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Numerical simulation of the thermal response of seabed sediments to geothermal cycles in Suvilahti, Finland

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  • Mohyla, Marek
  • Hrubesova, Eva
  • Martinkauppi, Birgitta
  • Mäkiranta, Anne
  • Tuomi, Ville

Abstract

Renewable thermal energy from seabed sediment is used for heating and cooling houses in Suvilahti, Vaasa, Finland. Innovative coaxial polyethylene pipes (Refla) filled with heat collection fluid are laid horizontally in the sediment layer. This study aims to evaluate the adequacy and possible overuse of this shallow geothermal energy. This entailed a numerical analysis of the heat relations of a “coaxial closed-loop geothermal system (CCGS)" to investigate the thermal behavior of the sediment. The numerical model was developed in Midas GTS NX software with a thermal analysis module. The objective was to understand temperature fluctuation in the sediment, which is influenced not only by geothermal energy exploitation, but also by seasonal weather. The numerical model, due to its design, provided information mainly about changes in sediment temperature due to the geothermal energy exploitation during the different seasons. The results show that in the first third of the total length of the Refla pipes, the sediment environment is significantly affected by energy exploitation's temperature loading. It is advisable to exclude the first third from an analysis of total geothermal energy reserves. The remaining two-thirds of the length shows potential to provide sustainable, long-term geothermal energy (GE) exploitation at the current rate.

Suggested Citation

  • Mohyla, Marek & Hrubesova, Eva & Martinkauppi, Birgitta & Mäkiranta, Anne & Tuomi, Ville, 2024. "Numerical simulation of the thermal response of seabed sediments to geothermal cycles in Suvilahti, Finland," Renewable Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:renene:v:221:y:2024:i:c:s0960148123016853
    DOI: 10.1016/j.renene.2023.119770
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