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Chena Geothermal Power Plant Project Final Report Prepared for the Alaska Energy Authority January, 2007 from the refrigerant flow at 80% aerodynamic efficiency. After accounting for mechanical and electrical losses 250 kW of electrical power is delivered by the generator. The refrigerant vapor leaving the turbine (state point 2) is de-superheated, condensed at 53 °F and then slightly subcooled to state point 3 in the 2.36 MWth water-cooled condenser. The condenser heat is transferred to 1615 gpm of 40 °F cold water (point C) that is heated to 50 °F (point D). The refrigerant loop is closed by a pump, which elevates the refrigerant pressure from 65 psia (state point 3) to 245 psia (state point 4). The pump requires 40 kW of electrical power. Accounting for all losses, the net power produced by each power plant module is 210 kW. This can be increased when using the air cooled condenser during the winter months. Major components of the ORC system were sized based on the cycle analysis elaborated above and are described in the following sections: 4.3 Turbogenerator The turbogenerator component combines a radial inflow turbine with an internal gearbox and an induction generator in a single hermetically sealed unit as shown in Figure 6. Generator cooling is provided by the working fluid. This hermetic design reduces maintenance and eliminates issues with shaft seal leakage typical of existing geothermal plants. The single-stage radial inflow turbine is the most cost effective turbine design possible. The turbine is internally lubricated with a high temperature lubricant that is compatible with the working fluid and has been qualified for use up to 350 °F in the PureCycle® 200 test program. The turbine can be specified with a rotor and multi-port conical nozzles chosen from a range of standard options to provide the optimal performance for specific design points. The Bill of Materials (BOM) of the PureCycle® turbogenerator has a total of 171 line items. Relative to the corresponding chiller compressor assembly, the PureCycle turbogenerator has only 13 unique manufactured parts. There are no significant changes in processes, patterns or tooling. This allows for the turbine to be manufactured with the same consistent quality as commercial chiller plants. Figure 6: Internal view of the 19XR2 turbogenerator Several modifications were made to the turbine design, which included installing a particle filter over nozzle to prevent impeller erosion, redesigning the turbine wheel and cap to lower thrust load, removing inlet-guide-vanes and reshaping the suction housing to recover static pressure, opening nozzles to a diameter of 0.457”, and resizing the impeller to achieve desired mass flow rate for this application. 14PDF Image | 400kW Geothermal Power Plant at Chena Hot Springs
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