Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6683441 | Applied Energy | 2016 | 9 Pages |
Abstract
Laboratory tests of two heat storage units based on the principle of stable supercooling of sodium acetate trihydrate (SAT) mixtures were carried out. One unit was filled with 199.5Â kg of SAT with 9% extra water to avoid phase separation of the incongruently melting salt hydrate. The other unit was filled with 220Â kg SAT mixture thickened with 1% carboxymethyl cellulose. The heat exchange capacity rate during the charging of the unit with the extra water was significantly higher than for the unit with the thickening agent due to the different levels of convection. The SAT mixtures in the units were stable and supercooled at indoor ambient temperatures for up to two months, after which the units were discharged. The energy discharged after solidification of the supercooled SAT and water mixture was 194Â kJ/kg in the first test cycle, dropping to 179Â kJ/kg after 20 test cycles. The energy discharged from the unit with SAT and the thickening agent after solidification was stable at 205Â kJ/kg over 6 test cycles.
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Authors
Mark Dannemand, Janne Dragsted, Jianhua Fan, Jakob Berg Johansen, Weiqiang Kong, Simon Furbo,