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Table 3 Properties of the rock/soil layers

From: An efficient hybrid model for thermal analysis of deep borehole heat exchangers

Rock/soil layers

Material

Depth (m)

Thermal conductivity (W m−1 K−1)

Specific heat capacity

(J kg−1 K−1)

Density (kg m−3)

Rock–soil 1

Soil–basalt

0–100

2.7

915

2750

Rock–soil 2

Granite

100–1400

2.78

925

2800

Rock–soil 3

Sandstone

1400–2000

2.8

920

2800

Rock–soil 4

Limestone

2000–2360

2.75

900

2780

Rock–soil 5

Sandstone

2360–2600

2.8

920

2800