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Étude sur le coefficient de transfert de chaleur par condensation du R1234ze(E) et du R134a à proximité du point critique.

A study on the condensation heat transfer coefficient of R1234ze(E) and R134a near the critical point.

Auteurs : JEONG J.

Type d'article : Article de la RIF

Résumé

Industrial heat pumps have been developed to recycle surplus heat from various industrial processes for steam generation. A condenser in an industrial heat pump needs to meet the high condensation temperature. Alternative refrigerants are also needed for condensers. The objective of this study was to compare condensation heat transfer characteristics of R1234ze(E), an alternative refrigerant at high reduced pressure, and R134a, a conventional refrigerant. A test section of copper tube with a diameter of 1/2 inch and a length of 4 m was used. The test section was installed inside a PVC tube which was cooled with brine. Experimental conditions were: reduced pressure from 0.5 to 0.7 and mass flux of 500–600 kgm-2s-1. Condensation heat transfer coefficients of R1234ze(E) and R134a decreased with an increase in reduced pressure. Effects of mass flux on refrigerants decreased with an increase in reduced pressure. A Travis model showed the best performance for estimating condensation heat transfer coefficients of R1234ze(E) and R134a under high reduced pressure conditions.

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Format PDF

Pages : 83-94

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : A study on the condensation heat transfer coefficient of R1234ze(E) and R134a near the critical point.
  • Identifiant de la fiche : 30028519
  • Langues : Anglais
  • Sujet : Technologie, Alternatives aux HFC
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 128
  • Date d'édition : 08/2021
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2021.03.018
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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