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HFO-1234yf condensation inside a brazed plate heat exchanger.

Condensation du HFO-1234yf à l'intérieur d'un échangeur de chaleur à plaques brasées.

Numéro : pap. 2128

Auteurs : LONGO G. A., ZILIO C.

Résumé

This paper presents the heat transfer coefficients and the pressure drop measured during HFO-1234yf condensation inside a brazed plate heat exchanger: the effects of saturation temperature, refrigerant mass flux and vapour superheating 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/m2s) the heat transfer coefficients are not dependent on mass flux and condensation is controlled by gravity. For higher refrigerant mass flux (> 20 kg/m2s) 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. The frictional pressure drop shows a linear dependence on the kinetic energy per unit volume of the refrigerant flow and therefore a quadratic dependence on the refrigerant mass flux. HFO1234yf exhibits heat transfer coefficients lower (10-12%) and frictional pressure drop lower (10-20%) than those of HFC134a under the same operating conditions.

Documents disponibles

Format PDF

Pages : 8 p.

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : HFO-1234yf condensation inside a brazed plate heat exchanger.
  • Identifiant de la fiche : 30006320
  • Langues : Anglais
  • Source : 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 16/07/2012

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