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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