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4. Annual Plant Performance The net electric outputs for the plants with dry and wet heat rejection were estimated using the Excelergy computer program. The plant designs were based on the characteristics listed in Table 6. Table 6 Plant Design Parameters for Use In Excelergy Parameter Collector type Collector field aperture area, m2 Solar multiple Gross plant output, MWe Gross cycle efficiency Solar field design parameters Solar field parasitic power demand Power block design parameters Power block parasitic power demand Value LS-2+ 534,230 1.45 88.0 0.377 Default Default Default Default 1 Task 2 Wet/Dry Heat Rejection Analysis Note 1: With separate calculations for cooling tower and circulating water pump auxiliary power consumption 4.1 Dry Heat Rejection The gross output of the Rankine cycle was calculated using the standard Excelergy format, as follows: Nth = .Qtpb / Qdesign Nel = T2EPLF0 + (T2EPLF1)(Nth) + (T2EPLF2)(Nth)2 + (T2EPLF3)(Nth)3 + (T2EPLF4)(Nth)4 .EgrSol = Edesign * Nel where .Qtpb is the thermal power to the steam generator at each time step, Qdesign is the design thermal power to the steam generator, .EgrSol is the gross turbine output at each time step, and Edesign is the design gross turbine output. The part load thermal-to-electric coefficients T2EPLF0 through T2EPLF4 are the default Excelergy values; i.e., the ratio of part load to full load Rankine cycle efficiency is assumed to be independent of the heat rejection system. The effect of the ambient temperature on the gross cycle output is also modeled using the standard Excelergy format, as follows: Ntc = TempCorr0 + TempCorr1 * Ttc + TempCorr2 * Ttc2 + TempCorr3 * Ttc3 + TempCorr4 * Ttc4 .EgrSol = .EgrSol * Ntc - 15 -PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis
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