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Données sur la chute de pression et méthode prévisionnelle pour l'ébullition externe améliorée du R-134a et du R-236fa sur des faisceaux de tubes.

Pressure drop data and prediction method for enhanced external boiling tube bundles with R-134a and R-236fa.

Auteurs : ROOYEN E. van, THOME J. R.

Type d'article : Article, Article de la RIF

Résumé

The pressure drops of external flow over enhanced tube bundles were experimentally obtained at both adiabatic and diabatic conditions using R-134a and R-236fa as test fluids. The tests were carried out at saturation temperatures of 5 and 15 °C, mass fluxes from 4 to 40 kg m-2 s-1, heat fluxes from 15 to 70 kW m-2 and inlet vapour qualities ranging from 10% to 90%. The frictional pressure drop was found to be primarily a function of mass flux and vapour quality. After comparisons were made with prediction methods in literature a new pressure drop prediction method was proposed for adiabatic and diabatic conditions. The proposed method is based on local measurements (4 and 8 tube rows) and flow conditions (evaluated per tube pitch) and the prediction method is well adapted to local incremental implementation for flooded evaporator design.

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Format PDF

Pages : 1669-1680

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    20 €

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Détails

  • Titre original : Pressure drop data and prediction method for enhanced external boiling tube bundles with R-134a and R-236fa.
  • Identifiant de la fiche : 30008699
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 6
  • Date d'édition : 09/2013

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