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Task 2 Wet/Dry Heat Rejection Analysis For the purposes of the study, a fixed charge rate of 0.15 has been assumed. The line labeled “Condenser cost, $” is derived from the data shown in Figure 4 (Reference 2). y = 79.09605x2 - 8870.05650x + 322033 $190,000 $170,000 $150,000 $130,000 $110,000 $90,000 $70,000 20 25 30 35 40 45 50 55 60 Initial Temperature Difference, oF Figure 4 Unit Air Cooled Condenser Cost as a Function of Initial Temperature Difference The “Incremental capital cost, $” is the capital cost of the condenser compared to the capital cost of the condenser at the selected reference initial temperature difference of 44 °F. The “Net cost benefit” is the incremental capital cost minus the allowable incremental capital cost. The results for the six initial temperature differences, at each of five energy values between $60/MWhe and $140/MWhe, are illustrated in Figure 5. The ordinate locations of the curves are arbitrary since the adoption of a reference initial temperature difference of 44 °F was also arbitrary. The curves show the optimum initial temperature difference is likely to be in the range of 35 °F to 40 °F. Further, the curves show the optimum temperature difference is, to a large degree, insensitive to the selling price of the electric energy. As noted in Table 3, the analyses assumed the Rankine cycle operated at full load throughout the year. This simplifying assumption was made to determine the sensitivity of the preferred initial temperature difference on the overall plant economics. A more detailed performance and economic analysis, based on the Excelergy program, is discussed in Section 4. -8- Unit ACC Cost, $/MWtPDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis
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