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HEAT TRANSFER EVALUATION OF HFC-236EA WITH HIGH PERFORMANCE ENHANCED TUBES IN CONDENSATION AND EVAPORATION
Tzuoo, S. M. AND M. B. Pate. HEAT TRANSFER EVALUATION OF HFC-236EA WITH HIGH PERFORMANCE ENHANCED TUBES IN CONDENSATION AND EVAPORATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-98/033 (NTIS PB98-137177), 1998.
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 (3/4-in.), and they were evaluated at a saturation temperature of 2 C (35.6 F) in evaporation and 40 C (104 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.