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Document IIF

Condensation du HFO1234ze(E) à l'intérieur d'un échangeur de chaleur à plaques brasées.

HFO1234ze(E) condensation inside a brazed plate heat exchanger.

Numéro : pap. n. TP-015

Auteurs : LONGO G. A., ZILIO C., RIGHETTI G., et al.

Résumé

This paper presents heat transfer coefficients and pressure drops measured during condensation ofHFO1234ze(E), a low Global Warming Potential (GWP) refrigerant, inside a brazed plate heat exchanger for various values of saturation temperature, refrigerant mass flux and vapour super-heating. The heat transfer coefficients show weak sensitivity to saturation temperature and great sensitivity to refrigerant mass flux and vapour super-heating. At low refrigerant mass fluxes (< 20 kg m-2s-1) the heat transfer coefficients are independent of mass flux and condensation is gravity-dominated. For higher refrigerant mass fluxes (>20kg m-2s-1) the heat transfer coefficients depend on mass flux and forced convection condensation occurs. In the forced convection condensation region the heat transfer coefficients show a 32% to 35% enhancement for a doubling of the refrigerant mass flux. The condensation heat transfer coefficients of super-heated vapour are from 8% to 11% higher than those of saturated vapour. HFO1234ze(E) exhibits lower (4% to6%) heat transfer coefficients and higher (10% to 20%) frictional pressure drops than those of HFC134aunder the same operating conditions.

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Pages : 8 p.

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Détails

  • Titre original : HFO1234ze(E) condensation inside a brazed plate heat exchanger.
  • Identifiant de la fiche : 30008094
  • Langues : Anglais
  • Source : 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Date d'édition : 17/06/2013

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