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Comparative analysis of microfin vs smooth tubes in R32 and R410A condensation.

Author(s) : LONGO G. A., MANCIN S., RIGHETTI G., ZILIO C.

Type of article: IJR article

Summary

This study performs the comparative analysis of R32 and R410A condensation inside a 4.2 mm ID microfin tube: the effects of saturation temperature, vapour quality and mass velocities are evaluated.
The heat transfer coefficients show a great sensitivity to vapour quality, a non-negligible sensitivity to saturation temperature/pressure, and a non-monotonic trend versus mass velocity. The microfin tube exhibits a maximum heat transfer enhancement with respect to the smooth tube around 3.5−3.6 at a mass velocity of 200 kg m−2s−1 and a vapour quality of 0.8. The optimum mass velocity for R32 and R410A condensation inside the microfin tube is in the range 150−300 kg m−2s−1. R32 exhibits condensation heat transfer coefficients 20 − 30% higher and frictional pressure drops 10 − 20% higher than those of R410A and it seems a valuable low GWP substitute for R410A.

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Pages: 218-231

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Details

  • Original title: Comparative analysis of microfin vs smooth tubes in R32 and R410A condensation.
  • Record ID : 30028530
  • Languages: English
  • Subject: HFCs alternatives
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 128
  • Publication date: 2021/08
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.04.011
  • Document available for consultation in the library of the IIR headquarters only.

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