Fig. 7From: Impact of operational temperature changes and freeze–thaw cycles on the hydraulic conductivity of borehole heat exchangersSchematic cross section of the pilot-scale experiment with sensor positions. Skin (red) is positioned in the skin zone, Soil (blue) BHE + 30 mm, Soil 2 (green) BHE + 60 mm, Soil 3 (yellow) BHE + 120 mm. BHEin (orange) and BHEout (blue) sits at the inlet of the pipe. Vessel_N, Vessel_SW and Vessel_SE (black) are located at the outside of the tank (all sensor positions are projected into the shown cross section plotted herein)Back to article page