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Table 1 Preselection of input parameters for sensitivity analysis
Parameter | Symbol |
|---|---|
Dimensions | |
BHE length | \(L_{BHE}\) |
Borehole diameter | \(d_{BHE}\) |
Pipe diameter (outer) | \(d_{po}\) |
Pipe material | |
Thermal conductivity | \(\lambda _{p}\) |
Refrigerant | |
Density | \(\rho _{rf}\) |
Specific heat capacity | \(c_{rf}\) |
Thermal conductivity | \(\lambda _{rf}\) |
Dynamic viscosity | \(\mu _{rf}\) |
Grout | |
Thermal conductivity | \(\lambda _{gr}\) |
Specific volumetric heat capacity | \(c_{vgr}\) |
Geological subsurface | |
Effective porosity | \(n_{Peff}\) |
Thermal conductivity | \(\lambda _{s}\) |
Specific volumetric heat capacity | \(c_{vs}\) |
Thickness of the layer with groundwater flow | \(t_{aqf}\) |
Depth of the layer with groundwater flow* | \(z_{aqf}\) |
Initial and boundary conditions | |
Flow rate of refrigerant | \({\dot{V}}_{rf}\) |
Annual heat demand | Q |
Darcy velocity | \(v_f\) |
Geothermal gradient | \(\Delta T_{geo}\) |
Variation of the undisturbed subsurface temperature** | \(T_{geo}\) |