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The effect of the above variations on the solar fluid outlet temperature for the ambient temperature of 80°F (26.7°C) is shown in Figure 17. For the sake of clarity, the outlet temperatures for ambient temperature of 100°F (37.8°C) are not shown in this figure. The outlet temperature for the maximum efficiency point for MH = 0.35 is about 342°F (172.2°C), while for the optimum base case it is 381°F (193.9°C). This figure indicates that the above variations have very small effect on the solar-side fluid outlet temperature. The impact of the above variations on the net power output of the cycle is shown in Figure 18. The optimum base design produces a net power output of 1,137 kWe (not including the pumping power for the solar side). The MH = 0.35 case produces a net power output of 358 kWe at its maximum efficiency point. The simulation software (Aspen Technology, Inc.) that was used for this study did not have special features to maintain a fixed turbine size. However, we maintained the turbine size fixed for all of our cycles by fixing the nozzle size at chocked flow design conditions. To maintain a chocked flow, the turbine flow characteristic was calculated from the following: P T m8 = 1.093 * The flow rate is in lbm/hr, and P and T are the turbine inlet pressure (psia) and temperature (R). 25 20 15 10 "MH=0.75, Ta=80 F" "MH=0.5, Ta=80 F" "MH=0.35, Ta=80 F" "MH=1, Ta=80 F" 0 200 400 600 800 Net Power Output, kW 1000 1200 Figure 18. Net cycle power output versus cycle efficiency for Ta = 80°F Figure 16: Net Cycle Power Output, vs. Cycle Efficiency for Ta = 80 F 24 Cycle EfficiencyPDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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