کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
663154 | 1458189 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaporating heat transfer and pressure drop of hydrocarbon refrigerants in 9.52 and 12.70Â mm smooth tube
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Experimental results of heat transfer characteristic and pressure gradients of hydrocarbon refrigerants R-290, R-600a, R-1270 and HCFC refrigerant R-22 during evaporating inside horizontal double pipe heat exchangers are presented. The test sections have one tube diameter of 12.70Â mm with 0.86Â mm wall thickness, another tube diameter of 9.52Â mm with 0.76Â mm wall thickness was used for this study. The local evaporating heat transfer coefficients of hydrocarbon refrigerants were higher than those of R-22. The average evaporating heat transfer coefficient increased as the mass flux increased. It is showed the higher values in hydrocarbon refrigerants than R-22. Comparing the heat transfer coefficient of experimental results with that of other correlations, the obtained results from the experiments had coincided with most of the Kandlikar's correlation. Hydrocarbon refrigerants have higher pressure drop than R-22 in 12.7Â mm and 9.52Â mm. This results form the study can be used in the case of designing heat transfer exchangers using hydrocarbons as the refrigerant for the air-conditioning systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 12, June 2005, Pages 2351-2359
Journal: International Journal of Heat and Mass Transfer - Volume 48, Issue 12, June 2005, Pages 2351-2359
نویسندگان
H.S. Lee, J.I. Yoon, J.D. Kim, Pradeep Bansal,