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R134a : performance en ébullition convective à l'intérieur de tubes en cuivre à chevrons et à microailettes.

Convective boiling performance of refrigerant R134a in herringbone and microfin copper tubes.

Auteurs : BANDARRA FILHO E. P., SAIZ JABARDO J. M.

Type d'article : Article, Article de la RIF

Résumé

This paper reports an experimental investigation of convective boiling heat transfer and pressure drop of R134a in smooth, standard microfin and herringbone copper tubes of 9.52 mm external diameter. Tests have been conducted under the following conditions: inlet saturation temperature of 5 °C, qualities from 5 to 90%, mass velocity from 100 to 500 kg/s.m2, and a heat flux of 5 kW/m2. Experimental results indicate that the herringbone tube has a distinct heat transfer performance over the mass velocity range considered in this study. Thermal performance of the herringbone tube has been found better than that of the standard microfin in the high range of mass velocities, and worst for the smallest mass velocity (G= 100 kg/s.m2) at qualities higher than 50%. The herringbone tube pressure drop is higher than that of the standard microfin tube over the whole range of mass velocities and qualities. The enhancement parameter is higher than one for both tubes for mass velocities lower than 200 kg/s.m2. Values lower than one have been obtained for both tubes in the mass velocity upper range as a result of a significant pressure drop increment not followed by a correspondent increment in the heat transfer coefficient.

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Format PDF

Pages : 81-91

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    20 €

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Détails

  • Titre original : Convective boiling performance of refrigerant R134a in herringbone and microfin copper tubes.
  • Identifiant de la fiche : 2006-0670
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 29 - n. 1
  • Date d'édition : 01/2006

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