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Innovative Solutions for Improving the Heat Exchange in Closed-Loop Shallow Geothermal Systems

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  • Giovanni Floridia

    (Dipartimento di Scienze Biologiche, Geologiche e Ambientali–Sezione di Scienze della Terra, Università degli Studi di Catania, Corso Italia 57, 95125 Catania, Italy)

  • Federica Blandini

    (Dipartimento di Scienze Biologiche, Geologiche e Ambientali–Sezione di Scienze della Terra, Università degli Studi di Catania, Corso Italia 57, 95125 Catania, Italy)

  • Salvatore Iuculano

    (Dipartimento di Scienze Biologiche, Geologiche e Ambientali–Sezione di Scienze della Terra, Università degli Studi di Catania, Corso Italia 57, 95125 Catania, Italy
    TEKNE S.R.L. Viale Scala Greca, 328, 96100 Siracusa, Italy)

  • Giuseppe M. Belfiore

    (EarTherm S.R.L-Via Giorgio Arcoleo 4/B, 95030 Gravina di Catania, Italy)

  • Marco Viccaro

    (Dipartimento di Scienze Biologiche, Geologiche e Ambientali–Sezione di Scienze della Terra, Università degli Studi di Catania, Corso Italia 57, 95125 Catania, Italy
    EarTherm S.R.L-Via Giorgio Arcoleo 4/B, 95030 Gravina di Catania, Italy
    Istituto Nazionale di Geofisica e Vulcanologia–Sezione di Catania, Osservatorio Etneo, Piazza Roma 2, 95125 Catania, Italy)

Abstract

Thermal conductivity, hydraulics properties and potential use in low-enthalpy geothermal applications of single and double U geothermal probes enhanced with carbon fibre are discussed in this work. Although the efficiency of a shallow geothermal installation is chiefly based on chemical and physical characteristics of rocks and hydrogeological aspects of the subsurface, the total heat extracted from the subsoil also depends on the intrinsic thermal characteristics of probes. New configurations and solutions aimed at enhancing the performance of components are therefore of considerable interest in this field of research. As a consequence of the economic and versatility advantages of the components, geothermal probes have been generally developed with materials like polyethylene, which presents, however, isolating behaviour that does not allow ideal heat exchange in ground source heat pump systems (GSHP). Innovative combinations of different materials are therefore necessary in order to improve thermal conductivity and to preserve the exceptional workability and commercial advantages of the finest elements available on the market. This work presents results coming from experimental tests involving standard polyethylene geothermal probes integrated with radial rings of polyacrylonitrile-based carbon fibre (PAN). Our evaluations are aimed at finding the best solutions for thermal exchange and adaptability with respect to traditional systems. Hydraulic and thermal performances and the response in a geo-exchange system have been verified. The new solutions appear to be highly suitable as geothermal exchangers in shallow geothermal systems and contribute to significantly reduce the total costs pertaining to the drilling operations.

Suggested Citation

  • Giovanni Floridia & Federica Blandini & Salvatore Iuculano & Giuseppe M. Belfiore & Marco Viccaro, 2020. "Innovative Solutions for Improving the Heat Exchange in Closed-Loop Shallow Geothermal Systems," Energies, MDPI, vol. 14(1), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:14:y:2020:i:1:p:108-:d:469242
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    References listed on IDEAS

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    1. Blázquez, Cristina Sáez & Martín, Arturo Farfán & Nieto, Ignacio Martín & García, Pedro Carrasco & Sánchez Pérez, Luis Santiago & González-Aguilera, Diego, 2017. "Analysis and study of different grouting materials in vertical geothermal closed-loop systems," Renewable Energy, Elsevier, vol. 114(PB), pages 1189-1200.
    2. 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).
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    Cited by:

    1. Giovanni Floridia & Salvatore Urso & Giuseppe Maria Belfiore & Marco Viccaro, 2022. "Thermal and Mechanical Improvement of Filling Mixture for Shallow Geothermal Systems by Recycling of Carbon Fiber Waste," Energies, MDPI, vol. 15(16), pages 1-13, August.

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