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Experimental investigations of R134a and R123 falling film evaporation on enhanced horizontal tubes.

Author(s) : ZHAO C. Y., JIN P. H., JI W. T., et al.

Type of article: Article, IJR article

Summary

Falling film evaporation is an efficient heat transfer mode in refrigeration and air conditioning industries. In this paper, the falling film evaporation performances of R134a and R123 outside four enhanced tubes and a smooth tube are tested. The results reveal that: with the decrease of film flow rate the falling film heat transfer coefficients of both R134a and R123 on the five tubes exhibit two general stages (a plateau stage and a sharp drop stage); for R134a the plateau is quite uniform while for R123 a mild decrease occurs with the decrease in film flow rate. The four enhanced tubes behave differently in heat transfer performances for R134a and R123. R134a provides around 2–3 times of heat transfer coefficients of R123 for all tubes.

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Pages: 190-203

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Details

  • Original title: Experimental investigations of R134a and R123 falling film evaporation on enhanced horizontal tubes.
  • Record ID : 30021925
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 75
  • Publication date: 2017/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2016.12.013

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