کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
789803 1466460 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vapour condensation of R22 retrofit substitutes R417A, R422A and R422D on CuNi turbo C tubes
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Vapour condensation of R22 retrofit substitutes R417A, R422A and R422D on CuNi turbo C tubes
چکیده انگلیسی

Heat transfer coefficients (HTCs) for outer condensation of R22 and vapours of its retrofit substitutes R417A, R422A and R422D on 90/10 CuNi Turbo C tubes were experimentally measured. The tubes have 19.05 mm nominal outside diameter, 40 fins per inch (1575 fpm) on the outer surface and a smooth inner surface. The effective condensing length per tube was 1895 mm. Experimental data are reported at vapour saturation temperature of 40 °C and wall subcoolings from around 1.5 to 8 °C. A rapid increase of the HTCs for low wall subcoolings attributable to the presence of the hydrocarbon in the mixtures was found. For wall subcoolings greater than around 3 °C, the condensation HTCs slightly increase with raising the wall subcooling and they are for vapours of R417A, R422A and R422D lower by 65–76%, 24–31% and 60–67% than the HTCs for R22, respectively. Comparisons of the condensation performance amongst the different refrigerants and experimental enhancement factors for the condensation of R22 on 90/10 CuNi Turbo C tubes are reported in the paper.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refrigeration - Volume 33, Issue 1, January 2010, Pages 148–157
نویسندگان
, , , ,