Abstract

AbstractThe operating behaviour of a new salt hydrate mixture in a pilot heat storage unit using direct contact heat exchange has been investigated. The new storage medium is based on diluted Glauber's salt in which the excess water has been replaced by Na2HPO4 ṁ 12H2O as an active participant in the storage process.Improved heat storage properties have been found with the new salt mixture. Sampling of the salt solution and deposited crystals during operation indicated that alternate independent crystallization of Glauber's salt and of the phosphate salt occurs. Simulations of the crystallization behaviour based on this assumed mechanism are described.

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