ABSTRACT
Energy foundations and other thermo-active ground
structures, energy wells, and pavement or bridge deck heating / cooling represent
an innovative technology that contributes to environmental protection and provides
substantial long-term cost savings and minimized maintenance. The paper focuses
on earth-contact concrete elements that are already required for structural reasons,
but which simultaneously work as heat exchangers. Absorber pipes filled with a heat
carrier fluid are installed within conventional structural elements (piles, barrettes,
diaphragm walls, basement slabs or walls, tunnel linings), forming the primary circuit
of a geothermal energy system. The natural ground temperature is used as a heat
source in winter and for cooling in summer. Hence no additional elements have to
be installed below surface. The primary circuit is then connected via a heat pump
to a secondary circuit within the building.
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