Abstract
Some aqueous salt solutions can be supersaturated by cooling to temperatures well below their normal crystallization temperatures. Such a solution in this metastable state stores a substantial fraction of the heat of solution, and this energy can be released with an accompanying temperature rise upon allowing the mixture to crystallize to its equilibrium state. We have determined the thermal energy storage capacity for supersaturated aqueous solutions of sodium ethanoate and sodium thiosulphate over a range of concentrations and from 0°C up to the temperature at which the salt completely dissolves. A maximum storage capacity of 174 kJ kg −1 at 30°C was observed for a sodium ethanoate solution in which the salt : water molar ratio was 1:4.
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