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Condensation du frigorigène à faible GWP HFC-1234yf à l'intérieur d'un échangeur de chaleur à plaques brasées.

Condensation of the low GWP refrigerant HFC-1234yf inside a brazed plate heat exchanger.

Auteurs : LONGO G. A., ZILIO C.

Type d'article : Article, Article de la RIF

Résumé

This paper presents the heat transfer coefficients and the pressure drop measured during condensation of the new low global warming potential (GWP) refrigerant HFO-1234yf inside a brazed plate heat exchanger: the effects of saturation temperature, refrigerant mass flux and vapour super-heating are investigated. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux. At low refrigerant mass flux (<20 kg/m2.s) the heat transfer coefficients are not dependent on mass flux and condensation is controlled by gravity. For higher refrigerant mass flux (>20 kg/m2.s) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. The condensation heat transfer coefficients of super-heated vapour are from 8 to 11% higher than those of saturated vapour. HFO-1234yf exhibits heat transfer coefficients lower (10–12%) and frictional pressure drop lower (10–20%) than those of HFC-134a under the same operating conditions.

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Pages : 612-621

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Détails

  • Titre original : Condensation of the low GWP refrigerant HFC-1234yf inside a brazed plate heat exchanger.
  • Identifiant de la fiche : 30007242
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 2
  • Date d'édition : 03/2013

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