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substantially less ($10–$15/kWht). To achieve this • goal, the DOE R&D effort focuses on developing single-tank (thermocline) TES systems, application of TES systems in which 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). Specific activities during FY 2005 included: • Completion of a detailed design and cost estimate for a thermocline TES system for the APS 1-MWe parabolic trough plant. This system would be used to understand operational characteristics of a thermocline storage system in a commercial solar plant. • Use of TRNSYS software to develop models of the APS Saguaro plant, both without and with storage. The models without storage compared favorably with independent estimates by Solargenix. The model with storage is in close agreement with the Solar One power tower storage system. The TRNSYS model will be instrumental in determining the technical/economic feasibility of the APS plant with storage. • Developing advanced heat transfer fluids that would help reduce the cost of thermal energy storage and/or allow operation of trough plants at temperatures above 390oC. Two approaches are being pursued. The first looks at possible chemical modifications of the VP-1 components, i.e., biphenyl and diphenyl oxide, that would reduce the vapor pressure. The second approach looks at higher polyaromatic compounds and aromatic esters as potential high-temperature heat transfer fluids. 2.3 Solar Power Plant Technology During FY 2005, activities focused on supporting the development of the 1-MWe parabolic trough/Organic Rankine cycle power plant under development by APS and Solargenix, specifically development of a specialized database for tracking O&M costs and the detailed design and cost estimate of the TES. In addition, a contract was placed with Nexant to evaluate the cost penalty for dry cooling and to evaluate issues with scaling up the size of parabolic trough power plants to sizes larger than 100 MW. 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 2005 activities included: Upgrades to the VSHOT tool to increase the speed of field measurement of parabolic trough concentrators • Concept development, scoping, and feasibility for a new concentrator optical alignment tool • Installation of the two-axis tracker at the NREL mesa top facility • Installation of two Solargenix parabolic trough collector modules at the NREL optical testing laboratory and on the new two-axis tracker for development of a VSHOT optical testing tool. Budget allocations by task are provided below. Task Title Solar Field Technology Thermal Storage Technology Solar Power Plant Technology Trough Systems Integration *Carryover from FY 2004 3. Results and Accomplishments 3.1 Solar Field Technology FY 2005 /CO* Budget ($K) 1,070/475 535/0 140/0 480/0 115 During FY 2005, Solargenix continued the development and testing of its new parabolic trough concentrator. The final pre-commercial design was optically and operationally tested. Based on results from testing, the final design was completed and used in the 1-MWe parabolic trough plant built by Solargenix for APS near Tucson, Arizona (see Fig. 1). The new structure was optimized to further reduce cost and to improve field assembly. The design optimization resulted in a 16% weight reduction and an 11% reduction in the cost to manufacture the collector. The new design also resulted in a 41% reduction in the time required to assemble the space frames. Fig. 1. New APS solar power plant using Solargenix parabolic trough concentrator and Schott receiver Solar Thermal R&D Concentrating Solar PowerPDF Image | DOE Solar Energy Technologies Program
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