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of the VSHOT parabolic dish concentrator slope measurement tool for use with short focal length parabolic trough concentrators. This required modifications to the VSHOT hardware and the control and analysis software. Budget allocations by task are provided below. These projects will be funded with both FY 2004 and FY 2005 funding. Two of the proposals include options for additional work in FY06 if funding allows. Laboratory support of parabolic trough solar field technologies included the thermal performance testing of new receivers. During FY 2004, SNL completed a number of upgrades to the rotating platform at the NSTTF that is used to conduct trough receiver thermal performance testing. These included upgrades to the wiring, data acquisition system, and thermal loop. The LS-2 collector on loan from KJC Operating Company was reinstalled on the platform, and efforts were made to accurately align mirrors and receivers. Preliminary test runs were made with the Solel UVAC receivers. This allowed new test staff to come up to speed and fine-tune testing procedures. NREL continued the development of advanced high temperature selective coatings. A new coating has been modeled that has potential to meet the long-term performance goals for receiver selective coating. 3.2 Thermal Energy Storage (TES) Technology SNL completed the thermal cycling test of filler material for use in a molten-salt thermal energy storage system operating at 450°C. The test used a ternary molten-salt mixture of calcium, sodium, and potassium nitrate. The filler material was composed of quartzite rock and silica sand. A test apparatus was developed that would allow a volume of rock and sand to undergo temperature cycles as volumes of hot (450oC) and cold (285oC) salt passed through. The test which ran for approximately 15 months validated that the filler material should be able to survive 10,000 temperature cycles, the number of cycles a commercial plant would see in a 30-year life. A detailed report (Brosseau, 2004) provides a description of the tests, summarizes the results, and provides recommendations for further study. A SunLab and industry team has developed a preliminary design for a thermocline storage system for the APS 1-MWe-trough plant currently under construction. The plant is being constructed without thermal energy storage, but in a way that Task Title Solar Field Technology Thermal Energy Storage Solar Power Plant Technologies Systems Integration *Carryover from FY 2003 3. Results and Accomplishments 3.1 Solar Field Technology FY 2004/CO* Budget ($K) 1,704/177 515/122 235/8 353/65 During FY 2004, Solargenix continued the development of its new parabolic trough concentrator and has completed the full prototype design. The structure used for thermal performance testing at SNL in FY 2003 was structurally load tested to failure. Based on this test, Solargenix has optimized the structural design for both perimeter and interior solar field locations. Designs have been completed for drive and end pylons. A new hydraulic drive system has been developed and tested. A new collector local controller has been developed and field-tested at one of the existing trough plants. Two collector modules have been provided for testing at a new Solargenix test facility in Nevada. Thermal performance testing of these collector modules will be completed during FY 2005. The wind load testing to be conducted as part of this effort is also planned for completion during FY 2005. The latest phase of the USA Trough Initiative LOI was issued in FY 2004 for near-term component manufacturing. Six companies responded with LOI. Three proposals were selected for award: • Solargenix: optimization of concentrator and receiver sizes, alternative concentrator design, drive system cost optimization. • Industrial Solar Technology: advanced concentrator design for power plant application. • Solutia: improved heat transfer fluid for use with thermal energy storage.PDF Image | FY 2004 ANNUAL REPORT DOE Solar
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