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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