Experimental correlation of falling film condensation on enhanced tubes with HFC134a; low-fin and Turbo-C tubes

Yong Tae Kang, Hiki Hong, Young Soo Lee

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


The objectives of this paper are to develop experimental correlations of heat transfer for enhanced tubes used in a falling film condenser, and to provide a guideline for optimum design of the falling film condenser with a high condensing temperature of 59.8 °C. Tests are performed for four different enhanced tubes; a low-fin and three Turbo-C tubes. The working fluid is HFC134a, and the system pressure is 16.0 bar. The results show that the heat transfer enhancement of low-fin tube, Turbo-C (1), Turbo-C (2) and Turbo-C (3) ranges 2.8-3.4 times, 3.5-3.8 times, 3.8-4.0 times and 3.6-3.9 times, respectively, compared with the theoretical Nusselt correlation. It was found that the condensation heat transfer coefficient decreased with increasing the falling film Reynolds number and the wall subcooling temperature. It was also found that the enhanced tubes became more effective in the high wall subcooling temperature region than in the low wall subcooling temperature region. This study developed an experimental correlation of the falling film condensation with an error band of ±5%.

Original languageEnglish
Pages (from-to)805-811
Number of pages7
JournalInternational Journal of Refrigeration
Issue number5
Publication statusPublished - 2007 Aug
Externally publishedYes


  • Air conditioning
  • Condensation
  • Correlation
  • Enhanced
  • Experiment
  • Falling film
  • Heat transfer
  • R134a
  • Refrigeration
  • Tube

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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