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 5-1 Well Requirements for High Envelope Options # 1 to # 16 Scenario# Field Type 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Well Requirements 150 150 150 150 # 2422242223223423 # 2322232223223422 Reservoir T Nominal development size Power Cycle Type (SF, DF) Average well TMF Numberofproductionwellsrequired? Numberofinjectionwellsrequired Sum of MW MW Avge well Output MW/well Conversion Factors: Heat Rate MWth/MW Specific steam consumption HP turbine kg/sec/MW Specific steam consumption LP turbine kg/sec/MW 11.88 14.60 Injection / Prodn well mass ratio Reservoir Conditions: Reservoir T oC 0.77 260 1,135 0% 3.9 0.67 0.83 0.83 0.77 0.77 300 260 260 1,135 990 1,345 1,135 1,135 0%0%10%0%0% 0.67 230 990 0% Fluid H kJ/kg Excess H % Total Fluid H kJ/kg 300 260 1,345 1,135 10% 0% 230 300 990 1,345 Separator Parameters: SP1 MPaa ST1 oC 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 92 208 300 0.067 14 194 208 53.6 6.9 990 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 0.306 138 312 450 1,135 0.50 152 0.50 152 0.235 141 459 600 1,135 0.50 152 0.50 152 0.235 70 230 300 990 0.30 134 0.30 134 0.198 89 361 450 SP2 (for double flash) MPaa ST2 oC First Flash: X1 SF1 kg/sec 0.306 92 208 300 0.235 141 459 600 0.235 70 230 300 0.198 59 241 300 0.306 92 208 300 0.185 83 367 450 0.235 70 230 300 0.198 59 241 300 WF1 kg/sec TMF1 Second Flash: X2 kg/sec - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - SF2 kg/sec WF2 kg/sec TMF2 Plant Output: MW HP condensing MW MW LP condensing MW MW GCCU - based on overall efficiency MW MW GCCU BP Turbine MW MW OEC steam MW MW OEC binary MW MW Total MW 53.6 - - - - - - - - 26.6 17.8 17.8 19.5 55.1 Well Requirements: Required # production wells TMF each prodn well kg/sec 2 150 180 208 4 150 195 459 2 150 195 230 3 150 195 446 3 150 180 446 4 150 195 594 Silica Issues: SSI SP1 SSI at SP2 SSI in (ORCstm + ORCbinary) exit mix - 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 - - - - - 1.54 1.50 1.50 1.21 - - - - - - - - Sinclair Knight Merz. Capacity each injection well kg/sec Brine for injection kg/sec SKM Cost of Geothermal Power Report (2007 Cost Basis)R1.doc PAGE 21 oC 300 MW 50 SF kg/sec 150 260 260 230 300 50 20 20 50 SF SF SF DF 260 260 50 20 DF DF 150 150 230 300 260 205050 DF Hybrid Hybrid 150 150 150 260 230 20 20 Hybrid Hybrid 150 150 300 260 50 50 ORC ORC 150 150 260 230 20 20 ORC ORC 150 150 53.6 57.3 28.7 20.3 60.5 64.4 32.2 23.0 56.2 55.1 31.2 21.3 74.0 55.9 28.0 29.4 26.8 14.3 14.3 10.2 30.2 16.1 10.58 2.5 3.1 0.77 16.1 10.58 2.5 3.1 0.77 11.5 28.1 12.94 7.18 18.4 15.6 10.7 24.7 14.0 14.0 9.8 8.18 12.17 12.17 15.14 7.53 11.88 1.7 2.5 00 0.83 0.77 6.67 2.9 1.7 0 2.0 0.67 0.83 9.27 10.91 13.92 - - - - 53.6 - 57.3 - 28.7 - - - 20.3 60.5 64.4 2 2 4 150 150 150 225 180 195 241 194 437 - - 32.2 23.0 2 2 150 150 195 225 219 230 57.3 28.7 20.3 - - - - - - - - - 9.5 - - - 4.7 - - - 1.51 1.50 1.50 1.07 1.51 1.50 1.50 1.07 2.5 0 2.9 230 300 990 1,345 0% 10% 260 1,135 0% 1,135 0.50 152 0.25 127 0.235 141 459 600 0.048 22 437 459 57.3 7.0 260 1,135 0% 1,135 0.50 152 0.25 127 0.235 70 230 300 0.048 11 219 230 28.7 3.5 0.77 260 1,135 0% 10% 0% 0.77 0.67 260 230 - - - - - 19.7 9.9 56.2 2 150 180 297 15.1 6.6 31.2 2 150 195 297 12.7 3.9 21.3 2 150 225 297 59.1 14.9 74.0 42.7 13.2 55.9 21.4 6.6 28.0 2 150 195 297 23.5 5.9 29.4 3 150 225 446 Required#injecnwells 2322232223223422

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