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Condensation heat transfer and pressure drop of R32+R152a mixtures inside a horizontal internally helical-grooved small-diameter tube.

Number: pap. n. TP-062

Author(s) : INOUE N., ICHINOSE J., KURITA K.

Summary

In this paper, we conducted an experimental study on condensation heat transfer and pressure drop in a horizontal internally helical-grooved small-diameter tube with an outside diameter of 4.00 mm using pure R32, R152a and R32+R152a refrigerant mixtures. The experimental conditions were: refrigerant mass flux varied from around 320 to 750 kg/(m2•s); and pure R152a refrigerant and refrigerant mixtures with compositions of 70mass%R32+30mass%R152a (GWP 510), 60mass%R32+40mass%R152a (GWP 455), and 40mass%R32+60mass%R152a (GWP 344) were used. From the experimental results, we compared the experimental values of condensation heat transfer and pressure drop with previous values obtained for R32 and R410A refrigerants. In addition, we verified the usefulness of small-diameter tube for zeotropic refrigerants and assessed the applicability of our proposed correlations for experimental values of R152a and R32+R152a mixtures. The detail results are listed below: (1) The local heat transfer coefficient a in the refrigerant mixtures in this experiment did not differ much from the pure refrigerants R32 and R152a. (2) The pressure drop becomes larger when the composition of R152a is higher, and the pressure drop of R152a is about 2.5 to 3 times higher than R32 and R410A, respectively. (3) The pressure drop for the refrigerant mixture and R152a both have slightly higher values when Xn is large, however shows a good correlation within ±20% of the authors’ correlation formula. Also, heat transfer coefficients a are slightly higher for R152a, but the experimental values for the refrigerant mixture and R152a show a good correlation within about ±30% of the authors’ correlation formula.

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Pages: 8 p.

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Details

  • Original title: Condensation heat transfer and pressure drop of R32+R152a mixtures inside a horizontal internally helical-grooved small-diameter tube.
  • Record ID : 30008287
  • Languages: English
  • Source: 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
  • Publication date: 2013/06/17

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