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Enhancement of R123 Pool Boiling by the Addition of Hydrocarbons

Published

Author(s)

Mark A. Kedzierski

Abstract

This paper present pool boiling heat transfer data for ten different R123/hydrocarbon mixtures. The data consisted of pool boiling performance of a GEWA-TTM surface for pure R123 and for ten 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 {+ or 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 of the R123/isopentante (99.5/0.3) mixture. Presumably, a layer enriched in hydrocarbon at the heat transfer surface caused the heat transfer enhancement. Conversely, an R123/heptan (99.5/0.5) mixture and an R123/cylcohexane (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.
Citation
NIST Interagency/Internal Report (NISTIR) - 6244
Report Number
6244
Volume
No. 23

Keywords

additive, binary mixtures, enhanced heat transfer, fluid heating, GEWA-T<sup>TM</sup>, hydrocarbons, pool boiling, R123, refrigerants

Citation

Kedzierski, M. (1998), Enhancement of R123 Pool Boiling by the Addition of Hydrocarbons, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=860772 (Accessed June 17, 2024)

Issues

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Created October 1, 1998, Updated February 19, 2017