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Experimental correlation of falling film absorption heat transfer on micro-scale hatched tubes.

Author(s) : PARK C. W., KIM S. S., CHO H. C., et al.

Type of article: Article, IJR article

Summary

The objectives of this paper were to investigate the effect of surface roughness of micro-hatching tubes on the absorption performance and to develop an experimental correlation of Nusselt number as a function of the roughness. Two different micro-scale hatched tubes and a bare tube were tested to quantify the effect of the surface roughness on the absorption performance. The roughness of the micro-scale hatched tubes ranges from 0.386 to 11.359 µm. The working fluid is a H2O/LiBr solution with inlet concentrations of 55, 58 and 61 wt.% of LiBr. The absorber heat exchanger consists of 24 horizontal tubes in a column, a liquid distributor at the liquid inlet and a liquid reservoir at the bottom of the absorber. It was found that the absorption performance of micro-hatching tubes was improved up to twofold compared with the bare tube. An experimental correlation of the Nusselt number was developed as a function of the film Reynolds number and the roughness, with an error band of ±25%.

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Pages: 758-763

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Details

  • Original title: Experimental correlation of falling film absorption heat transfer on micro-scale hatched tubes.
  • Record ID : 2004-1716
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 7
  • Publication date: 2003/11

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