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PERFORMANCE ANALYSIS OF THERMOCLINE ENERGY STORAGE

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PERFORMANCE ANALYSIS OF THERMOCLINE ENERGY STORAGE ( performance-analysis-thermocline-energy-storage )

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Proceedings of ISEC 2006 ASME International Solar Energy Conference July 8-13, 2006, Denver, CO ISEC2006-99005 PERFORMANCE ANALYSIS OF THERMOCLINE ENERGY STORAGE PROPOSED FOR THE 1 MW SAGUARO SOLAR TROUGH PLANT Gregory J Kolb Sandia National Laboratories Solar Systems Department Albuquerque, NM, 87123 USA (505) 844-1887(p), (505) 844-7786 (f) gjkolb@sandia.gov Vahab Hassani National Renewable Energy Laboratory ABSTRACT The 1 MW Saguaro solar parabolic trough power plant began operation in December 2005. The plant will initially operate without an energy storage system. However, recent studies predict a thermocline-type storage should be the most cost-effective storage concept for solar parabolic troughs power plants. If such a system can be successfully demonstrated at Saguaro, future trough plants will likely adopt this storage technology. A thermocline storage system for Saguaro has been proposed by Department of Energy (DOE) laboratories and the solar industry. In this paper, the time-dependent performance of the proposed storage system was evaluated with a new model of the plant based on the TRNSYS simulation system. Results indicate that the proposed system should work well at Saguaro. The paper describes the TRNSYS model and the engineering insights gleaned from annual performance simulations of the plant. INTRODUCTION The 1 MW Saguaro plant, owned by Arizona Public Service (APS), is the first new parabolic trough solar power plant to come on line in 15 years (Figure 1). The plant uses an organic Rankine power cycle (ORC), developed by Ormat Incorporated, with a maximum design-point operating temperature of 300 oC. This type of power cycle, which is routinely used in geothermal applications, allows smaller solar trough plants to be built and to be operated without need for onsite staff. The APS plant [13] is the first plant to use the new Fig. 1 The 10,300 m2 solar plant began delivering 1 MW of electricity to the APS grid on December 27, 2005. The plant is currently operating without energy storage. Solargenix parabolic trough collector. The trough, which was developed under the DOE USA Trough Initiative,1 integrates a number of technical improvements in the concentrator, drive and controls that reduce the cost and enhance the performance of the solar field. The plant is also the first application of the receiver tube of the German manufacturer Schott. The Schott 1 http://www.nrel.gov/csp/usa_trough.html 1 Copyright © 2006 by ASME

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