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Estimating low-enthalpy geothermal energy potential for district heating in Santiago basin–Chile (33.5 °S)

Author

Listed:
  • Muñoz, Mauricio
  • Garat, Pablo
  • Flores-Aqueveque, Valentina
  • Vargas, Gabriel
  • Rebolledo, Sofía
  • Sepúlveda, Sergio
  • Daniele, Linda
  • Morata, Diego
  • Parada, Miguel Ángel

Abstract

This work presents the results of a regional-scale estimation of low-enthalpy geothermal resources for district heating in the Santiago basin. The purpose of this work is to identify promising areas for the development of this type of renewable energy. The estimation was based on comparison of soil thermal properties and hydrogeological parameters, using Geographic Information System (GIS). To determine the geothermal potential, Ground Source Heat Exchanger (GSHE) coupled with heat pump was used to supply a fixed demand equivalent to the energy required to heat a Chilean standard house. The main barrier for the implementation of a GSHE coupled with heat pump is the well drilling cost, therefore the potential is presented as meters to be drilled in order to install 2 types of GSHE: 1) Borehole Heat Exchanger (BHE) and 2) Groundwater Heat Exchanger (GWHE). To assess the BHE, we used specific Heat Extraction (sHE) of sediments. To evaluate a GWHE, we used depth of groundwater table and groundwater drawdown caused by pumping water to the heat pump. The depth to be drilled ranges from 35 to 105 m in case of the BHE, while in case of the GWHE it ranges from 10 to 400 m.

Suggested Citation

  • Muñoz, Mauricio & Garat, Pablo & Flores-Aqueveque, Valentina & Vargas, Gabriel & Rebolledo, Sofía & Sepúlveda, Sergio & Daniele, Linda & Morata, Diego & Parada, Miguel Ángel, 2015. "Estimating low-enthalpy geothermal energy potential for district heating in Santiago basin–Chile (33.5 °S)," Renewable Energy, Elsevier, vol. 76(C), pages 186-195.
    • Handle: RePEc:eee:renene:v:76:y:2015:i:c:p:186-195
    DOI: 10.1016/j.renene.2014.11.019
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    5. Steffen Nielsen & Lars Grundahl, 2018. "District Heating Expansion Potential with Low-Temperature and End-Use Heat Savings," Energies, MDPI, vol. 11(2), pages 1-17, January.
    6. Walch, Alina & Mohajeri, Nahid & Gudmundsson, Agust & Scartezzini, Jean-Louis, 2021. "Quantifying the technical geothermal potential from shallow borehole heat exchangers at regional scale," Renewable Energy, Elsevier, vol. 165(P1), pages 369-380.
    7. Galgaro, A. & Di Sipio, E. & Carrera, A. & Dalla Santa, G. & Escudero, A. Ramos & Cuevas, J.M. & Pasquali, R. & Sanner, B. & Bernardi, A., 2022. "European and municipal scale drillability maps: A tool to identify the most suitable techniques to install borehole heat exchangers (BHE) probes," Renewable Energy, Elsevier, vol. 192(C), pages 188-199.
    8. Luo, Jin & Wang, Haiqi & Zhang, Haiyong & Yan, Zezhou, 2021. "A geospatial assessment of the installation potential of shallow geothermal systems in a graben basin," Renewable Energy, Elsevier, vol. 165(P1), pages 553-564.
    9. Böttcher, Fabian & Casasso, Alessandro & Götzl, Gregor & Zosseder, Kai, 2019. "TAP - Thermal aquifer Potential: A quantitative method to assess the spatial potential for the thermal use of groundwater," Renewable Energy, Elsevier, vol. 142(C), pages 85-95.
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