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An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes

Author

Listed:
  • Boren Zheng

    (Department of Energy Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310027, China)

  • Jiacheng Wang

    (Department of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, 99 Songling Road, Qingdao 266061, China)

  • Yu Guo

    (Department of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, 99 Songling Road, Qingdao 266061, China)

  • David John Kukulka

    (Department of Mechanical Engineering Technology, State University of New York College at Buffalo, 1300 Elmwood Avenue, Buffalo, NY 14222, USA)

  • Weiyu Tang

    (Department of Energy Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310027, China)

  • Rick Smith

    (Rigidized Metals Corporation, Vipertex Division, 658 Ohio Street, Buffalo, NY 14203, USA)

  • Zhichuan Sun

    (AVIC Nanjing Engineering Institute of Aircraft Systems, Nanjing 211106, China
    Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration, Nanjing 211106, China)

  • Wei Li

    (Department of Energy Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310027, China)

Abstract

A study was carried out to determine in-tube evaporation and condensation performance of enhanced heat transfer tubes (EHT) using R410A, with the results being compared to a plain tube. The test tubes considered in the evaluation include: plain, herringbone (HB) and spiral (HX) microgrooves, herringbone dimple (HB/D), and hydrophobic herringbone (HB/HY). Experiments to evaluate the condensation were conducted at a saturation of 318 K, and at 279 K for evaporation. Mass flux (G) ranged between 40 to 230 kg m −2 s −1 . Condensed vapor mass decreased from 0.8 to 0.2; and the mass of vaporized vapor increases from 0.2 to 0.8; heat flux increased with G. Inlet and outlet two-phase flow patterns at 200 kg m −2 s −1 were recorded and analyzed. Enhanced tube heat transfer condensation performance (compared to a plain tube) increased in the range from 40% to 73%. The largest heat transfer increase is produced by the herringbone–dimple tube (HB/D). In addition to providing drainage, the herringbone groove also helps to lift the accumulated condensate to wet the surrounding wall. Evaporation thermal performance of the enhanced tubes are from 4% to 46% larger than that of smooth tube with the best performance being in the hydrophobic herringbone tube (HB/HY). This enhancement can be attributed to an increase in the number of nucleation sites and a larger heat transfer surface area. Evaporation and condensation correlations for heat transfer in smooth tubes is discussed and compared.

Suggested Citation

  • Boren Zheng & Jiacheng Wang & Yu Guo & David John Kukulka & Weiyu Tang & Rick Smith & Zhichuan Sun & Wei Li, 2021. "An Experimental Study of In-Tube Condensation and Evaporation Using Enhanced Heat Transfer (EHT) Tubes," Energies, MDPI, vol. 14(4), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:867-:d:495232
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    Citations

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    Cited by:

    1. Yu Gao & Hong Cheng & Wei Li & David John Kukulka & Rick Smith, 2022. "Condensation Flow and Heat Transfer Characteristics of R410A in Micro-Fin Tubes and Three-Dimensional Surface Enhanced Tubes," Energies, MDPI, vol. 15(8), pages 1-20, April.
    2. Xu Wang & David John Kukulka & Xiang-Zeng Liu & Wei Feng & Xiao-Bo Wang & Wei Li & Ze-Peng Wang, 2023. "Evaporation Flow Heat Transfer Characteristics of Stainless Steel and Copper Enhanced Tubes," Energies, MDPI, vol. 16(5), pages 1-19, February.

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