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Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a

Author

Listed:
  • Genxian Yang

    (Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology (KUST), Kunming 650093, China
    These authors contributed equally to this work.)

  • Junrui Tang

    (Power China Kunming Engineering Corporation Limited, Kunming 650051, China
    These authors contributed equally to this work.)

  • Zhouhang Li

    (National Local Joint Engineering Research Center of Energy Saving and Environmental Protection Technology in Metallurgy and Chemical Engineering Industry, Kunming University of Science and Technology (KUST), Kunming 650093, China)

Abstract

This work numerically studied the heat transfer and flow characteristics of supercritical R134a in horizontal pipes equipped with DDIR, considering variations in the rotation angle of DDIR. The aim is to improve the effects of the DDIR configuration on the heat transfer of supercritical flow. After validation with experimental data, the AKN model was employed to examine the effects of four sets of rotation angles (0°, 30°, 45°, and 60°) on the axial and circumferential heat transfer characteristics of DDIR horizontal tubes under the influence of strong ( q 1 / G 1 = 0.1 kJ/kg) and medium ( q 2 / G 2 = 0.056 kJ/kg) buoyancy. Results show that variations in the rotation angle do not induce significant alterations in the flow field, thus exerting minimal influence on the axial heat transfer characteristics. Meanwhile, the rotation angle determines the relative positioning of the circumferential inner wall temperatures and heat flux distribution, although the magnitude of this effect remains inconspicuous. The rotational angle parameter can be reasonably neglected in the future design and installation of heat exchangers.

Suggested Citation

  • Genxian Yang & Junrui Tang & Zhouhang Li, 2024. "Effect of Rotational Angle of Discrete Inclined Ribs on Horizontal Flow and Heat Transfer of Supercritical R134a," Energies, MDPI, vol. 17(7), pages 1-13, March.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:7:p:1631-:d:1366100
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    References listed on IDEAS

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    1. Teguh Hady Ariwibowo & Akio Miyara, 2020. "Thermal Characteristics of Slinky-Coil Ground Heat Exchanger with Discrete Double Inclined Ribs," Resources, MDPI, vol. 9(9), pages 1-17, August.
    2. Buonomano, Annamaria & Calise, Francesco & Palombo, Adolfo & Vicidomini, Maria, 2015. "Energy and economic analysis of geothermal–solar trigeneration systems: A case study for a hotel building in Ischia," Applied Energy, Elsevier, vol. 138(C), pages 224-241.
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