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Flow condensation heat transfer coefficients of R22, R134a, R407C, and R410A inside plain and microfin tubes.

Author(s) : JUNG D., CHO Y., PARK K.

Type of article: Article, IJR article

Summary

Flow condensation heat transfer coefficients (HTCs) of R22, R134a, R407C, and R410A inside horizontal plain and microfin tubes of 9.52 mm outside diameter and 1 m length were measured at the condensation temperature of 40 °C with mass fluxes of 100, 200, and 300 kg m-2 s-1 and a heat flux of 7.7-7.9 kW m-2. For a plain tube, HTCs of R134a and R410A were similar to those of R22 while HTCs of R407C are 11-15% lower than those of R22. For a microfin tube, HTCs of R134a were similar to those of R22 while HTCs of R407C and R410A were 23-53% and 10-21% lower than those of R22. For a plain tube, our correlation agreed well with the present data for all refrigerants exhibiting a mean deviation of 11.6%. Finally, HTCs of a microfin tube were 2-3 times higher than those of a plain tube and the heat transfer enhancement factor decreased as the mass flux increased for all refrigerants tested.

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Pages: 25-32

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Details

  • Original title: Flow condensation heat transfer coefficients of R22, R134a, R407C, and R410A inside plain and microfin tubes.
  • Record ID : 2004-0555
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 1
  • Publication date: 2004/01

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