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Solargenix also initiated full-scale wind load testing at the SEGS II plant owned by Sunray Energy. The data acquisition system and sensors were installed and calibrated during FY 2005. Wind testing will continue into FY 2006 because no high wind conditions were observed before the end of FY 2005. The field-scale testing is expected to validate the wind tunnel testing completed several years ago. New competitive contracts were awarded to Solargenix and Industrial Solar Technology (IST). The Solargenix contract includes activities to look at ways to further reduce the cost of the company’s current parabolic trough concentrator. They are conducting a design for manufacturing and assembly (DFMA) on the drive to reduce the part count and cost. They will develop a new design that increases the number of receivers on each collector module from two to three. They will look at increasing the length of the receivers by about 10% to 20%. They are also evaluating a separate concentrator design using a new hub structure, which could substantially reduce the number of pieces in their collector design. The IST contract develops a new parabolic trough concentrator design for electric applications that uses a structural design concept similar to the company’s solar process heat collector. The IST collector will use a concept where the mirrors rotate around a fixed receiver. The IST design appears to offer the potential for substantial cost savings while minimizing the need for flex hoses or ball joint assemblies. The key is whether they can develop a drive system and bearing design that works. Both of these contracts are structured as phased efforts under which the initial phase must demonstrate proof of concept before moving on to the second phase in FY 2006 (which includes field testing of prototypes). During FY 2005, SNL completed testing of the new Schott Glass parabolic trough receiver (see Fig 2). The Schott receiver represents a next- generation receiver design intended to improve the optical and thermal performance and reliability and lifetime of the receiver. The receiver demonstrated about a 30% lower thermal losses and a 5% improvement in optical efficiency over the Luz cermet receiver tested in 1993. In addition, in field-testing at SEGS, several hundred receivers have shown no failures after more than a year of operational service. Solar Thermal R&D Concentrating Solar Power Fig. 2. Schott receiver on test at the NSTTF NREL continued development of a new selective coating that appears to meet the long-term selective property goals for parabolic trough receivers (α ≥ 0.96 and ε ≤ 0.07 @ 400oC). During FY 2005, the coating was simplified by further modeling to reduce the number of materials required in the coating and to reduce the number of layers. Several test samples of the new coating were produced with the NREL vacuum deposition system. Initial deposition results were encouraging, but were not fully successful at accurately producing the modeled coating. Modifications to the vacuum deposition system have been initiated that will allow more accurate deposition of multi-layered cermet coating. During FY 2005, NREL developed a new technique for evaluating receiver thermal performance in operating solar fields using an infrared (IR) camera. The IR camera was used to survey approximately 12,000 receivers to help FPL Energy, the operator of seven of the SEGS plants, evaluate the condition of the receivers in the company’s solar fields. This effort helped FPL understand the extent of hydrogen build-up in the receivers in its solar fields, which can have a significant impact on overall plant performance. FY 2005 Milestones: • Complete testing of thermal receiver technology for next-generation CSP trough system. (12/04) • Placement of LOI trough solar field technology development subcontracts. (03/05) • Complete design of trough concentrator for next-generation CSP trough system. (06/05) • Prepare samples of new selective coating. (06/05). 116PDF Image | DOE Solar Energy Technologies Program
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