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Etude du K2HPO4·6H2O comme coulis à changement de phase (CCP).

Investigation of K2HPO4·6H2O as phase change slurry (PCS).

Numéro : pap. 26

Auteurs : SCHMIT H., FRANK M., RATHGEBER C., et al.

Résumé

K2HPO4·6H2O (potassium hydrogen phosphate hexahydrate) is a salt hydrate with a melting temperature around 14 °C. It shows an acceptable crystallisation speed until a crystal size of around 1 mm is reached after which the crystal growth virtually stops. For its usage as PCS in applications, basic material properties need to be determined. The melting enthalpy of K2HPO4·6H2O determined via T-History is (156 ± 8) J g-1. Density measurements of both the solid and the liquid phase reveal a volume change from liquid to solid of around -3%. Due to this small volume change, the determination of the crystal fraction is in K2HPO4·6H2O slurry difficult. In our work, the possibility of using a turbidity sensor to determine the crystal fraction is investigated and the recording of a calibration curve is achieved up to a crystal fraction of around 7 wt%.

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Pages : 9

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Détails

  • Titre original : Investigation of K2HPO4·6H2O as phase change slurry (PCS).
  • Identifiant de la fiche : 30017903
  • Langues : Anglais
  • Source : 11th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Karlsruhe, Germany, May 18-20, 2016.
  • Date d'édition : 18/05/2016
  • DOI : http://dx.doi.org/10.18462/iir.pcm.2016.0026

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