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1. Introduction Parabolic trough technology represents the lowest cost central station solar power option. As a result there is growing interest in the U.S. Southwest to deploy more of these types of plants. In the near- term, the objective of the parabolic trough R&D program is to advance technologies that have an opportunity to be deployed in these early projects. A second objective is to encourage expanded U.S. supply in these early plants. The longer-term objective is to encourage the development of advanced technologies that will help improve the competitiveness of future parabolic trough plants with conventional fossil power plants. Although there are a number of technical approaches that could be undertaken to support these objectives, the focus of the DOE program is to encourage U.S. supply of the solar collector technology, improve the parabolic trough receiver, and to support the development of advanced thermal storage technologies. Additionally, the program is working to develop improved tools, testing capabilities, and the technology knowledge-base necessary to support the needs of a growing U.S. parabolic trough industry. 2. Technical Approach The parabolic trough R&D effort is broken into four areas in the DOE Solar Program Multi-Year Technical Plan. These are solar field technology, thermal energy storage technology, solar power plant technology, and systems integration. 2.1 Solar Field Technology The primary solar field technology activity was the continuation of the Solargenix Energy parabolic trough collector development under the DOE USA Trough Initiative. This effort focused on completing the design of the new Solargenix concentrator and field testing two full size collectors at a new test facility in Nevada. Lab support focused on performance testing of the new Schott receiver at the SNL National Solar Thermal Testing Facility's (NSTTF) rotating collector platform. Lab R&D efforts also continued the development of receiver advanced selective coating technologies. The focus is on developing selective coating with improved thermal/optic properties and that are thermally stable in air up to 500°C. 2.2 Thermal Energy Storage (TES) Technology The SunLab TES program is responsible for the development of the indirect 2-tank molten-salt TES system that will be used in several parabolic trough solar plants under development in southern Spain. Unfortunately this TES technology is still more expensive than the U.S. power market needs (approximately $30/kWht). The objective of the TES R&D effort is to develop the next generation of TES technology what will cost substantially less ($10-15/kWht). The DOE R&D effort focuses on developing single tank (thermocline) TES systems, application of direct molten-salt TES systems where inorganic molten-salt is used directly in the solar field, and on the development of advanced new heat transfer fluids that will lower the cost of the TES system (using either indirect or direct TES designs). During FY 2004 specific activities included the completion of a multi-year thermal-cycling test of the filler material for a single tank thermocline TES system, the development of the design for a thermocline TES system for the Arizona Public Service (APS) 1-MWe test that could be used to understand operational considerations of a thermocline storage system in a commercial solar plant, and identification of new fluid families that might be used as a HTF in parabolic trough plants. 2.3 Solar Power Plant Technology During FY 2004 the primary activities focused on supporting the development of the 1-MWe parabolic trough/Organic Rankine cycle power plant underdevelopment by APS and Solargenix. SunLab participated in the design review process, acting as a technical consultant to APS. SunLab also supported the development of an O&M database for tracking O&M costs of the plant once it begins operation in 2005. The O&M database is an adaptation of a database that SNL developed for tracking O&M costs of PV systems that APS currently uses. 2.4 Systems Integration This activity focuses on the development of systems integration tools for evaluation of trough technologies and assessment of program activities. Specific FY 2004 activities include the adaptationPDF Image | FY 2004 ANNUAL REPORT DOE Solar
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