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Figure 4.7: Cycle efficiency as a function of reheat extraction pressure where the extraction pressure is normalized to the initial turbine inlet pressure. 4.2.4 Reference Cycle with a Closed Feedwater Heater in Place of Recuperation Feedwater heating, described in section 3.1.1, is a technique used in virtually every fossil fuel plant to de-aerate feedwater, as well as improve cycle efficiency by increasing the average heat addition temperature. Unlike recuperation, feedwater heating increases efficiency at the cost of mass flow rate through the low pressure turbine, decreasing turbine output. The Coolidge plant has been modeled with a closed feedwater heater1 in place of recuperation. The steam extraction pressure and mass flow rate were chosen based on maximizing efficiency and maintaining a 10°C pinch point in the heater. The feedwater heater was modeled such that the extraction steam would be fully condensed in the heater and then expanded to the condenser pressure and reincorporated into the working fluid stream. Figure 4.8 shows the system schematic and Figure 4.9 shows the cycle represented in a T-s diagram. Like recuperation, feedwater heating increases efficiency to 19.1% relative to the case with no energy recovery, but to a lesser degree than recuperation. 1 A “closed” feedwater heater indicates there is no physical contact between the hot and cold working fluid streams. 51PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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