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Task 2 Wet/Dry Heat Rejection Analysis where Ttc is the dry bulb temperature, and the five coefficients TempCorr0 through TempCorr4 are derived from a fourth order polynomial fit of GateCycle calculations of the gross turbine output plotted as a function of the dry bulb temperature. The gross turbine output assumes all 14 cooling tower fans are in operation when the turbine is operating at or near full load, regardless of the ambient temperature. In principal, it may be possible to turn off some of the fans at low ambient temperatures to reduce the parasitic energy demand. To explore the potential energy savings, a series of GateCycle calculations were performed for the following conditions: 60 °F ambient temperature; 50 percent relative humidity; and 8 to 14 fans in operation. The results are illustrated in Figure 9. With 11 to 14 fans in operation, the reduction in parasitic energy demand associated with isolating a fan was essentially equal to the reduction in the gross output of the turbine due to an increase in the condenser pressure, and the net output of the plant remained nearly constant. However, with fewer than 11 fans in operation, the performance degradation due to the increase in the condenser pressure was larger than the savings in fan energy, and the net output decreased. For the purposes of the study, the fan power calculation assumed that all fans were in operation whenever the turbine was in operation at or near full load. 90 88 86 84 82 80 2.5 2.0 1.5 1.0 0.5 0.0 8 9 10 11 12 13 14 Fans in Operation, Each Output Pressure Figure 9 Plant Performance and Air Cooled Condenser Operation On a related point, the GateCycle calculations for fan power consumption are based on an air velocity at the entrance to the tube bank of 11.5 ft/sec. As such, the mass flow rate and fan power consumption are inversely related to the ambient air temperature. For example, with an ambient temperature of 40 °F, the - 16 - Net Cycle Output, MWe Condenser Pressure, lbf/in2PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis
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