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Caractéristiques de transfert de chaleur relatif à l'évaporation et à la chute de pression de R290 (propane), de R600 (butane), et d'une mélange de R290 et de R600 dans un serpentin muni de trois rangées de tubes de petite taille.

Evaporation heat transfer and pressure drop characteristics of R290 (propane), R600 (butane), and a mixture of R290/R600 in the three-lines serpentine small-tube bank.

Auteurs : WEN M. Y., HO C. Y.

Type d'article : Article

Résumé

This paper reports an experimental investigation of heat-transfer and pressure-drop behaviour of R290, R600, and R290/R600 in the three-lines serpentine small-diameter (2.46 mm) tube bank. Heat transfer coefficients and pressure drop characteristics are measured for a range of heat flux (5-21 kW/m2), mass flux (250-500 kg/m2.s), equilibrium mass quality (0-0.86), and the fixed mixture composition [R290/R600 (55 wt.%/45 wt.%)]. The results show that the flow boiling heat transfer coefficients for R290, R600, and R290/R600 are 1.66-1.96-fold, 1.28-1.38-fold and 1.57-1.88-fold greater as compared with those for R134a under equal heat and mass fluxes. Also, the two-phase flow frictional pressure drop for R600, R290/R600 and R290 are 1.41-1.60-fold, 1.32-1.50-fold and 1.22-1.40-fold smaller as compared with that for R134a. A new heat transfer correlation was presented by using a superposition model to predict the experimental data for both pure refrigerants and refrigerant mixtures. Experimental results were compared with several correlations which predict the evaporative heat transfer, which are in good agreement with experimental data.

Détails

  • Titre original : Evaporation heat transfer and pressure drop characteristics of R290 (propane), R600 (butane), and a mixture of R290/R600 in the three-lines serpentine small-tube bank.
  • Identifiant de la fiche : 2006-0577
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 25 - n. 17-18
  • Date d'édition : 12/2005

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