Systems Integration Of Containerized Molten Salt Thermal Energy Storage In Novel Cascade Layout

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ISBN 13 :
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Download or read book Molten Salt Thermal Energy Storage Systems written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A five-task research program aimed at the development of molten salt thermal energy storage systems commenced in June 1976. The first topical report, covering Task 1, the selection of suitable salt systems for storage at 850 to 1000°F, was issued in August 1976. It was concluded that a 35 Wt percent Li2CO3-65 Wt percent K2CO3 (LiKCO3) mixture was most suitable for the purpose. Interrelationships between various design parameters were examined using the available solutions, and an engineering-scale storage unit was designed. This unit has an annular configuration with a 1-ft OD, 1.5-ft high, 2-in. dia heat transfer well. Preliminary experiments on a pilot size (3-in. OD) unit showed that temperature profiles and progress of the solid-liquid interface agreed with those predicted theoretically. Also, no supercooling was observed during cooldown, and the presence of significant convective mixing was indicated by negligible temperature gradients. Use of a lithium aluminate volume-change suppressor was investigated, but it appears to be nonessential because of the low volume-change in the LiKCO3 system. Consideration of the relative heat-transfer resistances under practical conditions suggested that the use of a conductivity promoter will enhance the heat-transfer rates, thereby requiring smaller heat-transfer areas. Different configurations and materials were considered for this application; an aluminum wool appears to be most suitable. The corrosion resistance of various construction materials was investigated. Stainless steels and aluminum appear to be suitable construction materials for carbonates in the 850 to 1000°F range. Testing of the engineering-scale system (Task 3) and verification of the conclusions derived under Task 2 are in progress.