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

M. C. Chyu, J. Zheng, Z. Ayub

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Shell-side heat transfer coefficients of individual tubes for ammonia/lubricant mixture boiling on a 3 × 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.

Original languageEnglish
Pages (from-to)1876-1885
Number of pages10
JournalInternational Journal of Refrigeration
Volume32
Issue number8
DOIs
StatePublished - Dec 2009

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