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Estimation des propriétés des coulis de glace à partir des propriétés de la solution aqueuse et d'équations simples.

Estimating properties of ice slurry from the properties of the aqueous solution and simple equations.

Auteurs : MELINDER Å.

Résumé

When aqueous solutions in an indirect refrigeration system are used below the freezing point as two-phase ice slurry it is not as easy to determine thermophysical properties needed for calculations as it is for single-phase liquids. One main reason is that ice particles in a system are not uniform and also change with time. Values obtained from measurements in lab rigs are strictly valid only for the batch in case and at that time. The author has in earlier papers presented equilibrium values of ice mass fraction, enthalpies and (average) ice slurry density, properties that are less dependent on these factors than dynamic viscosity and thermal conductivity. Results from experiments done in lab rigs have often been compared to what equations for liquids with solid particles give, such as Thomas equation for viscosity and the values may differ much. This paper presents viscosity and thermal conductivity and some other properties for ethyl alcohol and propylene glycol, based on fluid properties and mentioned equations. Diagrams help us compare the two fluids for certain operational temperatures and additive concentrations or initial freezing point temperatures. The relative differences between fluids and operational conditions will likely be similar to what real ice slurry in a real plant gives and this may give valuable clues for choice of fluid and suitable operational conditions.

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Format PDF

Pages : 2010-5

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Détails

  • Titre original : Estimating properties of ice slurry from the properties of the aqueous solution and simple equations.
  • Identifiant de la fiche : 2010-1494
  • Langues : Anglais
  • Source : 9th Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning. Proceedings: Sofia, Bulgaria, September 29-October 1, 2010.
  • Date d'édition : 01/09/2010

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