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Table 6 Thermal parameters of the fluid, backfill material, inner pipe and outer pipe in the model

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

  Circulating fluid Backfill material Inner pipe Outer pipe
Thermal conductivity (W m−1 K−1) 0.56 0.93 0.01 54
Specific heat capacity (J kg−1 K−1) 4200 1800 2300 460
Density (kg m−3) 1000 1050 1925 7930
Kinematic viscosity (N s m−2) 1.31 × 10−3    
Dynamic viscosity (m2 s−1) 1.31 × 10−6