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Transfert de chaleur par condensation des frigorigènes à faible GWP R1234ze (E), R1234ze (Z) et R1233zd (E) sur un tube lisse horizontal.

Condensation heat transfer of low GWP refrigerants R1234ze(E), R1234ze(Z) and R1233zd(E) on a horizontal plain tube.

Numéro : pap. n. 165

Auteurs : NAGATA R., KONDOU C., KOYAMA S.

Résumé

In this study, the experimental data on heat transfer coefficient of free convective condensation on a horizontal plain tube are presented for R1234ze(E), R1234ze(Z), R1233zd(E), R134a and R245fa. Condensation experiment is conducted with a copper plain tube of 19.12 mm in outer diameter and 400 mm in the heat transfer length. The experiment covers saturation temperatures from 20 to 60°C and the degrees of wall subcooling from 0.77 to 28.81 K. The measured Nu of R1234ze(E) and R1234ze(Z) are agree with theoretical Nu equation within a bias of 6%. However, the experimental Nu of R1233zd(E) is biased +25%, on average, to the theoretical Nu. For more accurate HTC prediction, the sufficient transport property data would be needed for R1233zd(E).

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Pages : 8 p.

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Détails

  • Titre original : Condensation heat transfer of low GWP refrigerants R1234ze(E), R1234ze(Z) and R1233zd(E) on a horizontal plain tube.
  • Identifiant de la fiche : 30015331
  • Langues : Anglais
  • Source : Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
  • Date d'édition : 16/08/2015
  • DOI : http://dx.doi.org/10.18462/iir.icr.2015.0165

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