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4.2.5 Reference Cycle with Feedwater Heating This cycle incorporates both a closed feedwater heater and recuperator to improve efficiency. The recuperator from the reference cycle is coupled with a closed feedwater heater from the previous configuration. Figure 4.10 shows a schematic of this cycle with labeled state points that correspond to the T-s diagram in Figure 4.11. Before entering the boiler, the working fluid passes first through the recuperator then the closed feedwater heater. The heat exchangers were sequenced in this fashion due to the flexibility in the closed feedwater heater. The temperature of the turbine exhaust is fixed and thus so is the potential outlet temperature of the recuperator. The feedwater heater extraction pressure can be altered to change the hot-side inlet conditions and can thus be tailored to match the outlet of the recuperator. The feedwater heater extraction pressure and mass flow were then set to achieve a pinch point of 10°C. Adding a closed feedwater heater to the reference cycle improves efficiency only slightly, to 23.6%. Figure 4.10: Power cycle schematic for the Coolidge reference plant with the addition of a single closed feedwater heater. 53PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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