Nexant Parabolic Trough Solar Power Plant Systems Analysis

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Nexant Parabolic Trough Solar Power Plant Systems Analysis ( nexant-parabolic-trough-solar-power-plant-systems-analysis )

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Task 2 Wet/Dry Heat Rejection Analysis $3,000,000 $2,000,000 $1,000,000 $0 20 25 30 35 40 45 50 -$1,000,000 -$2,000,000 -$3,000,000 -$4,000,000 Initial Temperature Difference, oF $60 $80 $100 $120 $140 Figure 5 Net Value to Plant as a Function of Initial Temperature Difference 2.5 Additional GateCycle Calculations With an air cooled condenser area of 2,645,000 ft2, corresponding to the nominal preferred initial temperature difference of 39 °F, the condenser pressure reaches 8 in. HgA with an ambient temperature of about 108 °F. With an ambient temperature of 130 °F, the condenser pressure reaches (on a theoretical basis) 14.2 in. HgA. In practice, the condenser pressure is likely to be limited to a value of about 8 in. HgA to prevent excessive aerodynamic loads on the last stage blades. To model the effect of this constraint on the output of the turbine, a series of additional GateCycle calculations were made at ambient temperatures of 110 °F, 120 °F, and 130 °F with the main steam flow rate reduced to the point where the condenser pressure does not exceed 8 in. HgA. The results are illustrated in Figure 6. The upper lines represents the turbine output with no constraints on the condenser pressure, and the lower line shows the turbine output with the pressure limited to 8 in. HgA. With ambient temperatures of 120 °F and 130 °F, the turbine output must be reduced by a significant 31 percent and 55 percent, respectively. However, a review of the dry bulb temperature histogram for Barstow in Figure 2 shows only a limited number of hours with temperatures above 110 °F. As a result, the -9- Net Value, $

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