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Experimental correlation of pool boiling heat transfer for HFC-134a on enhanced tubes: Turbo-E.

Author(s) : YANG S. W., JEONG J., KANG Y. T.

Type of article: Article, IJR article

Summary

The objectives of this paper are to study the heat transfer characteristics for enhanced surface tubes in the pool boiling and to provide a guideline for the design conditions for the evaporator using HFC-134a. The shape of tube surfaces, the wall superheat, and the saturation temperature are considered as the key parameters. Copper tubes are treated with different helix angles and the saturation temperatures are controlled from 3 to 16°C. It is found that the pool boiling heat transfer coefficient decreases with increasing the wall superheat. It is also found that boiling heat transfer coefficients for Turbo-II and Turbo-III are 1.5-3.0 and 1.2-2.0 times higher than that for Turbo-I without the helix angle, respectively. The higher heat transfer performance from Turbo-II and Turbo-III can be explained by the ''bubble detention'' phenomenon on the surface without the helix angle for the Turbo-I. The experimental correlations for the pool boiling heat transfer on the present enhanced tubes without (Type I) and with the helix angle (Type II and Type III) are developed with the error bands of plus or minus 30%, respectively.

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Pages: 130-137

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Details

  • Original title: Experimental correlation of pool boiling heat transfer for HFC-134a on enhanced tubes: Turbo-E.
  • Record ID : 2008-0604
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 1
  • Publication date: 2008/01

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