angle ? of the spiral structure will reduce the pressure drop of the fluid. The effects of different spiral angles on the thermal-hydraulic performance of S-ZPCHE were compared. The results show that the pressure loss of fluid is greatly reduced, while the heat transfer performance is slightly reduced, and it was concluded that the spiral angle of 20° is optimal. The local fluid flow states of the original structure and the optimal structure were compared to analyze the reason for the pressure drop reduction effect of the optimal structure. Finally, the performance of the optimal structure was analyzed under variable working conditions. The results show that the effect of reducing pressure loss of the new S-ZPCHE is more obvious in the low Reynolds number region.

Suggested Citation

  • Tingting Xu & Hongxia Zhao & Miao Wang & Jianhui Qi, 2021. "Numerical Study of Thermal-Hydraulic Performance of a New Spiral Z-Type PCHE for Supercritical CO 2 Brayton Cycle," Energies, MDPI, vol. 14(15), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4417-:d:599158
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    References listed on IDEAS

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    1. Ahn, Yoonhan & Lee, Jekyoung & Kim, Seong Gu & Lee, Jeong Ik & Cha, Jae Eun & Lee, Si-Woo, 2015. "Design consideration of supercritical CO2 power cycle integral experiment loop," Energy, Elsevier, vol. 86(C), pages 115-127.
    2. Hu, Lian & Chen, Deqi & Huang, Yanping & Li, Le & Cao, Yiding & Yuan, Dewen & Wang, Junfeng & Pan, Liangming, 2015. "Investigation on the performance of the supercritical Brayton cycle with CO2-based binary mixture as working fluid for an energy transportation system of a nuclear reactor," Energy, Elsevier, vol. 89(C), pages 874-886.
    3. 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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    Cited by:

    1. Wei-Hsin Chen & Yi-Wei Li & Min-Hsing Chang & Chih-Che Chueh & Veeramuthu Ashokkumar & Lip Huat Saw, 2022. "Operation and Multi-Objective Design Optimization of a Plate Heat Exchanger with Zigzag Flow Channel Geometry," Energies, MDPI, vol. 15(21), pages 1-22, November.
    2. Haicai Lyu & Han Wang & Qincheng Bi & Fenglei Niu, 2022. "Experimental Investigation on Heat Transfer and Pressure Drop of Supercritical Carbon Dioxide in a Mini Vertical Upward Flow," Energies, MDPI, vol. 15(17), pages 1-14, August.

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