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Table 3 Values of thermal properties for the selected rock types

From: Optimization of the utilization of deep borehole heat exchangers

Rock typeMinimum thermal conductivity value (W m−1 K−1)Average thermal conductivity value (W m−1 K−1)Maximum thermal conductivity value (W m−1 K−1)Volumetric heat capacity (J m−3 K−1)
Sandstone2.063.8955.732.05 × 106
Limestone1.22.153.12.155 × 106
Granite2.122.873.622.33 × 106