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A simple heat-transfer model for condensation on low-finned tubes.

Author(s) : ROSE J. W.

Summary

An approximate algebraic equation for predicting the vapour-side enhancement, and hence the vapour-side heat-transfer coefficient, for condensation on low-finned tubes was developed. The approach takes account of both gravity and surface tension. An original equation was strictly applicable only to rectangular-section fins of high thermal conductivity. The model has now been amended to include trapezoidal-sections fins and an iterative approximate procedure has been used to incorporate "fin-efficiency-effects". When the temperature drop in the fins was neglected the model was able to predict optimum fin spacing for fixed values of fin thickness and fin height. When fin efficiency effects were included, both optimum spacing and thickness could be predicted. For refrigerants, the model indicates that the performance improves continuously with increase in fin height to values of fin height beyond the practical range. Results of calculations are presented for R11 and R123.

Details

  • Original title: A simple heat-transfer model for condensation on low-finned tubes.
  • Record ID : 1995-0121
  • Languages: English
  • Source: Proceedings of international seminar on heat transfer, thermophysical properties and cycle performance of alternative refrigerants.
  • Publication date: 1993/12/06
  • Document available for consultation in the library of the IIR headquarters only.

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