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Document IIF

Effet de l'huile sur la distribution de R134a dans un échangeur de chaleur [à microcanaux] à collecteur vertical.

Effect of oil on R134a distribution in the microchannel heat exchanger with vertical header.

Auteurs : ZOU Y., HRNJAK P. S.

Type d'article : Article, Article de la RIF

Résumé

This paper presents refrigerant R134a and oil (PAG 46) mixture upward flow in the vertical header of microchannel heat exchanger (compared to pure R134a and R410A), and its effect on distribution. The mixture enters into the header through the five tubes in the bottom pass and exits through the five tubes in the top pass representing the flow in the heat pump mode of outdoor heat exchangers in reversible systems. The quality was varied from 0.2 to 0.8 and the mass flow rate from 1.5 to 4.5 kg h-1 per tube. The oil circulation rate (OCR) was varied from 0% to 4.7%. It was found that at low OCR, e.g. 0.5%, the distribution was worse than pure R134a, whereas at high OCR, the distribution was improved and better than pure R134a in some cases. This was due to sufficient oil would create a lot of foams and enlarge the liquid region in the header based on the visualization.

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Format PDF

Pages : 201-210

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    20 €

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    Gratuit

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Détails

  • Titre original : Effect of oil on R134a distribution in the microchannel heat exchanger with vertical header.
  • Identifiant de la fiche : 30010715
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 40
  • Date d'édition : 04/2014

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