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Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System

Received: 8 July 2019     Accepted: 6 August 2019     Published: 19 August 2019
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Abstract

This article presents an investigation of a low curvature coiled tube with double discrete inclined ribs for an application to ground heat exchanger used in ground heat pump systems. Computational fluid dynamics is employed to analyze the heat transfer and fluid flow with several ribs. The analysis performs detailed study involving flow behavior, pressure drop, heat transfer rate, wall heat flux, absolute vorticity flux for a range of ribs height (0.45 mm, 0.75 mm, and 1 mm) and flowrate (ranging from 6 L/min to 10 L/min) on curvature of coil 2.22 m-1. COP improvement factor, which is a function of heat transfer enhancement and pressure loss increase, is evaluated. The increasing of ribs height can deviate secondary flow, which contributes to heat transfer and pressure drop enhancement. In the case of higher ribs, circumferential heat flux distribution tends to be more fluctuated. The heat flux distribution also becomes smaller with the increasing of axial distance. The COP improvement factor significantly improves with the increase of ribs height. On the other hand, the COP Improvement factor tends to decrease with the increase in flow rate. The application of ribs in a low curvature coil is attractive and has the potential for Slinky-coil ground heat exchangers.

Published in International Journal of Sustainable and Green Energy (Volume 8, Issue 3)
DOI 10.11648/j.ijrse.20190803.12
Page(s) 56-64
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Double Discrete Inclined Ribs, Low Curvature Coil, Ground Source Heat Exchangers

References
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Cite This Article
  • APA Style

    Teguh Hady Ariwibowo, Akio Miyara, Keishi Kariya. (2019). Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System. International Journal of Sustainable and Green Energy, 8(3), 56-64. https://doi.org/10.11648/j.ijrse.20190803.12

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    ACS Style

    Teguh Hady Ariwibowo; Akio Miyara; Keishi Kariya. Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System. Int. J. Sustain. Green Energy 2019, 8(3), 56-64. doi: 10.11648/j.ijrse.20190803.12

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    AMA Style

    Teguh Hady Ariwibowo, Akio Miyara, Keishi Kariya. Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System. Int J Sustain Green Energy. 2019;8(3):56-64. doi: 10.11648/j.ijrse.20190803.12

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  • @article{10.11648/j.ijrse.20190803.12,
      author = {Teguh Hady Ariwibowo and Akio Miyara and Keishi Kariya},
      title = {Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System},
      journal = {International Journal of Sustainable and Green Energy},
      volume = {8},
      number = {3},
      pages = {56-64},
      doi = {10.11648/j.ijrse.20190803.12},
      url = {https://doi.org/10.11648/j.ijrse.20190803.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijrse.20190803.12},
      abstract = {This article presents an investigation of a low curvature coiled tube with double discrete inclined ribs for an application to ground heat exchanger used in ground heat pump systems. Computational fluid dynamics is employed to analyze the heat transfer and fluid flow with several ribs. The analysis performs detailed study involving flow behavior, pressure drop, heat transfer rate, wall heat flux, absolute vorticity flux for a range of ribs height (0.45 mm, 0.75 mm, and 1 mm) and flowrate (ranging from 6 L/min to 10 L/min) on curvature of coil 2.22 m-1. COP improvement factor, which is a function of heat transfer enhancement and pressure loss increase, is evaluated. The increasing of ribs height can deviate secondary flow, which contributes to heat transfer and pressure drop enhancement. In the case of higher ribs, circumferential heat flux distribution tends to be more fluctuated. The heat flux distribution also becomes smaller with the increasing of axial distance. The COP improvement factor significantly improves with the increase of ribs height. On the other hand, the COP Improvement factor tends to decrease with the increase in flow rate. The application of ribs in a low curvature coil is attractive and has the potential for Slinky-coil ground heat exchangers.},
     year = {2019}
    }
    

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  • TY  - JOUR
    T1  - Consideration of Double Discrete Inclined Ribs in Low Curvature Coil for GSHP System
    AU  - Teguh Hady Ariwibowo
    AU  - Akio Miyara
    AU  - Keishi Kariya
    Y1  - 2019/08/19
    PY  - 2019
    N1  - https://doi.org/10.11648/j.ijrse.20190803.12
    DO  - 10.11648/j.ijrse.20190803.12
    T2  - International Journal of Sustainable and Green Energy
    JF  - International Journal of Sustainable and Green Energy
    JO  - International Journal of Sustainable and Green Energy
    SP  - 56
    EP  - 64
    PB  - Science Publishing Group
    SN  - 2575-1549
    UR  - https://doi.org/10.11648/j.ijrse.20190803.12
    AB  - This article presents an investigation of a low curvature coiled tube with double discrete inclined ribs for an application to ground heat exchanger used in ground heat pump systems. Computational fluid dynamics is employed to analyze the heat transfer and fluid flow with several ribs. The analysis performs detailed study involving flow behavior, pressure drop, heat transfer rate, wall heat flux, absolute vorticity flux for a range of ribs height (0.45 mm, 0.75 mm, and 1 mm) and flowrate (ranging from 6 L/min to 10 L/min) on curvature of coil 2.22 m-1. COP improvement factor, which is a function of heat transfer enhancement and pressure loss increase, is evaluated. The increasing of ribs height can deviate secondary flow, which contributes to heat transfer and pressure drop enhancement. In the case of higher ribs, circumferential heat flux distribution tends to be more fluctuated. The heat flux distribution also becomes smaller with the increasing of axial distance. The COP improvement factor significantly improves with the increase of ribs height. On the other hand, the COP Improvement factor tends to decrease with the increase in flow rate. The application of ribs in a low curvature coil is attractive and has the potential for Slinky-coil ground heat exchangers.
    VL  - 8
    IS  - 3
    ER  - 

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Author Information
  • Graduate School of Science and Engineering, Saga University, Saga, Japan

  • Department of Mechanical Engineering, Saga University, Saga, Japan

  • Department of Mechanical Engineering, Saga University, Saga, Japan

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