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Table 5 Hydraulic conductivities (m s−1) measured after each FTC at 3 °C as well as the measurements at 12 °C before and after the experiment (± calculated measurement uncertainty)

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

FTC 0 1 2 3 4 5 6
KSOIL,12 2.0 × 10–8 ± 2.6 × 10–10
KBHE,12 4.9 × 10–10 ± 3.9 × 10–10 9.4 × 10–8 ± 3.4 × 10–9
KSOIL,3 6.0 × 10–8 ± 1.5 × 10–9 6.8 × 10–8 ± 1.8 × 10–9 8.2 × 10–8 ± 2.1 × 10–9 4.5 × 10–8 ± 1.1 × 10–9 1.3 × 10–7 ± 2.7 × 10–9 5.4·10–8 ± 1.3 × 10–9 8.3 × 10–8 ± 2.1 × 10
KBHE,3 1.8 × 10–7 ± 6.3 × 10–9 2.1 × 10–7 ± 7.5 × 10–9 2.2 × 10–7 ± 7.7 × 10–9 3.5 × 10–7 ± 8.1 × 10–9 2.5 × 10–7 ± 8.7 × 10–9 2.3 × 10–7 ± 8.1 × 10–9 2.0 × 10–7 ± 6.9 × 10–9