400kW Geothermal Power Plant at Chena Hot Springs

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400kW Geothermal Power Plant at Chena Hot Springs ( 400kw-geothermal-power-plant-at-chena-hot-springs )

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Chena Geothermal Power Plant Project Prepared for the Alaska Energy Authority Final Report January, 2007 flow rate. Over 40 grid outages were done. Complete. Complete, as of 5/15: 1000 hours Table 1. Scope and status of the qualification test at UTRC Power trips Startup current, Beckwith Endurance 300 250 200 150 100 50 0 12:00:00 PM 1:12:00 PM 2:24:00 PM 3:36:00 PM Turn 4:48:00 PM Mar02,06 - b Heat Change hot Turbine water OilSumpP OilP EvapExitP PumpExitP CondPres Mar02,06 - b (Generator power - Ref. Pump Power) 250 Greater than 200 kW net Power consumed by pump before 200 150 100 50 0 12:00:00 PM -50 1:12:00 PM 2:24:00 PM 3:36:00 PM 4:48:00 PM Mar02,06 - b: Startup 12:00:00 PM PM PM PM PM 300 250 200 150 100 50 Col 0 Fast and smooth Turbine on before f ull d water Heat 12:14:24 12:28:48 12:43:12 12:57:36 OilSumpP OilP EvapExitP PumpExitP CondPres 180 160 140 120 100 80 60 Mar02,06 - b: Water temperatures only ... even though cold water is ~10F warmer than CondEWT EvapEWT CondLWT 40 12:00:00 1:12:00 2:24:00 3:36:00 4:48:00 PM PM PM PM PM Figure 7: Typical operating data from test at UTRC During testing, inspection of the turbine impeller found erosion, shown in Figure 8. Additionally, the turbine nozzle filter failed with penetration holes. Further investigation determined that the turbine was run backwards, i.e. as a compressor, during the early stage of commissioning the unit in the lab. In addition, further study of start-up procedure found that following the refrigerant charging process, turbine was immediately flooded with manufacturing debris left in the condenser once the service valve is open. 17 Chena. Net Power (kW) Pressure (psia) Temperature (F) Pressure (psia)

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