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Task 2 Wet/Dry Heat Rejection Analysis • A histogram of the hourly dry bulb temperatures, at direct normal radiation values above 250 W/m2, was assembled for Barstow. For each of the six models, the predicted turbine output and fan power demand at each of the 21 ambient temperatures in the histogram was multiplied by the number of hours at each temperature, and the outputs summed to estimate the annual plant performance. • Capital cost estimates for the air cooled condenser in each of the six models were developed. The relative economic benefits among the six models were plotted for a range of energy values between $60/MWhe and $140/MWhe to determine the sensitivity of the preferred initial temperature difference on the selling price of electric energy. • A second model of an 80 MWe Rankine cycle, this using a wet cooling tower, was developed with the GateCycle program. One case was developed, with a condenser cooling water temperature range of 22 °F and a cooling tower approach to the wet bulb temperature of 12 °F. • A histogram of the hourly dry bulb temperatures and coincident relative humidities, at direct normal radiation values above 250 W/m2, was assembled for Barstow. From these data, an equation relating dry bulb temperature and annual average relative humidity was developed. • Estimates of turbine output, cooling fan power, and water consumption for the wet heat rejection case were made for combinations of dry bulb temperatures between 40 °F and 130 °F and the corresponding relative humidities. From this, equations for estimating Rankine cycle performance were developed for use in the Excelergy computer program. The annual net electric output and water consumption of the plant were then estimated. • Estimates of the capital costs and the operating costs for the six plants with a dry heat rejection system, and the one plant with the wet heat rejection system, were developed. The costs were used as inputs to an annual cash flow analysis to determine the levelized energy costs for the seven cases. • For the dry heat rejection case with the lowest energy cost, additional GateCycle calculations were performed to estimate the turbine output if the maximum exhaust pressure was limited to 8 in. HgA during those periods in which the dry bulb temperature exceeded 110 °F. Equations of turbine output and fan power demand as a function of dry bulb temperature were incorporated in the Excelergy computer program, from which the annual net electric output and levelized energy cost were estimated. -2-PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis
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