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Document IIF

Etudes sur la transmission de chaleur des mélanges de fluides frigorigènes binaires en ébullition.

Investigations on the heat transfer of boiling binary refrigerant mixtures.

Auteurs : JUNGNICKEL H., WASSILEW P., KRAUS W. E.

Type d'article : Article, Article de la RIF

Résumé

Heat transfer during nucleate pool boiling was experimentally determined for the mixtures R-12/R-113, R-22/R-12, R-13/R-12, R-13/R-22 and R-23/R-13. For purposes of comparison, the respective five pure refrigerants were also investigated. Dependent upon the mixture, the measurements were made at boiling pressures of p=0.1 to 2 MPa within the temperature region of t=198 to 333 K (-75° to +60°C) and at heat fluxes of Q=4x10^3 to 10^5 W*m-2. A horizontal, electronically heated copper plate with A=3 cm2 was used. The following quantities were measured: pressure; temperature difference between the heating surface and the boiling liquid; composition and temperature in the liquid and vapour phases; and heat flow rate. The mean error of the heat transfer coefficients found was ±5%. The results clearly show that the heat transfer for an evaporating mixture deteriorates as compared to the pure components. Essential parameters influencing this reduction are pressure, difference between vapour and liquid composition and heat flux. The fundamental relations and characteristic differences between the individual mixtures are illustrated by figures. The heat transfer coefficients measured can be represented within the whole region studied by a modified relation according to Körner. Observation of the process of evaporation has shown that by agitation (increase of convection) the heat transfer in mixtures can be improved. Additional experiments with evaporation during fluid flow in a pipe are presently in progress.

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Format PDF

Pages : 129-133

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    20 €

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Détails

  • Titre original : Investigations on the heat transfer of boiling binary refrigerant mixtures.
  • Identifiant de la fiche : 30000892
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 3 - n. 3
  • Date d'édition : 05/1980

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