Abstract

AbstractThe behaviour of sodium thiosulphate pentahydrate in the course of repeated use as a heat‐storing medium can be predicted, cycle by cycle, on the basis of a generalised phase‐transition equation adapted for incongruently melting material. An indice is derived for this purpose and named ‘coefficient of true phase‐transition reversibility’. Its predictive value is shown for three additional incongruently melting materials well known as heat‐storing media: CaCl2.6H2O, Na2SO4.10H2O and the mixture Na2SO4.10H2O + 2/3NH4Cl + 2/3NaCJ.

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