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The effect of heat transfer additive and surface roughness of micro-scale hatched tubes on absorption performance.

Author(s) : PARK C. W., CHO H. C., KANG Y. T.

Type of article: Article, IJR article

Summary

The objectives of this study were to investigate the effect of heat transfer additive and surface roughness of micro-scale hatched tubes on the absorption performance and to provide guidelines for absorber design. Two different micro-scale hatched tubes and a plain tube are tested to quantify the effect of the surface roughness on the absorption performance. The roughness of the micro-scale hatched tubes ranges 0.39-6.97 µm. The working fluid was H2O/LiBr solution with inlet concentration of 55, 58 and 61 wt.% of LiBr. Normal Octanol with a concentration of 400 ppm was used as the heat transfer additive. The absorber heat exchanger consists of 24 horizontal tubes in a column, liquid distributor at the liquid inlet and a liquid reservoir at the bottom of the absorber. The effect of the heat transfer additive on the heat transfer rate is found to be more significant in the plain tube than that in the micro-scale hatched tubes. It was found that the absorption performance for the micro-hatched tube with the heat transfer additive becomes up to 4.5 times higher than that for the plain tube without a heat transfer additive. It was concluded that the heat transfer enhancement by the heat transfer additive was more significant than that obtained using micro-scale surface treatment.

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Pages: 264-270

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Details

  • Original title: The effect of heat transfer additive and surface roughness of micro-scale hatched tubes on absorption performance.
  • Record ID : 2004-1070
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 3
  • Publication date: 2004/05

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