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Document IIF

Examiner des tubes lisses à micro-ailettes avec ébullition en écoulement diphasique horizontal et utilisant les frigorigènes R-1234ze et R-134a.

Investigating micro-fin and smooth tubes in horizontal two-phase flow boiling using R-1234ze and R-134a refrigerants.

Auteurs : ABDUL K., WANG C.

Résumé

Global warming is becoming a major issue to the environmental perspective of view and one of the several causes is the release of refrigerants to the atmosphere. This research investigates refrigerant R-1234ze that is considered to substitute R-134a. A microfin and smooth tube with 9.5mm outer diameter was used in a two-phase flow horizontal convective boiling to study the pressure drop and the enhancement of heat transfer coefficients. The brazed microfin inside a stainless steel tube was heated electrically with current. Thermocouples were inserted in the wall to measure the temperature distribution. The measurements were carried out at saturation temperature of 20°C by varying the refrigerant mass velocity between 50 kg/m2s and 200 kg/m2s, the vapor quality from 0.1 to 0.9, at different heat fluxes. Results from the two refrigerants and tubes were analyzed and compared basing on the values of the two-phase heat transfer coefficient and pressure drop.

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Format PDF

Pages : 8

Disponible

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    20 €

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Détails

  • Titre original : Investigating micro-fin and smooth tubes in horizontal two-phase flow boiling using R-1234ze and R-134a refrigerants.
  • Identifiant de la fiche : 30017538
  • Langues : Anglais
  • Source : 4th IIR International Conference on Sustainability and the Cold Chain. Proceedings: Auckland, New Zealand, April 7-9, 2016.
  • Date d'édition : 07/04/2016
  • DOI : http://dx.doi.org/10.18462/iir.iccc.2016.0014

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