Partager

Document IIF

Solutions analytiques pour les échangeurs de chaleur à contre-courant soumis à un flux de chaleur externe et une conduction axiale.

Analytical solutions to counter-flow heat exchanger subjected to external heat flux and axial conduction.

Auteurs : AMINUDDIN M., ZUBAIR S. M.

Type d'article : Article, Article de la RIF

Résumé

A counter-flow heat exchanger with longitudinal conduction in separating wall is analyzed along with external heat flux. The inhomogeneous system of model equations is solved with the method of variation of parameters. Closed-form expressions are obtained for balanced flow with three types of wall end-conditions and the zero heat in-leak limit verified against reported expressions. In addition, analytical solution is derived for the general unbalanced flow model with non-adiabatic wall ends that is validated against the limiting case of no axial conduction. It enables examining property variations and arbitrary external load by dividing the system into smaller segments and applying the derived expressions to each element. Heat in-leak has higher impact on deterioration in the low NTU region studied when directed toward the hot fluid. As the external parasitic enhances with NTU, a critical NTU is noted in the range 2.8–5.1 for the various cases analyzed. At this optimum condition, the net energy reaching colder stages is between 27% and 55%.

Documents disponibles

Format PDF

Pages : 20-35

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Analytical solutions to counter-flow heat exchanger subjected to external heat flux and axial conduction.
  • Identifiant de la fiche : 30019966
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 74
  • Date d'édition : 02/2017

Liens


Voir d'autres articles du même numéro (56)
Voir la source

Indexation