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Etude expérimentale du transfert de chaleur lors de l'évaporation et de la chute de pression de l'ammoniac dans un échangeur à plaques à chevrons (30°).

Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger.

Auteurs : KHAN M. S., KHAN T. S., CHYU M. C., et al.

Type d'article : Article, Article de la RIF

Résumé

Ammonia, an environment friendly natural refrigerant with attractive thermo-physical properties is a potential replacement of the synthetic refrigerants with high ozone depletion and global warming potentials. Experimental heat transfer and pressure drop data are obtained for two phase evaporation of ammonia in a commercial plate heat exchanger for symmetric 30°/30° chevron plates. The plate heat exchanger was configured in a single pass U-type counter flow arrangement with liquid ammonia evaporating in upward flow direction and glycol/water solution simulating the heat load in counter flow. Experiments were carried out for saturation temperatures ranging from -25 to -2°C. The heat flux was varied between 21 and 44 kW/m2. Experimental results show significant effect of saturation temperature, heat and exit vapor quality on heat transfer coefficient and pressure drop. Two phase Nusselt number and friction factor correlations are proposed.

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Format PDF

Pages : 1757-1765

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    20 €

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    Gratuit

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Détails

  • Titre original : Experimental investigation of evaporation heat transfer and pressure drop of ammonia in a 30° chevron plate heat exchanger.
  • Identifiant de la fiche : 30004856
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 35 - n. 6
  • Date d'édition : 09/2012

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