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The main parasitic electric loads are the motors for the heat transfer fluid (HTF) pumps, condensate/feedwater pumps, cooling water pumps, cooling tower fans, and boiler of heater forced draft fans. Additional parasitic loads are a result of instrumentation, controls, computers, valve actuators, air compressors, and lighting. The solar field also adds parasitic loads for the collector drives and communications. 4.2.7 • • A significant reduction in parasitic electric load for the near-term trough technology is based primarily on the replacement of flex hoses with balljoint assemblies in the solar field. These ball-joint assemblies reduce the pressure drop across the solar field by approximately 50%. The addition of thermal storage is also expected to reduce parasitics by spreading the station load over increased annual generation. A further reduction in pumping parasitics will occur when the switch is made to molten-salt HTF. Because of the higher density of molten salt, lower volumetric HTF flow rates, and thus less pumping power, are required. Power Plant Availability Availability accounts for forced and scheduled outages and deratings of the power plant. Typically, plant availability is only affected if solar energy collection/conversion is reduced by an outage or derating. • For the most part, the SEGS plants have demonstrated very high power plant availability. Normally, plants will take a 1- to 2-week outage during the winter to conduct required annual inspections and any corrective maintenance that cannot be accomplished during the normal daily operation. Every 10 years, a 5-week major turbine overhaul is conducted. During 1999, SEGS VI had a power plant availability of approximately 98% but did not take any planned scheduled maintenance outages during the year. • Future plants are conservatively assumed to have a 6% annual outage rate. This includes both scheduled and forced outages. If a higher temperature HTF and compatible thermal storage system can be developed and implemented in the mid-term, a 17.0% annual net solar-to-electric efficiency is feasible. Additional investigation and development of storage systems, including the optimum HTF for steam cycle efficiency and storage compatibility is required to achieve the mid-term efficiency projection. Long-term objectives will require continuing investigation and development of thermal storage systems and high temperature HTF. The long-term objectives will also necessitate an advanced HCE absorber coating for the projected 500°C operating temperature. 4-9 SL-5641 Final 4.2.6 Electric Parasitic LoadPDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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