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Effects of flow direction and thermal short-circuiting on the performance of small coaxial ground heat exchangers

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  • Zanchini, E.
  • Lazzari, S.
  • Priarone, A.

Abstract

The effects of flow direction and thermal short-circuiting on the performance of small-size coaxial ground heat exchangers, currently used in Northern Italy, are studied by finite-element simulations, performed through the software package COMSOL Multiphysics 3.4 (©Comsol, Inc.). The real 2-D axisymmetric unsteady heat conduction and convection problem is considered, both for winter and for summer working conditions. The flow in the outer annular passage is laminar in winter and turbulent in summer. The distribution of the fluid bulk temperature in the inner circular tube is determined by means of the weak form boundary condition available in COMSOL Multiphysics; the forced-convection heat transfer in the outer annular passage is simulated directly. Two Small Coaxial Ground Heat Exchangers (SCGHEs) with the same length (20m) but different cross-sections are examined; moreover, two values of the ground thermal conductivity, as well as two materials for the inner tube wall are considered. The results point out that the annulus-in flow direction (fluid inlet in the outer annular passage) is more efficient than the center-in flow direction (fluid inlet in the inner circular tube) and that, on account of the small length, the effect of thermal short-circuiting is not important for SCGHEs, especially if the annulus-in flow direction is employed.

Suggested Citation

  • Zanchini, E. & Lazzari, S. & Priarone, A., 2010. "Effects of flow direction and thermal short-circuiting on the performance of small coaxial ground heat exchangers," Renewable Energy, Elsevier, vol. 35(6), pages 1255-1265.
    • Handle: RePEc:eee:renene:v:35:y:2010:i:6:p:1255-1265
    DOI: 10.1016/j.renene.2009.11.043
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    References listed on IDEAS

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    1. Roth, P. & Georgiev, A. & Busso, A. & Barraza, E., 2004. "First in situ determination of ground and borehole thermal properties in Latin America," Renewable Energy, Elsevier, vol. 29(12), pages 1947-1963.
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    6. Quirosa, Gonzalo & Torres, Miguel & Becerra, José A. & Jiménez-Espadafor, Francisco J. & Chacartegui, Ricardo, 2023. "Energy analysis of an ultra-low temperature district heating and cooling system with coaxial borehole heat exchangers," Energy, Elsevier, vol. 278(PA).
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    9. Zanchini, Enzo & Lazzari, Stefano & Priarone, Antonella, 2012. "Long-term performance of large borehole heat exchanger fields with unbalanced seasonal loads and groundwater flow," Energy, Elsevier, vol. 38(1), pages 66-77.
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    11. Luo, Yongqaing & Guo, Hongshan & Meggers, Forrest & Zhang, Ling, 2019. "Deep coaxial borehole heat exchanger: Analytical modeling and thermal analysis," Energy, Elsevier, vol. 185(C), pages 1298-1313.
    12. Dai, Jiacheng & Li, Jingbin & Wang, Tianyu & Zhu, Liying & Tian, Kangjian & Chen, Zhaoting, 2023. "Thermal performance analysis of coaxial borehole heat exchanger using liquid ammonia," Energy, Elsevier, vol. 263(PE).
    13. Lee, Seokjae & Park, Sangwoo & Kang, Minkyu & Oh, Kwanggeun & Choi, Hangseok, 2022. "Effect of tube-in-tube configuration on thermal performance of coaxial-type ground heat exchanger," Renewable Energy, Elsevier, vol. 197(C), pages 518-527.
    14. Beier, Richard A. & Spitler, Jeffrey D., 2016. "Weighted average of inlet and outlet temperatures in borehole heat exchangers," Applied Energy, Elsevier, vol. 174(C), pages 118-129.
    15. Oh, Kwanggeun & Lee, Seokjae & Park, Sangwoo & Han, Shin-In & Choi, Hangseok, 2019. "Field experiment on heat exchange performance of various coaxial-type ground heat exchangers considering construction conditions," Renewable Energy, Elsevier, vol. 144(C), pages 84-96.
    16. Beier, Richard A. & Acuña, José & Mogensen, Palne & Palm, Björn, 2013. "Borehole resistance and vertical temperature profiles in coaxial borehole heat exchangers," Applied Energy, Elsevier, vol. 102(C), pages 665-675.
    17. Gordon, David & Bolisetti, Tirupati & Ting, David S-K. & Reitsma, Stanley, 2017. "A physical and semi-analytical comparison between coaxial BHE designs considering various piping materials," Energy, Elsevier, vol. 141(C), pages 1610-1621.
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    19. Acuña, José & Palm, Björn, 2013. "Distributed thermal response tests on pipe-in-pipe borehole heat exchangers," Applied Energy, Elsevier, vol. 109(C), pages 312-320.

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