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Optimisation d'un échangeur de chaleur à ailettes persiennées avec des angles variables de persiennes.

Optimization of louvered-fin heat exchanger with variable louver angles.

Auteurs : JANG J. Y., CHEN C. C.

Type d'article : Article

Résumé

The optimization of the variable louver angle (????) and initial louver angle (?i?i) for a louvered-fin heat exchanger was determined numerically using the conjugate gradient method. The area reduction ratio relative to a plain surface was the objective function to be maximized. A search for the optimal variable louver angle (????) and initial louver angle (?i?i), in the ranges of +0° < ???? < +4° and 18° < ?i?i < 30°, respectively, was performed. The results show that the maximum area reduction ratios are 48.5%–55.2% for the optimal design of (????, ?i?i) at ReH = 133–1199 (Uin = 1.0–9.0 m/s). In order to validate the reliability of the numerical simulation procedure, a comparison of experimental and numerical simulation results was made with the scaled-up testing. This article shows the temperature for the scaled-up louvered fin as determined from infrared thermovision and numerical simulation, respectively. A comparison of images shows that both methods give similar temperature distributions across the entire louvered fin. In addition, it shows comparisons of j and f between the simulation and experimental results. The results show good agreements, with a maximum discrepancy of 12%.

Détails

  • Titre original : Optimization of louvered-fin heat exchanger with variable louver angles.
  • Identifiant de la fiche : 30017144
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 91
  • Date d'édition : 05/12/2015
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2015.08.009

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