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Condensation du R134a et de ses substituts à faible GWP - R1234yf et R1234ze(E) - à l’intérieur d’un tube lisse horizontal de 4 mm.

R134a and its low GWP substitutes R1234yf and R1234ze(E) condensation inside a 4 mm horizontal smooth tube.

Numéro : pap. 2205

Auteurs : LONGO G. A., MANCIN S., RIGHETTI G., et al.

Résumé

This paper presents the comparative analysis of HFC134a and its low GWP substitutes HFO1234yf, and HFO1234ze(E) in saturated vapour condensation inside a 4 mm ID horizontal smooth tube. The experimental tests were carried out at 30, 35, and 40°C of saturation temperatures, with refrigerant mass flux in the range 100 - 600kg m-2s-1 at decreasing vapour quality. A transition point from gravity-dominated and forced convection condensation was found in the range of the equivalent Reynolds number 10,000 ? 20,000. The experimental heat transfer coefficients in the forced convection condensation regime were very well predicted by the Akers et al.
(1959) model, whereas the Friedel (1979) correlation was able to reproduce the frictional pressure drop data in the whole experimental range. HFO1234yf and HFO1234ze(E) exhibit heat transfer coefficients and frictional pressure drops similar to those of HFC134a and both the HFO refrigerants seem to be very promising as long-term low GWP substitutes for HFC134a.

Documents disponibles

Format PDF

Pages : 8

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 : R134a and its low GWP substitutes R1234yf and R1234ze(E) condensation inside a 4 mm horizontal smooth tube.
  • Identifiant de la fiche : 30024448
  • Langues : Anglais
  • Source : 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Date d'édition : 09/07/2018

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