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Efficiency Analysis of the Main Components of a Vertical Closed-Loop System in a Borehole Heat Exchanger

Author

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  • Cristina Sáez Blázquez

    (Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain)

  • Arturo Farfán Martín

    (Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain)

  • Ignacio Martín Nieto

    (Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain)

  • Pedro Carrasco García

    (Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain)

  • Luis Santiago Sánchez Pérez

    (Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain)

  • Diego González-Aguilera

    (Department of Cartographic and Land Engineering, University of Salamanca, Higher Polytechnic School of Avila, Hornos Caleros 50, 05003 Avila, Spain)

Abstract

In vertical closed-loop systems, it is common to use single or double U-tube heat exchangers separated by longitudinal spacers. In addition, the helical-shaped pipe is another configuration that requires lower drilling lengths but it is less used. The aim of the present research is to study the influence of these components on the total efficiency of a borehole heat exchanger (BHE). Thus, the differences between using single/double U-tubes (with or without spacers) and helical pipes are analysed in terms of efficiency. Through different laboratory tests, a small vertical closed-loop system was simulated in order to analyse all these possible configurations. The grouting materials and the temperatures of the ground were modified at the same time in these tests. Regarding the heat exchange process between the ground and the heat carrier fluid, it must be highlighted that the best results were obtained for the helical-shaped pipe configuration. Some of the improvements offered by this heat exchanger typology with respect to the vertical configuration is that a lower drilling depth is required even it requires a larger diameter. This leads to significant economic savings in the performing drilling process. Finally, it is also worth noting the importance of using spacers in vertical U-tubes and that no improvements have been found regarding the use of single or double configuration of U-tubes. Thanks to the laboratory results derived from this study it is possible to establish the optimum behaviour pattern for the entire vertical closed-loop systems.

Suggested Citation

  • Cristina Sáez Blázquez & Arturo Farfán Martín & Ignacio Martín Nieto & Pedro Carrasco García & Luis Santiago Sánchez Pérez & Diego González-Aguilera, 2017. "Efficiency Analysis of the Main Components of a Vertical Closed-Loop System in a Borehole Heat Exchanger," Energies, MDPI, vol. 10(2), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:2:p:201-:d:89897
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    References listed on IDEAS

    as
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    Cited by:

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    2. 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).
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    4. Joanna Piotrowska-Woroniak, 2021. "Assessment of Ground Regeneration around Borehole Heat Exchangers between Heating Seasons in Cold Climates: A Case Study in Bialystok (NE, Poland)," Energies, MDPI, vol. 14(16), pages 1-32, August.
    5. Angelo Zarrella & Giuseppe Emmi & Samantha Graci & Michele De Carli & Matteo Cultrera & Giorgia Dalla Santa & Antonio Galgaro & David Bertermann & Johannes Müller & Luc Pockelé & Giulia Mezzasalma & D, 2017. "Thermal Response Testing Results of Different Types of Borehole Heat Exchangers: An Analysis and Comparison of Interpretation Methods," Energies, MDPI, vol. 10(6), pages 1-18, June.
    6. Wei-Tao Wu & Nadine Aubry & James F. Antaki & Mark L. McKoy & Mehrdad Massoudi, 2017. "Heat Transfer in a Drilling Fluid with Geothermal Applications," Energies, MDPI, vol. 10(9), pages 1-18, September.
    7. Luca Alberti & Adriana Angelotti & Matteo Antelmi & Ivana La Licata, 2017. "A Numerical Study on the Impact of Grouting Material on Borehole Heat Exchangers Performance in Aquifers," Energies, MDPI, vol. 10(5), pages 1-15, May.
    8. Javadi, Hossein & Mousavi Ajarostaghi, Seyed Soheil & Rosen, Marc A. & Pourfallah, Mohsen, 2019. "Performance of ground heat exchangers: A comprehensive review of recent advances," Energy, Elsevier, vol. 178(C), pages 207-233.
    9. 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.
    10. 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.
    11. Cristina Sáez Blázquez & Laura Piedelobo & Jesús Fernández-Hernández & Ignacio Martín Nieto & Arturo Farfán Martín & Susana Lagüela & Diego González-Aguilera, 2020. "Novel Experimental Device to Monitor the Ground Thermal Exchange in a Borehole Heat Exchanger," Energies, MDPI, vol. 13(5), pages 1-22, March.
    12. Adel Eswiasi & Phalguni Mukhopadhyaya, 2020. "Critical Review on Efficiency of Ground Heat Exchangers in Heat Pump Systems," Clean Technol., MDPI, vol. 2(2), pages 1-21, June.
    13. Joanna Piotrowska-Woroniak & Tomasz Szul & Grzegorz Woroniak, 2023. "Application of a Model Based on Rough Set Theory (RST) for Estimating the Temperature of Brine from Vertical Ground Heat Exchangers (VGHE) Operated with a Heat Pump—A Case Study," Energies, MDPI, vol. 16(20), pages 1-12, October.

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