Share

IIR document

Investigations on the heat transfer of boiling binary refrigerant mixtures.

Author(s) : JUNGNICKEL H., WASSILEW P., KRAUS W. E.

Type of article: Article, IJR article

Summary

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.

Available documents

Format PDF

Pages: 129-133

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Investigations on the heat transfer of boiling binary refrigerant mixtures.
  • Record ID : 30000892
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 3 - n. 3
  • Publication date: 1980/05

Links


See other articles in this issue (6)
See the source

Indexing