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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Figure 3.8: Turbine reheat system flow directions The two turbine stages are analyzed separately just as the single stage turbine was, using equation [3.1.3]. Their efficiencies need not be the same. The reheater is constrained using a pinch-point temperature, analogous to the boiler. The reheater receives heat transfer fluid directly from the solar field making hHTF,out in Figure 3.8 the new inlet to the boiler. Reference cycle with feedwater heating in place of recuperation The feedwater heater, like the recuperator, preheats the working fluid before it enters the boiler. In a feedwater heater system, hot vapor is extracted from the turbine at an intermediate pressure (requiring a two-stage turbine) and heat exchanged with the cold working fluid on its way to the boiler. This configuration is shown in Figure 3.9. In this case no recuperator is used and only the feedwater heater preheats the working fluid prior to the boiler. Figure 3.9: Closed feedwater heater flow schematic As shown in Figure 3.9 the hot vapor extracted from the turbine is assumed to be fully 29

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