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Simulation-Based Comparison Between the Thermal Behavior of Coaxial and Double U-Tube Borehole Heat Exchangers

Author

Listed:
  • Davide Quaggiotto

    (Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy)

  • Angelo Zarrella

    (Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy)

  • Giuseppe Emmi

    (Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy)

  • Michele De Carli

    (Department of Industrial Engineering—Applied Physics Section, University of Padova, Via Venezia 1, 35131 Padova, Italy)

  • Luc Pockelé

    (Red Srl, Viale dell’Industria 58/B, 35129 Padova, Italy)

  • Jacques Vercruysse

    (Geogreen sprl, Rue De Priesmont Marbais 63, 1495 Villers La Ville, Belgium)

  • Mario Psyk

    (Rehau AG & Co, Ytterbium 4, 91058 Erlangen-Eltersdorf, Germany)

  • Davide Righini

    (Hydra Srl, Via Imperiale 6, Traghetto di Argenta, 44011 Ferrara, Italy)

  • Antonio Galgaro

    (Department of Geoscience, University of Padova, Via Gradenigo 6, 35131 Padova, Italy)

  • Dimitrios Mendrinos

    (Centre for Renewable Energy Sources and Saving, Marathonos 19th km, 19009 Pikérmi, Greece)

  • Adriana Bernardi

    (CNR-ISAC, Corso Stati Uniti 4, 35127 Padova, Italy)

Abstract

In this study, the thermal behavior of the coaxial and double U borehole heat exchangers was investigated using numerical simulations in both the long- and short-term. As a reference for borehole heat exchanger specifications, the existing coaxial and double U probes of a geothermal heat pump installed within the Horizon 2020 research project named “Cheap GSHPs” were considered. Nine years of simulations revealed that when borehole heat exchangers are subjected to a balanced thermal load, and intermittent operating modes of the ground source heat pump system are set, the coaxial pipes’ configuration provides better thermal performance due to the higher thermal capacitance of the heat-carrier fluid and the lower borehole thermal resistance. The analysis was conducted considering two different types of ground with different thermal conductivity values. As result, the more conductive ground type highlights the higher yield of the coaxial probe.

Suggested Citation

  • Davide Quaggiotto & Angelo Zarrella & Giuseppe Emmi & Michele De Carli & Luc Pockelé & Jacques Vercruysse & Mario Psyk & Davide Righini & Antonio Galgaro & Dimitrios Mendrinos & Adriana Bernardi, 2019. "Simulation-Based Comparison Between the Thermal Behavior of Coaxial and Double U-Tube Borehole Heat Exchangers," Energies, MDPI, vol. 12(12), pages 1-18, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2321-:d:240612
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    References listed on IDEAS

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    1. Paolo Conti, 2016. "Dimensionless Maps for the Validity of Analytical Ground Heat Transfer Models for GSHP Applications," Energies, MDPI, vol. 9(11), pages 1-21, October.
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    Cited by:

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    6. Luka Boban & Dino Miše & Stjepan Herceg & Vladimir Soldo, 2021. "Application and Design Aspects of Ground Heat Exchangers," Energies, MDPI, vol. 14(8), pages 1-31, April.
    7. Joanna Piotrowska-Woroniak, 2021. "Determination of the Selected Wells Operational Power with Borehole Heat Exchangers Operating in Real Conditions, Based on Experimental Tests," Energies, MDPI, vol. 14(9), pages 1-21, April.
    8. Jia, G.S. & Ma, Z.D. & Xia, Z.H. & Zhang, Y.P. & Xue, Y.Z. & Chai, J.C. & Jin, L.W., 2022. "A finite-volume method for full-scale simulations of coaxial borehole heat exchangers with different structural parameters, geological and operating conditions," Renewable Energy, Elsevier, vol. 182(C), pages 296-313.
    9. Tomasz Sliwa & Kinga Jarosz & Marc A. Rosen & Anna Sojczyńska & Aneta Sapińska-Śliwa & Andrzej Gonet & Karolina Fąfera & Tomasz Kowalski & Martyna Ciepielowska, 2020. "Influence of Rotation Speed and Air Pressure on the Down the Hole Drilling Velocity for Borehole Heat Exchanger Installation," Energies, MDPI, vol. 13(11), pages 1-18, May.
    10. Hongkyo Kim & Yujin Nam & Sangmu Bae & Jae Sang Choi & Sang Bum Kim, 2020. "A Study on the Effect of Performance Factor on GSHP System through Real-Scale Experiments in Korea," Energies, MDPI, vol. 13(3), pages 1-18, January.
    11. Pokhrel, Sajjan & Sasmito, Agus P. & Sainoki, Atsushi & Tosha, Toshiyuki & Tanaka, Tatsuya & Nagai, Chiaki & Ghoreishi-Madiseh, Seyed Ali, 2022. "Field-scale experimental and numerical analysis of a downhole coaxial heat exchanger for geothermal energy production," Renewable Energy, Elsevier, vol. 182(C), pages 521-535.
    12. Aminhossein Jahanbin & Claudia Naldi & Enzo Zanchini, 2020. "Relation Between Mean Fluid Temperature and Outlet Temperature for Single U-Tube Boreholes," Energies, MDPI, vol. 13(4), pages 1-23, February.
    13. Tomasz Sliwa & Tomasz Kowalski & Dominik Cekus & Aneta Sapińska-Śliwa, 2021. "Research on Fresh and Hardened Sealing Slurries with the Addition of Magnesium Regarding Thermal Conductivity for Energy Piles and Borehole Heat Exchangers," Energies, MDPI, vol. 14(16), pages 1-13, August.
    14. Aminhossein Jahanbin & Giovanni Semprini & Andrea Natale Impiombato & Cesare Biserni & Eugenia Rossi di Schio, 2020. "Effects of the Circuit Arrangement on the Thermal Performance of Double U-Tube Ground Heat Exchangers," Energies, MDPI, vol. 13(12), pages 1-19, June.

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