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Task 3 Multiple Plants at a Common Site The unit operating costs for Case 4 were about 6 percent lower than for Case 3. The savings were derived in the following areas: 1) The labor efficiency for the solar field maintenance staff, excluding the manager and the foreman, and the solar field operations staff were both estimated to improve by 10 percent. The improvements were derived by sharing warehouse and maintenance facilities, and by using a smaller contingency in the number of maintenance workers required to handle the peak, as opposed to the average, work load in the collector fields. 2) The power plants operations staff was reduced by 8 percent by sharing the senior operators, the control room operators, and the plant equipment operators among the plants, and by locating the control operations for the four plants in one location. The number of staff for operations manager, assistant operations manager, and chemical technician remained unchanged. 3) The power plants maintenance staff was reduced by 8 percent by sharing the mechanics, the HTF mechanics, and the mechanics helpers among the plants, and by locating the warehouse and the maintenance facilities in one location. The number of staff for maintenance manager, plant maintenance foreman, electricians, instrumentation and control technicians, HTF mechanics helpers, machinist/ welder, warehouse clerk, and vehicle mechanic remained unchanged. 4) The annual expenses for plant service contracts, capital equipment for solar field maintenance, and miscellaneous expenses were each estimated to decrease by 5 percent due to the improvements in labor productivities noted above. The water treatment costs were also estimated to decrease by 5 percent due the higher annual thermal-to-electric conversion efficiencies for the Rankine cycles. However, as discussed in Section 3.3, the increase in the plant availability of 3.7 percent raised the annual output by a like amount, which resulted in a net reduction in the water treatment cost of about 1 percent. - 24 -PDF Image | Nexant Parabolic Trough Solar Power Plant Systems Analysis 2005
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