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Evaporating heat transfer of R22 and R410A in horizontal smooth and microfin tubes.

Author(s) : KIM M. H., SHIN J. S.

Type of article: Article, IJR article

Summary

An experimental investigation of evaporating heat transfer in 9.52 mm O.D. horizontal copper tubes was conducted. The refrigerants tested were R22 and the near-azeotropic mixture, R410A. The test rig had a straight, horizontal test section with an active length of 0.92 m and was heated by the heat transfer fluid (hot water) circulated in a surrounding annulus. Constant heat flux of 11.0 kW/m2 was maintained and refrigerant quality varied from 0.2 to 0.8. The results were reported for evaporation at 15 °C in a 0.92 m long test section for 30-60 kg/h mass flow rate. The local and average heat transfer coefficients for seven microfin tubes were presented compared to those for a smooth tube. The average evaporation heat transfer coefficients of R22 and R410A for the microfin tubes were 1.86-3.27 and 1.64-2.99 times higher than those for the smooth tube, respectively. When compared to R22 at the same test conditions, the evaporating heat transfer coefficients for R410A were 97-129% of R22.

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Pages: 940-948

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Details

  • Original title: Evaporating heat transfer of R22 and R410A in horizontal smooth and microfin tubes.
  • Record ID : 2005-2468
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 6
  • Publication date: 2005/09

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