Survey of technology for storage of thermal energy in heat transfer salt

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The widespread use of nitrate-based fused salt mixtures as heat transport media in the petroleum and chemical process industries and in metallurgical heat-treatment operations has led to the development of satisfactory equipment for handling and containing these materials. A mixture known as heat transfer salt (HTS), which is composed of 40 percent NaNO/sub 2/, 7 percent NaNO/sub 3/, and 53 percent KNO/sub 3/ by weight, has been used commercially in large quantities as a heat transfer fluid. It has been suggested that this salt be used for storing energy as sensible heat in the temperature range 200 to 540/sup 0/C … continued below

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26 pages

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Silverman, M. D. & Engel, J. R. January 18, 1977.

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The widespread use of nitrate-based fused salt mixtures as heat transport media in the petroleum and chemical process industries and in metallurgical heat-treatment operations has led to the development of satisfactory equipment for handling and containing these materials. A mixture known as heat transfer salt (HTS), which is composed of 40 percent NaNO/sub 2/, 7 percent NaNO/sub 3/, and 53 percent KNO/sub 3/ by weight, has been used commercially in large quantities as a heat transfer fluid. It has been suggested that this salt be used for storing energy as sensible heat in the temperature range 200 to 540/sup 0/C (400 to 1000/sup 0/F). The eutectic 54 percent KNO/sub 3/--46 percent NaNO/sub 3/ by weight known as ''draw salt,'' which has undergone less testing but is more stable thermally and more attractive economically than HTS and has similar physical properties, may be a desirable alternative. Several specific energy storage applications, such as intermediate-load and peaking electric power, solar energy, and energy from fluidized-bed coal burners, are discussed. Long-term stability and corrosion data on these salts are presently available only to approximately 480/sup 0/C. However, for the design and construction of energy storage facilities to operate over many years at temperatures up to approximately 540/sup 0/C, long-term tests of thermal stability and corrosion are needed. Means for obtaining such information are proposed.

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  • January 18, 1977

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  • Feb. 10, 2019, 8:45 p.m.

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  • Jan. 22, 2021, 4:06 p.m.

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Silverman, M. D. & Engel, J. R. Survey of technology for storage of thermal energy in heat transfer salt, report, January 18, 1977; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc1446030/: accessed April 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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