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Supercritical carbon dioxide Brayton Cycle

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Supercritical carbon dioxide Brayton Cycle ( supercritical-carbon-dioxide-brayton-cycle )

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unusually dense "supercritical" liquid at the point where it is held between the gas phase and liquid phase. The supercritical properties of carbon dioxide at temperatures above 500 C and pressures above 7.6 megapascals enable the system to operate with very high thermal efficiency, exceeding even those of a large coal-generated power plant and nearly twice as efficient as that of a gasoline engine (about 25 percent). In other words, as compared with other gas turbines the S-CO2 Brayton system could increase the electrical power produced per unit of fuel by 40 percent or more. The combination of low temperatures, high efficiency and high power density allows for the development of very compact, transportable systems that are more affordable because only standard engineering materials (stainless steel) are required, less material is needed, and the small size allows for advanced-modular manufacturing processes. "Sandia is not alone in this field, but we are in the lead," Wright said. "We're past the point of wondering if these power systems are going to be developed; the question remains of who will be first to market. Sandia and DOE have a wonderful opportunity in the commercialization effort." Sandia's S-CO2 Brayton cycle program is supported by DOE with funding from the Labs' Laboratory Directed Research & Development (LDRD) program. Provided by Sandia National Laboratories This document is subject to copyright. Apart from any fair dealing for the purpose of private study, research, no part may be reproduced without the written permission. The content is provided for information purposes only. "Supercritical carbon dioxide Brayton Cycle turbines promise giant leap in thermal-to-electric conversion efficiency." PHYSorg.com. 4 Mar 2011. http://www.physorg.com/news/2011-03-supercritical-carbon-dioxide-brayton-turbines.html Page 2/2

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