Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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54 Figure 4.11: T-S Diagram for a reference cycle with the addition of a single closed feedwater heater. 4.2.6 Summary and Conclusions The Coolidge plant has been modeled based on design specifications. Several cycle configurations were similarly modeled to evaluate their performance operating with similar thermal and component performance boundary conditions. Included in this study were: turbine reheat, turbine-exhaust recuperation, and closed feedwater heating. Table 4.2 summarizes the results. Table 4.2 ORC Performance Summary Cycle Reference Reference without recuperation Reference with Turbine Reheat Feedwater Heating Reference with Feedwater Heating Thermal Efficiency 23.1% 17.6% 24.1% 19.1% 23.6% The highest efficiency cycle utilized turbine reheat. The addition of reheat resulted in an increase in the average heat addition temperature, increasing cycle efficiency. This benefit comes at the cost of an additional turbine and heat exchanger. In addition, reheat creates an added discontinuity in the heating curve of the working fluid making it more

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