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Radial Outflow Turbine for Solar Steam Rankine Engines

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Radial Outflow Turbine for Solar Steam Rankine Engines ( radial-outflow-turbine-solar-steam-rankine-engines )

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With our nation's interest in switching to renewakie energy sources, the Department of Energy has been pursuing +ke ~enerati~n of electric power from solar energy. It has been fowd that ar, engine with a high conversion efficiency of ther- powerisrequiredtomakethisconcepteconomicallyviable. To produce the level of efficiency required with a steam Rankine and a high Since 1972, Energy Technology Inc. has worked on the devel- opmentor'anadvanced,small(under5000KW)steamturbine. The objective of the R&D effort has been to provide, at low cost, characteristics not available in commercial small steam turbines: thesebeingthecapabilityto: (1)accommodateinlettemperatures to 130O0F, ( 2 ) provide high efficiency throughout the complete load range for applications with pressu_-eratios greater than 40 to 1, and (3) accommodate extraction ports for feedva,ter heat- ing. Because of these characteristics, ETI's turbine was ideally suited for solar electric power generation and thus became the basis for this study. The investigation was directed towards modeling the perfor- mance of a turbine driven, steam Rankine power conversion sub- system to provide useful information for solar electric power system designers. A highly simplified design procedure for the turbine was built upon experimental data and previous design experience. ThiswasdonetcpermitthelargenumberofRanlkine cycles within the study's wide range of interest to be analyzed on a desktop computer. A sufficient number of Rankine cycles were evaluated to per- mit cycle efficiency to be obtained for any combination of the four basic parameters, which were the following: Turbine Inlet Temperature Turbine Inlet Pressure Condensing Temperature Power Output. A limited number of Rankine cycles was evaluated to show repre- sentative results for: Reheated Cycles Feedwater Heating Cycles Off DesignPerformance Overall Engine Efficiency Effect of No. of Turbine Stages. engine, a high temperature, high pressure cycle efficiency, low cost expander is needed. 2 mal to electrlc

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Radial Outflow Turbine for Solar Steam Rankine Engines

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