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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Q=FA ⎡S−UL(T−T)⎤=m& ∫ToC dT [5.2.23] u RSF⎢Ci a⎥HTF HTF ⎣R ⎦Ti where UL/CR is the ratio of receiver tube loss coefficient and concentration ratio and S is insolation. FR is a dimensionless collector performance parameter. 5.3 Optimizing the APS Saguaro Plant The methodology described in the previous section is applied here to the APS Saguaro organic Rankine power cycle, which was designed specifically for use in a parabolic- trough solar powerplant. This will demonstrate both the power of the optimization methodology to reveal optimized design parameters, and also inform general observations about PTSP optimization. For this study the performance of the plant is characterized by the full-load model described in sections 2.3.3 and 2.5. Pressure drops and component efficiencies provided by the manufacturer were treated as “typical” and remained constant for all optimization cases. 5.3.1 APS Optimization Results & Discussion The design case for the APS plant is used as the reference for optimization. The working fluid was not changed and solar field outlet temperature was fixed to the reference 300oC and flow of 11.75 kg/s. Table 5.1 presents a summary of performance metrics for the optimization. Table 5.2 shows the heat exchanger allocation corresponding to the optimization. 79

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