Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7046258 | Applied Thermal Engineering | 2018 | 8 Pages |
Abstract
Sodium acetate trihydrate (SAT) can be used as phase change material in latent heat storage with or without utilizing supercooling. The change of density from liquid to solid state leads to formation of cavities inside the bulk SAT during solidification. Samples of SAT which had solidified from supercooled state at ambient temperature and samples which had solidified with a minimal degree supercooled were investigated. The temperature dependent densities of liquid and the two types of solid SAT were measured with a density meter and a thermomechanical analyzer. The cavities formed inside samples of solid SAT, which had solidified after a high or minimal degree of supercooling, were investigated by X-ray scanning and computer tomography. The apparent density of solid SAT depended on whether it solidified from a supercooled state or not. A sample which solidified from a supercooled liquid contained 15% cavities and had a density of 1.26â¯g/cm3 at 25â¯Â°C. SAT which had solidified with minimal supercooling contained 9% cavities and had a density of 1.34â¯g/cm3 at 25â¯Â°C. The apparent densities of the solid SAT samples were significant lower than the value of solid SAT reported in literature of 1.45â¯g/cm3. The density of liquid and supercooled SAT with extra water was also determined at different temperatures.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Mark Dannemand, Monica Delgado, Ana Lazaro, Conchita Penalosa, Carsten Gundlach, Camilla Trinderup, Jakob Berg Johansen, Christoph Moser, Hermann Schranzhofer, Simon Furbo,