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Effet de la rugosité d’une surface sur le transfert de chaleur dans un système de stockage d’énergie thermique utilisant un coulis de matériau à changement de phase microencapsulé.

Effect of surface roughness on heat transfer in a thermal energy storage system employing microencapsulated phase change material slurry.

Numéro : pap. n. 1715

Auteurs : ALASFOOR O. F., SHERIF S. A.

Résumé

This study examines the effect of surface roughness on the heat transfer efficiency factor in a thermal energy storage system employing microencapsulated phase change material (MEPCM) slurry. The heat transfer efficiency factor is defined as the mean Nusselt number ratio for a MEPCM slurry with and without surface roughness. The model employed is applicable to a laminar and hydrodynamically fully developed MEPCM slurry flowing inside a tube using a two-dimensional convective heat transfer model. The surface roughness effect was incorporated into the model using a surface enlargement function defined as the surface area ratio of a MEPCM with and without surface roughness. A range of surface enlargement values were used to calculate the heat transfer efficiency factor under a host of conditions. Results show that as the surface roughness of the MEPCM’s increases, the heat transfer efficiency factor decreases. This result emphasizes the need to incorporate surface roughness into MEPCM slurry models in order to avoid over-predicting the heat transfer rate in such systems.

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Pages : 11

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Détails

  • Titre original : Effect of surface roughness on heat transfer in a thermal energy storage system employing microencapsulated phase change material slurry.
  • Identifiant de la fiche : 30026547
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.1715

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