Modular Trough Power Plant Cycle and Systems Analysis

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Modular Trough Power Plant Cycle and Systems Analysis ( modular-trough-power-plant-cycle-and-systems-analysis )

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3.5 ORC Cost for Modular Trough Power Plant (MTPP) The installed capital cost for the power cycle side of a MTPP is estimated to be about $1,700 per kWe based on a preliminary analysis carried out by Barber-Nichols for a 1-MWe power plant (Appendix C). The major costs are associated with the turbine and the air-cooled condenser. The air-cooled condenser constitutes about 20% of the total capital cost, while turbine cost is about 45% of the total cost. The recuperator, which improves the cycle performance significantly, requires only 6% of the total cost, whereas the boiler requires about 15%. The remaining 14% of the capital cost is spent on installation, the pump, and other miscellaneous components. By creating modular designs, the goal is to develop packaged systems with an installed capital cost of less than $1,000/kWh. 4. Solar Technology Parabolic trough technology has proven to be a very mature solar technology for large-scale power generation. The nine SEGS parabolic trough power plants in the California Mojave Desert consist of 354 MWe of installed electric generating capacity that have been in operation for up to 17 years. The SEGS plants utilize steam Rankine cycle power plants. An overview of parabolic trough technologies can be found in the U.S. Department of Energy / Electric Power Research Institute, Technology Characterizations (U.S. Department of Energy, 1997) and the parabolic trough technology roadmap (Price and Kearney, 1999). 4.1 Parabolic Trough Collector Technology Two parabolic trough solar collector technologies have been considered for integration into the ORC plant. The first is the Luz second-generation collector known as the Luz System Two (LS- 2). A diagram of the LS-2 collector is shown in Figure 19. The second collector is the Industrial Solar Technology (IST) parabolic trough solar collector. Table 10 highlights the key design parameters of these two collectors. Both collectors have extensive field operational experience and have been tested at the National Solar Thermal Test Facility at Sandia National Laboratories in Albuquerque, New Mexico (Dudley et al., 1994 and 1995). Figure 20 shows the thermal performance of both collectors over a range of operating temperatures. 25

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