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Transient evaluation of a soil-borehole thermal energy storage system

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  • Başer, Tuğçe
  • McCartney, John S.

Abstract

This study focuses on the simulation of transient ground temperatures in a field-scale soil-borehole thermal energy storage (SBTES) system in San Diego, California. The SBTES system consists of an array of thirteen 15 m-deep borehole heat exchangers installed in conglomerate bedrock at a spacing of approximately 1.5 m. Heat collected from solar thermal panels was injected into the SBTES system over a 4-month period, after which the subsurface was monitored during a 5-month ambient cooling period. The SBTES system is located in the vadose zone above the water table with relatively dry subsurface conditions, so a coupled heat transfer and water flow model was used to simulate the ground response using thermo-hydraulic constitutive relationships and parameters governing vapor diffusion and water phase change calibrated using soil collected from the site. The simulated ground temperatures from the model match well with measurements from thermistors installed at different radial locations and depths in the SBTES system and are greater than those simulated using a conduction-only model for saturated conditions. Significant overlap between the effects of the borehole heat exchangers was observed in terms of the ground temperature. Although the numerical simulations indicate that permanent decreases in degree of saturation and thermal conductivity occurred at the borehole heat exchanger locations, the zone of influence of these changes was relatively small for the particular site conditions.

Suggested Citation

  • Başer, Tuğçe & McCartney, John S., 2020. "Transient evaluation of a soil-borehole thermal energy storage system," Renewable Energy, Elsevier, vol. 147(P2), pages 2582-2598.
    • Handle: RePEc:eee:renene:v:147:y:2020:i:p2:p:2582-2598
    DOI: 10.1016/j.renene.2018.11.012
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    References listed on IDEAS

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    1. Marcotte, D. & Pasquier, P., 2014. "Unit-response function for ground heat exchanger with parallel, series or mixed borehole arrangement," Renewable Energy, Elsevier, vol. 68(C), pages 14-24.
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    2. Mahon, Harry & O'Connor, Dominic & Friedrich, Daniel & Hughes, Ben, 2022. "A review of thermal energy storage technologies for seasonal loops," Energy, Elsevier, vol. 239(PC).
    3. Henok Hailemariam & Frank Wuttke, 2020. "Cyclic Mechanical Behavior of Two Sandy Soils Used as Heat Storage Media," Energies, MDPI, vol. 13(15), pages 1-12, July.
    4. Bulmez, A.M. & Ciofoaia, V. & Năstase, G. & Dragomir, G. & Brezeanu, A.I. & Şerban, A., 2022. "An experimental work on the performance of a solar-assisted ground-coupled heat pump using a horizontal ground heat exchanger," Renewable Energy, Elsevier, vol. 183(C), pages 849-865.
    5. Rotta Loria, Alessandro F., 2021. "The thermal energy storage potential of underground tunnels used as heat exchangers," Renewable Energy, Elsevier, vol. 176(C), pages 214-227.
    6. Ekmekci, Ece & Ozturk, Z. Fatih & Sisman, Altug, 2023. "Collective behavior of boreholes and its optimization to maximize BTES performance," Applied Energy, Elsevier, vol. 343(C).
    7. Ekmekci, Ece & Aydin, Murat & Ozturk, Z. Fatih & Sisman, Altug, 2024. "Very high temperature BTES: A potential for operationally cost-free and emission-free heating," Applied Energy, Elsevier, vol. 360(C).
    8. Pokhrel, Sajjan & Amiri, Leyla & Zueter, Ahmad & Poncet, Sébastien & Hassani, Ferri P. & Sasmito, Agus P. & Ghoreishi-Madiseh, Seyed Ali, 2021. "Thermal performance evaluation of integrated solar-geothermal system; a semi-conjugate reduced order numerical model," Applied Energy, Elsevier, vol. 303(C).

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