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Method of encapsulating a phase change material with a metal oxide

United States Patent

9,493,695
November 15, 2016
View the Complete Patent at the US Patent & Trademark Office
Storage systems based on latent heat storage have high-energy storage density, which reduces the footprint of the system and the cost. However, phase change materials (PCMs), such as NaNO.sub.3, NaCl, KNO.sub.3, have very low thermal conductivities. To enhave the storage of PCMs, macroencapsulation of PCMs was performed using a metal oxide, such as SiO.sub.2 or a graphene-SiO.sub.2, over polyimide-coated or nickel-embedded, polyimide-coated pellets The macro encapsulation provides a self-supporting structure, enhances the heat transfer rate, and provides a cost effective and reliable solution for thermal energy storage for use in solar thermal power plants. NaNO.sub.3 was selected for thermal storage in a temperature range of 300.degree. C. to 500.degree. C. The PCM was encapsulated in a metal oxide cell using self-assembly reactions, hydrolysis, and simultaneous chemical oxidation at various temperatures.
Ram; Manoj Kumar (Palm Harbor, FL), Jotshi; Chand K. (Gainesville, FL), Stefanakos; Elias K. (Tampa, FL), Goswami; Dharendra Yogi (Tampa, FL)
University of South Florida (Tampa, FL)
14/ 159,874
20140197355
January 21, 2014
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under Grant No. DE-EE0003590 awarded by the Department of Energy. The Government has certain rights in the invention.