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Other Considerations There are several other considerations that may affect the selections. The supply chain that resulted in the original STORES plants have dwindled, and must be re-established. The expertise that resulted in several geothermal power plants has also dwindled. There are other suppliers that do build Organic Rankine systems for specialized uses, and these suppliers make lower temperature systems. If such systems are used, the plant performance may not be optimal, and this would need a trade-off between practicality and optimization. Cost Trade-Offs CAPITAL COSTS The capital cost of the solar field is directly proportional to the efficiency. As plant efficiency goes up, the size of the solar field is reduced. Furthermore, as plant efficiency increases, the size and cost of the condenser decreases. The three most expensive part of the power plant are the solar field, the turbine-generator and the condenser. Turbine- generator costs tend to remain relatively constant for the same power output, which means that the two governing costs are solar field and condenser. While there are some differences in the cost of working fluids, the overall cost of working fluid is minuscule relative to the overall cost of the plant and they may therefore be disregarded. O&M COSTS Another vital component of a STORES power plant is the O&M cost. In the U.S., by far the dominating O&M cost for the SEGS power plants is the cost of labor. A significant effort was put into reducing the O&M costs for a STORES power plant. The ORC Cascade cycle and the solar field both lend themselves to fully automatic operation with remote surveillance and control for handling problems. This automation will increase the capital costs but fortunately the costs related to Distributed Controls Systems and remote control have plummeted in the last few years, and will not be a major factor in the first STORES power plant. It is vital to the success of future STORES plants in the US that unlike the original SEGS plants, STORES plants must be fully automated. 28PDF Image | Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics
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