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Effect of oil on heat transfer characteristics of R410A flow boiling inside small diameter microfin tubes.

Number: pap. ID: 193

Author(s) : HU H. T., DING G. L., GAO Y. F., et al.

Summary

Experiments of R410A-oil mixture flow boiling inside horizontal small diameter microfin tubes with outside diameters of 4.0 and 5.0 mm were performed. The experimental results show that, at vapor qualities lower than 0.8, the oil enhances heat transfer by a maximum of 37 and 26% for 5.0 mm and 4.0 mm microfin tubes, respectively; while at vapor quality higher than 0.8, the oil deteriorates heat transfer by a maximum of 20 and 7% for 5.0 and 4.0 mm microfin tubes, respectively; the decrease of tube diameter from conventional size to small diameter may weaken the deterioration effect of oil on heat transfer at intermediate and high vapour qualities. A new heat transfer correlation for R410A-oil mixture flow boiling inside conventional size and small diameter microfin tubes was developed, and it agrees with 94% of the experimental data in 4.0-7.0 mm microfin tubes within a deviation of ±30%.

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Pages: 8 p.

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Details

  • Original title: Effect of oil on heat transfer characteristics of R410A flow boiling inside small diameter microfin tubes.
  • Record ID : 30001624
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21

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