TCD
Summary
Researchers at the National Renewable Energy Laboratory set out to test whether summer heat could be stored underground and reused to warm buildings in winter.
The team, which published its study in Energy and Buildings, focused on one of the coldest places in the United States: Fairbanks, Alaska.
Borehole thermal energy storage collects waste heat, like from a nearby coal plant, during summer and stores it underground in a field of deep, vertical shafts. When winter hits, that heat is pulled back and distributed through geothermal heat pumps to warm buildings.
In Fairbanks, where heating demand is over five times higher than cooling demand, this kind of system could cut dependence on dirty energy sources.
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