Abstract
Abstract In large latent heat storages with the phase change material (PCM) being a salt hydrate, it is difficult to assure the stoichiometrically correct hydrate concentration of the salt hydrate. In this study, the influence of the composition of CaBr 2 + H 2 O around the congruent melting CaBr 2 ·6H 2 O and CaCl 2 + H 2 O around the semi-congruent melting CaCl 2 ·6H 2 O on the maximum storage capacity is investigated via differential scanning calorimetry (DSC). For a CaBr 2 concentration around 0.8 wt% lower than the concentration of CaBr 2 ·6H 2 O, a decrease of over 17% is found for the maximum storage capacity. For a CaCl 2 concentration around 0.7 wt% lower than the concentration of CaCl 2 ·6H 2 O, a decrease of over 11% is found for the maximum storage capacity. While reproducible results for the maximum storage capacity for samples of the same concentration of CaBr 2 + H 2 O are obtained via DSC, this is not the case for the CaCl 2 + H 2 O samples. Thus, the difficulty to measure representative enthalpy curves of non-congruent melting salt hydrates via DSC is shown.
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