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ES-8 SL-5641 Final factors slightly more conservative than the industry average. The risk of achieving the cost improvements from volume production projected by S&L is low based on the cost reduction experience from the SEGS plants. Key Trough Technology Conclusions A number of key technology advances will cause near-term trough plants to be a significant improvement over the SEGS units. These include: • Development of the new Solel UVAC receiver, improving collector field thermal performance by 20%. • Development of a near-term thermal storage option for troughs by Nexant and SunLab. The design is likely to be demonstrated at the first trough plant to be built in Spain. • Replacement of flex hoses with ball joint assemblies in the collector field, significantly reducing HTF pumping parasitics and increasing the potential size of future parabolic trough solar fields. The development of longer-term, more advanced thermal storage technologies is critical. This path offers the largest cost reduction potential, as follows. • Integral with advanced thermal storage is the implementation of a higher temperature heat transfer fluid in the 450°–500°C range. (SunLab and international R&D groups have significant efforts underway.) • However, increasing trough-operating temperature to 500°C appears to have minimal impact on the eventual LEC compared to 450°C. This is contrary to earlier conclusions, necessitating a more detailed assessment in the near future. Significant cost reductions appear reachable in all three key trough components—structure, receiver, and reflectors—though brought about by different cost reduction mechanisms. • Concentrator cost reduction will depend largely on size scale-up, production volume, and increased competition. (Significant industrial efforts are currently in progress by Duke Solar & EuroTrough.) • Alternative reflector (mirror) options and production volume are projected to drop costs significantly. • Achieving an operating temperature of 450°C with current receiver technology appears feasible. However, the development of a higher performing and more reliable receiver is very important to achieve SunLab long-term cost and performance goals (labs and industry are addressing this). O&M procedures are expected to continue downward with scale-up, increasing field experience, and technology improvements in reliability.PDF Image | Assessment of Parabolic Trough and Power Tower Solar Technology Cost and Performance Forecasts
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