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Geothermal pavements: A city-scale investigation on providing sustainable heating for the city of Cardiff, UK

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  • Makasis, Nikolas
  • Gu, Xiaoying
  • Kreitmair, Monika J.
  • Narsilio, Guillermo A.
  • Choudhary, Ruchi

Abstract

Geothermal pavements can be used with ground-source heat pump systems to sustainably provide energy for heating and cooling by incorporating ground heat exchanger elements underneath pavement surfaces. This work investigates the suitability of geothermal pavements at scale, adopting the city of Cardiff, UK, as a case-study. A two-scale modelling framework, combining detailed small-scale with holistic large-scale approaches, is presented, incorporating the accuracy of the former with the continuity of the latter. The results show that between 184 kWh and 345 kWh of thermal energy per metre length of pavement can be supplied annually, depending on soil profile. Moreover, geothermal operation can reduce anthropogenic heat flux into the ground from heated basements, and its associated negative impacts, by about 390 MWh/year. A city-scale analysis using population-consistent geographic areas called LSOAs, estimates that geothermal pavements can supply about 23% of the entire city residential heat demand, or up to 75% with heat sharing between LSOAs. The suitability of geothermal pavements for larger LSOAs is highlighted, supplying up to 100% of the annual domestic heat demand. Investigating the carbon emissions of heating and cooling technologies shows potential reductions of up to 75% when replacing gas boilers and resistance heating with geothermal pavement systems.

Suggested Citation

  • Makasis, Nikolas & Gu, Xiaoying & Kreitmair, Monika J. & Narsilio, Guillermo A. & Choudhary, Ruchi, 2023. "Geothermal pavements: A city-scale investigation on providing sustainable heating for the city of Cardiff, UK," Renewable Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:renene:v:218:y:2023:i:c:s0960148123011631
    DOI: 10.1016/j.renene.2023.119248
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