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Fig. 8 | Geothermal Energy

Fig. 8

From: Impact of operational temperature changes and freeze–thaw cycles on the hydraulic conductivity of borehole heat exchangers

Fig. 8

Mean values of hydraulic conductivity measurements of KBHE at varying temperature steps with initial state (A), cooling process (black) to 3 °C (B), heating process (red) to 12 °C (C), heating process after FTC6 (green, D) and comparison values of a parallel experiment according to VDI 4640-2 (2019) with the same grout–pipe material combination at 20 °C, mean values of 3 specimen 600 readings each (E)

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