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Coefficient du transfert de chaleur lors de l'ébullition en écoulement d'un mélange R134a/R290/R600a dans des tubes horizontaux lisses utilisant une méthode de flux thermique variable.

Flow boiling heat transfer coefficient of R134a/R290/R600a mixture in smooth horizontal tubes using varied heat flux method.

Auteurs : RAJA B., LAL D. M., SARAVANAN R.

Type d'article : Article

Résumé

An experimental study on in-tube flow boiling heat transfer of R134a/R290/R600a refrigerant mixture has been carried out under varied heat flux test conditions. The heat transfer coefficients are experimentally measured at temperatures between -8 and 5°C for mass flow rates of 3-5 g/s. Acetone is used as a hot fluid which flows in the outer tube of diameter 28.57 mm while the refrigerant mixture flows in the inner tube of diameters 9.52 and 12.7 mm. By regulating the acetone flow conditions, the heat flux is maintained between 2 and 8 kW/m2 and the pressure of the refrigerant is maintained between 3.2 and 5 bars. The comparison of experimental results with the familiar correlations shows that the correlations over predict the heat transfer coefficients for this mixture when stratified and stratified-wavy flow prevail. Multiple regression technique is used to evolve and modify existing correlations to predict the heat transfer coefficient of the refrigerant mixture. It is found that the modified version of Lavin-Young correlation (1965) predicts the heat transfer coefficient of the considered mixture within an average deviation of plus or minus 20.5%. [Reprinted with permission from Elsevier. Copyright, 2008].

Détails

  • Titre original : Flow boiling heat transfer coefficient of R134a/R290/R600a mixture in smooth horizontal tubes using varied heat flux method.
  • Identifiant de la fiche : 2009-1926
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 29 - n. 8-9
  • Date d'édition : 06/2009
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2008.08.009

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