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Author
Ings, J. B. | Brown, P. W.
Title
Evaluation of Hydrated Calcium Aluminate Compounds as Energy Storage Media.
Coporate
National Bureau of Standards, Washington, DC
Sponsor
Department of Energy, Washington, DC
Report
NBSIR 82-2531, July 1982, 15 p.
Distribution
Available from National Technical Information Service
Keywords
calcium aluminum hydrates | calorimetry | dehydration | energy storage | rehydration | solar
Abstract
Calcium aluminate hydrates and calcium aluminate hydrates containing other ions were investigated to determine the feasibility of their utilization as energy storage media. A series of these compounds were fabricated and analyzed for purity. The energy liberated on hydration of each compound was measured using condiction calorimetry and the dehydration temperature was measured using differential scanning calorimetry. Of the compounds investigated, 3CaO Al²O³ 3CaSO⁴ 32H²O liberated the largest amount of energy upon rehydration. Initially, this value was about 100 cal/g. However, after 18 cycles of hydration and dehydration this value drops to about 70 cal/g.