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Enhancement of R123 pool boiling by the addition of hydrocarbons.

Author(s) : KEDZIERSKI M. A.

Type of article: Article, IJR article

Summary

This paper presents pool boiling heat transfer data for 10 different R123/hydrocarbon mixtures. The data consisted of pool boiling performance of a GEWA-T surface for pure R123 and for 10 dilute solutions of five different hydrocarbons: 1) pentane; 2) isopentane; 3) hexane; 4) cyclohexane and 5) heptane with R123. The heat flux and the wall superheat were measured for each fluid at 277.6 K. A maximum (19 more or less 3.5)% increase over the pure R123 heat flux was achieved with the addition of 0.5% mass isopentane to R123. Other mixtures of isopentane, pentane, hexane, and cyclohexane with R123 exhibited smaller maximums than that at the R123/isopentane (99.5/0.5) mixture. Presumably, a layer enriched in hydrocarbon at the heat transfer surface caused by the heat transfer enhancement. Conversely, an R123/heptane (99.5/0.5) mixture and an R123/cyclohexane (99.5/0.5) mixture exhibited only degradations with respect to the pure component performance for all test conditions. Several characteristics of the hydrocarbons were examined to determine their influence on the boiling heat transfer performance: molecular weight, molecular structure, composition, surface tension, and vapor pressure.

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Pages: 89-100

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Details

  • Original title: Enhancement of R123 pool boiling by the addition of hydrocarbons.
  • Record ID : 2000-2459
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 23 - n. 2
  • Publication date: 2000/03

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