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Condensation du frigorigène à faible GWP HFO1234ze dans un échangeur de chaleur à plaques brasées.

Condensation of the low GWP refrigerant HFO1234ze(E) inside a brazed plate heat exchanger.

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

Type d'article : Article, Article de la RIF

Résumé

This paper presents heat transfer coefficients and pressure drops measured during condensation of the low GWP refrigerant HFO1234ze(E) inside a BPHE. The condensation temperature ranges between 24.8 and 40.2 °C, the refrigerant mass flux from 10.7 to 39.9 kg m-2 s-1 and the heat flux from 5.3 to 26 kW m-2. 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-2 s-1) the heat transfer coefficients are independent of mass flux and condensation is gravity-dominated. For higher refrigerant mass fluxes (>20 kg m-2 s-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%–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%–6%) heat transfer coefficients and higher (10%) frictional pressure drops than those of HFC134a.

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Pages : 250-259

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Détails

  • Titre original : Condensation of the low GWP refrigerant HFO1234ze(E) inside a brazed plate heat exchanger.
  • Identifiant de la fiche : 30010365
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 38
  • Date d'édition : 02/2014

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