temperature due to the heat leak during transport based on Section 3.2.1.2. The return water temperature from the Rankine plant was varied from the condenser temperature of 38°C (FTR = 0) to a value of 250°C (FTR = 0.3). The Rankine plant performance is shown in Figure 17 with the same correction factor of 1.025 due to condenser conditions. The efficiency varies from 36% to 41% over this range of FTR when the loss of superheat during transport is zero. Based on 300°F superheat as a reference point, the efficiency correction factor is shown below (Ref. 13). This effect is also shown in Figure 17 as loss of degree superheat during energy transport between the collectors and the central Rankine plant. The remaining fluid transport subsystems (NaK, helium, chemical) all have sufficiently high temperatures to produce a 41.5% net Rankine plant efficiency. This corresponds to a 538°C (195°C superheat) turbine inlet temperature with a FTR = 0.6. Again a factor of 1.025 was applied to correct Reference 1 data for a 1.8" Hg condenser pressure. The Rankine plant performance given above was used in Section 4.2 to achieve system design points. 3.3.2.2 Rankine Plant Costs. The same reference used to develop the preceding section has also been used to develop Rankine plant cost data (Ref. 1). The equipment associated with fossil plant operation was removed and all costs were
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