Table 4 BHE and ground properties

Fuild properties

Thermal conductivity

0.468

\(\text {W}\,\text {m}^{-1}\,\text {K}^{-1}\)

Density

1026

\(\text {kg}\,\text {m}^{-3}\)

Volumentric heat capacity

4123,494

\(\text {J}\,\text {m}^{-3}\,\text {K}^{-1}\)

Dynamic viscosity

0.00337

Pa s

BHE geometry

Length

120

m

Diameter

0.150

m

Shank space

0.083

m

Outer diameter pipes

0.0334

m

Pipe wall thickness

0.0037

m

BHE-properties

Thermal conductivity grout

2.0

\(\text {W}\,\text {m}^{-1}\,\text {K}^{-1}\)

Volumetric heat capacity grout

3900000

\(\text {J}\,\text {m}^{-3}\,\text {K}^{-1}\)

Thermal conductivity pipe

0.4

\(\text {W}\,\text {m}^{-1}\,\text {K}^{-1}\)

Ground properties

Average thermal conductivity

1.9

\(\text {W}\,\text {m}^{-1}\,\text {K}^{-1}\)

Average volumetric heat capacity

2052000

\(\text {J}\,\text {m}^{-3}\,\text {K}^{-1}\)

Undisturbed ground temperature

15.0

\(^\circ {C}\)