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• Nexant developed a detailed design and cost estimate for a thermocline thermal energy storage system for the APS 1-MWe trough plant, which will allow evaluation of the interaction among the solar field, thermal energy storage system, and the power plant. • SNL developed TRNSYS models of the APS plant to support decisions relative to the eventual implementation of thermal storage. Future Directions • Continue development of advanced receiver and concentrator technologies to meet long-term MYTP goals. • Support development of advanced thermal energy storage technologies. • Continue building laboratory capability to support trough testing and analysis. ________________________________________________________________________________ 1. Introduction energy funds. This effort focused on field-testing two full size collectors at a new test facility in Nevada and completing the design for the first commercial deployment of these collectors in the 1-MWe parabolic trough plant built for Arizona Public Service near Tucson, Arizona. During FY 2005, two proposals were awarded contracts from the FY 2004 USA Trough Initiative near-term component manufacturing solicitation: Solargenix Energy: optimization of concentrator and receiver sizes, alternative concentrator design, and drive system cost optimization. • Industrial Solar Technology: advanced Parabolic trough technology is currently the lowest cost central station solar power option and has the potential to become directly competitive with conventional power sources. 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 tobedeployedintheseearlyprojects.Asecond • 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 concentrator application. design for power plant with conventional fossil power plants. Although a number of technical approaches 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. In addition, 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 (MYTP): (1) solar field technology, (2) thermal energy storage technology, (3) solar power plant technology, and (4) 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 USA Trough Initiative and DOE Nevada renewable Solar Thermal R&D Concentrating Solar Power During FY 2005, SunLab support focused on: • Performance testing of the new Schott receiver at the SNL National Solar Thermal Testing Facility's (NSTTF) rotating platform • Continued development of advanced selective coating technologies for receivers, with the focus on developing coatings with improved thermo/optic properties and that are thermally stable in air up to 500oC • Developing approaches for assessment of receiver performance at operating plants and understanding potential hydrogen build-up in receivers. 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 will tolerate (approximately $30/kWht). The objective of the TES R&D effort is to develop the next generation of TES technology, which will cost 114PDF Image | DOE Solar Energy Technologies Program
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