An Experiment on the Heat Transfer to Substitute Refrigerant HFC134a Evaporating in a Horizontal Smooth Tube

Hiroshi Takamatsu, Satoru Momoki, Susumu Hiraoka, Haruo Nakada, Shigeru Koyama, Tetsu Fujii

研究成果: ジャーナルへの寄稿記事


An experiment is performed on the heat transfer to CFC12 and its alternative HFC134a evaporating in a 6m-long, 7.9mm-ID smooth tube. A double-tube-type evaporator, where heating water flows countercurrently, is used as the test section. A comparison of measured local heat transfer coefficient between HFC134a and CFC12 is made by adjusting the heat flux distributions for both fluids. Also, by a comparison between both fluids in heat transfer coefficient vs heat flux diagrams, the heat transfer coefficient of HFC134a is shown to be about 25% higher than that of CFC12 for the same saturation temperature, mass velocity, heat flux and quality. Correlations proposed by Dhar et al. and Yoshida et al. also give a higher heat transfer coefficient for HFC134a than that of CFC12, although the difference is a little smaller than that of the experimental results. From the standpoint of the heat transfer in the evaporator, HFC134a is adequate as an alternative working fluid for CFC12.

ジャーナルTransactions of the Japan Society of Mechanical Engineers Series B
出版物ステータス出版済み - 1 1 1991


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering