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Evaluation of the Effect of Anti-Corrosion Coatings on the Thermal Resistance of Ground Heat Exchangers for Shallow Geothermal Applications

Author

Listed:
  • Gianluca Cadelano

    (Institute of Atmospheric Sciences and Climate (CNR-ISAC), National Research Council of Italy, 35127 Padua, Italy)

  • Alessandro Bortolin

    (Institute of Atmospheric Sciences and Climate (CNR-ISAC), National Research Council of Italy, 35127 Padua, Italy)

  • Giovanni Ferrarini

    (Institute of Construction Technologies (CNR-ITC), National Research Council of Italy, 35127 Padua, Italy)

  • Paolo Bison

    (Institute of Construction Technologies (CNR-ITC), National Research Council of Italy, 35127 Padua, Italy)

  • Giorgia Dalla Santa

    (Department of Geosciences, University of Padua, 35131 Padua, Italy)

  • Eloisa Di Sipio

    (Department of Geosciences, University of Padua, 35131 Padua, Italy)

  • Adriana Bernardi

    (Institute of Atmospheric Sciences and Climate (CNR-ISAC), National Research Council of Italy, 35127 Padua, Italy)

  • Antonio Galgaro

    (Department of Geosciences, University of Padua, 35131 Padua, Italy)

Abstract

The materials and the technology used to build the ground heat exchangers significantly affect the heat transfer performance of a geothermal system, in addition to the local geological and hydrogeological context. Among expense items such as the coupled heat pumps and the applied drilling technology, the heat exchangers play a key role in the shallow geothermal market. For this reason, they are usually made with plastic. Metal tubes are not widely used because of corrosion issues, which can compromise the reliability of the system over time. According to best practices, metal is an unfavorable choice if the pipes are not made of corrosion resistant alloys, such as stainless steel, but the overall performance is strongly related to the heat transfer efficiency. In this study, laser-flash technique is applied on carbon steel samples with anti-corrosion coatings and on corrosion resistant materials (stainless steel grades used for pipes), thus, allowing the comparison of their thermophysical properties. These properties are used to evaluate each solution in terms of thermal resistance. This study demonstrates that there are no particular corrosion resistant steel pipe configurations that are thermally favorable over others in a critical way.

Suggested Citation

  • Gianluca Cadelano & Alessandro Bortolin & Giovanni Ferrarini & Paolo Bison & Giorgia Dalla Santa & Eloisa Di Sipio & Adriana Bernardi & Antonio Galgaro, 2021. "Evaluation of the Effect of Anti-Corrosion Coatings on the Thermal Resistance of Ground Heat Exchangers for Shallow Geothermal Applications," Energies, MDPI, vol. 14(9), pages 1-12, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2586-:d:547478
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    References listed on IDEAS

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    1. Badenes, Borja & Sanner, Burkhard & Mateo Pla, Miguel Ángel & Cuevas, José Manuel & Bartoli, Flavia & Ciardelli, Francesco & González, Rosa M. & Ghafar, Ali Nejad & Fontana, Patrick & Lemus Zuñiga, Le, 2020. "Development of advanced materials guided by numerical simulations to improve performance and cost-efficiency of borehole heat exchangers (BHEs)," Energy, Elsevier, vol. 201(C).
    2. 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.
    3. 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.
    4. 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.
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