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Bundle effect of ammonia/lubricant mixture boiling on a horizontal bundle with enhanced tubing and inlet quality.

Author(s) : CHYU M. C., ZHENG J., AYUB Z.

Type of article: Article, IJR article

Summary

Shell-side heat transfer coefficients of individual tubes for ammonia/lubricant mixture boiling on a 3 x 5 enhanced tube bundle were measured, enabling a detailed study of tube bundle effect under the influences of inlet quality, concentration of miscible lubricant (co-polymer of polyalkylene glycol, PAG), saturation temperature, and heat flux. Tests were conducted in the range of heat flux from 3.2 to 32.0 kW/m2, simulated inlet quality from 0.0 to 0.4, saturation temperature from -13.2 to 7.2°C, and lubricant concentration from 0 to 10%. The data show that bundle effect is more significant at a higher saturation temperature. Most of the data in the bottom row are lower than the single-tube heat transfer coefficient data at a low saturation temperature. Lubricant renders the heat transfer coefficient lower in lower rows and higher in higher rows, therefore a larger range of data variation.

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Pages: pp. 1876-1885

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Details

  • Original title: Bundle effect of ammonia/lubricant mixture boiling on a horizontal bundle with enhanced tubing and inlet quality.
  • Record ID : 2009-2277
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 32 - n. 8
  • Publication date: 2009/12

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