Shallow subsurface heat recycling is a sustainable global space heating alternative

Susanne A. Benz (), Kathrin Menberg, Peter Bayer and Barret L. Kurylyk ()
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Susanne A. Benz: Dalhousie University, Centre for Water Resources Studies
Kathrin Menberg: Karlsruhe Institute of Technology, Institute of Applied Geosciences
Peter Bayer: Martin Luther University Halle-Wittenberg, Department of Applied Geology
Barret L. Kurylyk: Dalhousie University, Centre for Water Resources Studies

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Despite the global interest in green energy alternatives, little attention has focused on the large-scale viability of recycling the ground heat accumulated due to urbanization, industrialization and climate change. Here we show this theoretical heat potential at a multi-continental scale by first leveraging datasets of groundwater temperature and lithology to assess the distribution of subsurface thermal pollution. We then evaluate subsurface heat recycling for three scenarios: a status quo scenario representing present-day accumulated heat, a recycled scenario with ground temperatures returned to background values, and a climate change scenario representing projected warming impacts. Our analyses reveal that over 50% of sites show recyclable underground heat pollution in the status quo, 25% of locations would be feasible for long-term heat recycling for the recycled scenario, and at least 83% for the climate change scenario. Results highlight that subsurface heat recycling warrants consideration in the move to a low-carbon economy in a warmer world.

Date: 2022
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DOI: 10.1038/s41467-022-31624-6

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