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Étude expérimentale et analytique du transfert de chaleur par condensation de CO2/R32 dans un microcanal.

Experimental and analytical investigation of CO2/R32 condensation heat transfer in a microchannel.

Auteurs : WANG P., LI M., DAI B., WANG Q., MA Y., DANG C., TIAN H.

Type d'article : Article de la RIF

Résumé

Previous research has shown that CO2 mixtures can improve the thermal performance of CO2 refrigeration systems. Moreover, the use of a microchannel heat exchanger can reduce the refrigerant charge and improve the heat transfer coefficient. Therefore, in this experimental study, we investigated the condensation heat transfer characteristics of CO2/R32 in a porous flat microchannel with a hydraulic diameter of 0.715 mm. According to the results, the convective heat transfer coefficient decreased rapidly then increased slowly with an increase in the CO2 mass fraction. The minimum value was achieved when the CO2 mass fraction was approximately 55%. In addition, the convective heat transfer coefficient decreased with an increase in the condensation temperature. Higher vapour quality and mass flow rate conditions corresponded to higher convective heat transfer coefficients. The prediction correlations applicable to the in-tube condensation heat transfer exhibited low prediction results for CO2/R32, with a heat transfer coefficient prediction error for the newly established prediction model of 16.77%. This study provides theoretical support for analysis of the CO2/R32 condensation heat transfer mechanism in microchannels and the future design of microchannel condensers.

Documents disponibles

Format PDF

Pages : 338-352

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 : Experimental and analytical investigation of CO2/R32 condensation heat transfer in a microchannel.
  • Identifiant de la fiche : 30030821
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 145
  • Date d'édition : 01/2023
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2022.08.023

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