Share

IIR document

How to measure the melting enthalpy of semicongruently melting salt hydrate PCM.

Number: 1933

Author(s) : SCHMIT H., RUDALEVICIENE D., RATHGEBER C., HIEBLER S.

Summary

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.

Available documents

Format PDF

Pages: 7

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: How to measure the melting enthalpy of semicongruently melting salt hydrate PCM.
  • Record ID : 30028841
  • Languages: English
  • Subject: Technology
  • Source: 13rd IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: (online) Vicenza, Italy, September 1-3, 2021.
  • Publication date: 2021/09/01
  • DOI: http://dx.doi.org/10.18462/iir.PCM.2021.1933
  • Document available for consultation in the library of the IIR headquarters only.

Links


See other articles from the proceedings (49)
See the conference proceedings

Indexing