Science – Society – Technology
Table 1 GEOPHIRES input parameters for example simulation 1
From: GEOPHIRES v2.0: updated geothermal techno-economic simulation tool
Subsurface parameters | |||
Reservoir type | Sedimentary matrix flow | Reservoir model | TOUGH2 |
Well configuration | Doublet | Well depth | 2000 m |
Number of production wells | 1 (vertical) | Number of injection wells | 1 (vertical) |
Production well inner diam. | 0.20 m (8″) | Injection well inner diam. | 0.20 m (8″) |
Productivity index | 5 kg s−1 bar−1 | Injectivity index | 5 kg s−1 bar−1 |
Bottom-hole temperature | 120 °C | Production well flow rate | 50 kg s−1 |
Reservoir thickness | 250 m | Water loss rate | 0% |
Reservoir width | 500 m | Well separation | 900 m |
Rock heat capacity | 1000 J kg−1 K−1 | Reservoir porosity | 10% |
Rock density | 2700 kg m−3 | Reservoir permeability | 10−13 m2 (100 md) |
Rock thermal conductivity | 2.5 W m−1 K−1 | Wellbore heat transmission | Ramey’s model |
Geofluid | Pure water | ||
Surface parameters | |||
End-use | Direct-Use Heat | Utilization factor | 90% |
Re-injection temperature | 80 °C | Pump efficiency | 75% |
Surface temperature | 15 °C | End-use efficiency | 90% |
Economic parameters | |||
Levelized cost model | BICYCLE model | Project lifetime | 30 years |
Bond financing fraction | 65% | Equity financing fraction | 35% |
Nominal bond interest rate | 7% | Nominal equity interest rate | 12% |
Inflation rate | 2.5% | Income tax rate | 30% |
Gross revenue tax rate | 0% | Investment tax credit rate | 0% |
Property tax rate | 0% | Surface equipment cost | $5 M |
Electricity rate for pumping | 7 ¢ kWh−1 | All other costs | Built-in correlations |