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Current Costs of Geothermal Power Generation in New Zealand

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Current Costs of Geothermal Power Generation in New Zealand ( current-costs-geothermal-power-generation-new-zealand )

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Assessment of the Costs of Geothermal Power Generation in New Zealand Table 5-2 Well Requirements for Low Envelope Options # 17 to # 32 Scenario# Field Type 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Well Requirements Reservoir T Nominal development size Power Cycle Type (SF, DF) Average well TMF Number of production wells required? Numberofinjectionwellsrequired Sum of MW Avge well Output Heat Rate Specific steam consumption HP turbine Specific steam consumption LP turbine Injection / Prodn well mass ratio Reservoir T Fluid H Excess H Total Fluid H SP1 ST1 SP2 (for double flash) ST2 X1 SF1 WF1 TMF1 X2 SF2 WF2 TMF2 MW HP MW LP MW GCCU - based on overall efficiency MW GCCU BP Turbine MW OEC steam M We OEC binary MW Total Required # production wells TMF each prodn well Capacity each injection well Brine for injection Required#injecnwells 4734363457446945 Conversion Factors: 8.9 4.8 7.53 11.88 1.7 2.5 4.8 11.88 2.5 3.4 10.1 14.60 6.67 2.9 1.7 0 2.0 0.67 0.83 5.4 10.58 2.5 3.1 0.77 5.4 10.58 2.5 3.1 0.77 3.8 9.4 12.94 7.18 6.1 9.27 5.2 3.6 8.2 4.7 4.7 3.3 10.91 13.92 8.18 12.17 12.17 15.14 Reservoir Conditions: oC 230 300 990 1,345 0% 10% 260 1,135 0% 1,135 0.50 152 0.25 127 0.235 117 383 500 0.048 18 364 383 47.8 5.9 260 1,135 0% 1,135 0.50 152 0.25 127 0.235 47 153 200 0.048 7 146 153 19.1 2.3 0.77 230 300 260 990 1,345 1,135 0% 10% 0% Separator Parameters: 1,479 1.90 210 1,135 0.50 152 1,135 0.50 152 990 0.30 134 1,479 1.90 210 1.00 180 0.306 77 173 250 0.067 12 162 173 44.7 5.7 990 0.30 134 0.15 111 0.198 59 241 300 0.042 10 230 241 20.3 2.6 1,479 1.90 210 1,135 1.00 180 1,135 0.50 152 990 0.30 134 1,479 1.90 210 1.90 210 0.306 107 243 350 1,135 0.50 152 0.50 152 0.235 129 421 550 1,135 0.50 152 0.50 152 0.235 59 191 250 990 0.30 134 0.30 134 0.198 69 281 350 First Flash: 0.306 92 208 300 0.235 129 421 550 0.235 59 191 250 0.198 59 241 300 0.306 92 208 300 0.185 83 367 450 0.235 47 153 200 0.198 59 241 300 Second Flash: kg/sec kg/sec kg/sec - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Plant Output: MW MW MW MW MW MW MW 53.6 - - - - - - - - 26.6 Well Requirements: 6 50 60 208 11 50 65 5 50 65 191 9 50 65 446 7 50 60 347 11 50 65 Silica Issues: SSI SP1 SSI at SP2 SI in (ORCstm + ORCbinary) exit mix 421 - - - - - 1.54 1.50 1.50 1.21 - - - - - - - - Sinclair Knight Merz SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 22 oC 300 MW 50 SF kg/sec 50 260 260 230 300 50 20 20 50 SF SF SF DF 50 50 50 50 260 260 50 20 DF DF 50 50 230 300 260 205050 DF Hybrid Hybrid 505050 260 230 20 20 Hybrid Hybrid 50 50 300 260 50 50 ORC ORC 50 50 260 230 20 20 ORC ORC 50 50 # 6115651046694671157 # 4734363457446945 MW MW/ well MWth / MW kg/sec/MW kg/sec/MW 53.6 52.5 23.9 20.3 50.4 53.6 21.5 23.0 56.2 55.1 20.8 21.3 57.6 51.3 23.3 22.9 kJ /kg % kJ /kg MPa abs oC 10% 0% 0% MPa abs oC kg/sec kg/sec kg/sec kg/sec kg/sec 545 - 1.14 1.12 1.12 0.92 1.14 1.12 1.12 0.92 1.14 0.83 1.12 0.92 1.14 1.12 1.12 0.92 000 0.83 0.77 0.77 300 260 260 1,345 1,135 1,135 3.9 0.67 0.83 0.77 0.67 0.83 0.77 0.77 260 230 300 260 260 1,135 990 1,345 1,135 1,135 0%0%10%0%0% 0.67 230 990 0% - - - - - - - - 19.7 9.9 56.2 6 50 60 297 6.4 10.0 4.4 20.8 4 50 65 198 4.7 12.7 3.9 21.3 6 50 75 297 46.0 11.6 57.6 39.2 12.1 51.3 17.8 5.5 23.3 5 50 65 248 18.3 4.6 22.9 7 50 75 347 - 53.6 - 52.5 - 23.9 - - - 20.3 50.4 53.6 6 5 10 50 50 50 75 60 65 241 162 364 - - 21.5 23.0 4 6 50 50 65 75 146 230 52.5 23.9 20.3 - - - - - - 1.51 1.50 1.50 1.07 1.51 1.50 1.50 1.07 2.9 - ---- - - 17.8 17.8 19.5 55.1 - -

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