Heat Transfer Evaluation of HFC-236ea With High Performance Enhanced Tubes in Condensation and Evaporation
Final rept. Oct 92-Mar 95
IOWA STATE UNIV AMES DEPT OF MECHANICAL ENGINEERING
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The report gives results of an evaluation of the heat transfer performance of pure hydrofluorocarbon HFC-236ea for high performance enhanced tubes which had not been previously used in Navy shipboard chillers. Shell-side heat transfer coefficient data are presented for condensation on a Turbo-CII tube, pool boiling on Turbo-B and -BII tubes, and spray evaporation on Turbo-B and -CII tubes and a 1575-fpm fin-per-meter tube. These tubes have nominal outside diameters of 19.1 mm 34-in., and they were evaluated at a saturation temperature of 2 deg C 35.6 deg F in evaporation and 40 deg C 104 deg F in condensation. The condensation and pool boiling results for the high performance enhanced tubes were compared with those for a plain tube and two integral finned 1024- and 1575-fpm tubes, which were evaluated earlier. The comparison shows that the high performance enhanced tubes are able to promote heat transfer processes better than the plain tube, and especially better than the integral finned tubes that are currently being used with chlorofluorocarbon CFC-114 in the Navy shipboard chillers. The Turbo-CII, -BII, and -B tubes performed best in condensation, pool boiling, and spray evaporation, respectively. The comparative heat transfer performance of spray evaporation with pool boiling was made by using Turbo-B and 1575-fpm tubes.
- Organic Chemistry
- Air Pollution and Control