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 Final Report Prepared for the Alaska Energy Authority January, 2007 Copper Spike Fin II tubes, tube wall thickness 0.025”, 0.635” ID 4.5 Refrigerant Pump Based on the cycle analysis, the pump was chosen to be a regenerative pump from Roth Pump. 4.6 Control Electronics The Carrier CC6400 programmable controllers are used. One Carrier NetLink module was used for remote access and alarm relaying. 4.7 Power Electronics A compact Benshaw starter was used in the power plant design to provide less current inrush in order to enable startups on weak grid such as generators. An ABB inverter was employed for the pump. 4.8 System Qualification Testing During qualification testing at the United Technologies Research Center (UTRC) in Hartford, Connecticut, the system was operated for more that 1000 hours. The testing was conducted at the CHP lab of UTRC, where hot water was generated using plant steam, and cold water is supplied via a cooling tower. The table below summarizes the tests that were performed on the first unit. Test Turbine Thrust. Status Complete: Thrust less than 600 Lbf, lower at Chena condition. Complete: Noise measured with and without lagging. Muffler design on hold. Complete with scavenger. Complete: Does not cavitate with large increase in 16 Envelope testing Complete: Peak power 245 kW gross due to cooling tower limitations, Low power at stable 83 kW gross (~60 net). Closed-loop control implementation State Machine: Complete Continuous Control: see last slide. Monitoring: All current monitoring tasks tested with PC-6400 setup. Still need leak detection and purge operation. Sensor failures Complete: All alarms tested with a PC-6400 setup. Real unit: Level indicator forced to zero, Pump exit pressure unplugged. Vibration/noise testing Oil reclaim Pump Cavitation Loss of relay trips Complete: Done from low and mid-power levels. Turbine has minimum overspeed; pump does back- spin.

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