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Condensation heat transfer of a pure fluid and binary mixture outside a bundle of smooth horizontal tubes. Comparison of experimental results and a classical model.

Author(s) : BELGHAZI M., BONTEMPS A., SIGNE J. C., et al.

Type of article: Article, IJR article

Summary

The condensation of pure HFC-134a and different zeotropic mixtures with pure HFC-134a and HFC-23 on the outside of a bundle of smooth tubes was studied. The local heat transfer coefficient for each row was experimentally determined using a test section composed by a 13x13 staggered bundle of smooth copper tubes, measuring cooling water temperature in the inlet and the outlet of each tube, and measuring the vapour temperature along the bundle. All data were taken at the inlet vapour temperature of 40 °C with a small subcooling ranging from 4 to 26 K. The heat flux was varied from 5 to 30 kW/m2 and the cooling water flow rate from 120 to 300 l/h for each tube. The visualisation of the HFC-134a condensate flow by means of transparent glass tubes reveals specific flow patterns and explains the difference between the measured values of the heat transfer coefficient and the calculated values from Nusselt's theory. On the other hand, the experimental heat transfer data with the binary mixtures HFC-23-HFC-134a show the important effects data. The measured values with the different zeotropic mixtures were compared with the data calculated with the classical condensation model based on the equilibrium model. An improvement of this model is proposed.

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Pages: 841-855

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Details

  • Original title: Condensation heat transfer of a pure fluid and binary mixture outside a bundle of smooth horizontal tubes. Comparison of experimental results and a classical model.
  • Record ID : 2002-1262
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 24 - n. 8
  • Publication date: 2001/12

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