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Écoulement du frigorigène et transfert de chaleur dans un système à énergie thermique latente à plusieurs fractions de volume de matériau à changement de phase (PCM) dans les cavités.

Fluid flow and heat transfer in a latent thermal energy unit with different phase change material (PCM) cavity volume fractions.

Auteurs : YE W., ZHU D.-S., WANG N.

Type d'article : Article

Résumé

In present work, the effects of different cavity volume fractions of phase change material (PCM) on fluid flow and heat transfer behavior in a latent thermal unit are studied numerically. The commercial Computational Fluid Dynamics (CFD) package, Fluent, is used for the numerical solution based on transient conjugate heat transfer. The numerical results have been verified and validated against numerical and experimental data available in published literature. The volume expansion ratio, the time of complete thermal storage, heat flux, liquid fraction, velocity and temperature fields are investigated for the range of PCM cavity volume fractions ø(max) from 35% to 95%. It is noted that a vortex (as a heat transfer enhancer) is present near the heating plate wall for the PCM cavity volume equal to 85%. It is found that the volume expansion ratio decreases as ø(max) increasing, whereas the time for complete energy storage increases. Further, the correlations of the volume expansion ratio and the time of complete thermal storage are developed as a function of ø(max). The detailed knowledge regarding interface heat transfer rate provides a deeper understanding the heat transfer mechanisms.

Détails

  • Titre original : Fluid flow and heat transfer in a latent thermal energy unit with different phase change material (PCM) cavity volume fractions.
  • Identifiant de la fiche : 30006011
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 42
  • Date d'édition : 09/2012
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2012.03.002

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