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Comment mesurer l'enthalpie de fusion d'un PCM d'hydrate de sel à fusion semi-congruente.
How to measure the melting enthalpy of semicongruently melting salt hydrate PCM.
Numéro : 1933
Auteurs : SCHMIT H., RUDALEVICIENE D., RATHGEBER C., HIEBLER S.
Résumé
Salt hydrates are attractive as phase change materials (PCM) and phase change slurries (PCS) due to generally higher volumetric melting enthalpies and lower costs than comparable organic materials. A disadvantage of some salt hydrates is the semicongruent melting, which can lead to phase separation. Therefore, it is difficult to obtain reliable values for the melting enthalpies of semicongruently melting salt hydrates, especially via differential scanning calorimetry (DSC), a widespread technology. As a remedy, a new method to obtain reliable values for the melting enthalpies of semicongruently melting salt hydrates is proposed. This new method consists in adding minimal amounts of known nucleating agents to samples measured via DSC. It is verified with the two semicongruently melting salt hydrates CaCl2·6H2O and K2HPO4·6H2O, attractive as PCM and PCS, respectively. The measured melting enthalpy of CaCl2·6H2O is (198 ± 8) J g-1, that of K2HPO4·6H2O is (154 ± 7) J g-1.
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Détails
- Titre original : How to measure the melting enthalpy of semicongruently melting salt hydrate PCM.
- Identifiant de la fiche : 30028841
- Langues : Anglais
- Sujet : Technologie
- Source : 13rd IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: (online) Vicenza, Italy, September 1-3, 2021.
- Date d'édition : 01/09/2021
- DOI : http://dx.doi.org/10.18462/iir.PCM.2021.1933
- Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.
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