کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7045512 1457092 2018 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigation on a R134a ejector refrigeration system under overall modes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Experimental investigation on a R134a ejector refrigeration system under overall modes
چکیده انگلیسی
The performance of an ejector refrigeration system (ERS) with R134a ejectors was investigated experimentally. More stable operating states under overall modes were achieved by adopting shell-and-tube heat exchangers and setting the branch of pipe to the expansion valve between the condenser and the liquid receiver. It is found that the change of the ejector operational mode caused by varying the operating and geometric parameters of ejector has significant impact on ejector performance. With a rising generating temperature, the entrainment ratio can first increase and then decrease because the operational mode changes from subcritical mode to critical mode. A rise of the ejector area ratio can cause an increase in the critical entrainment ratio at the expense of a decrease in the critical condensing temperature. Moreover, the COP and the cooling capacity of the ERS behave similarly to the entrainment ratio. Empirical correlations obtained from the experimental data can accurately predict the critical entrainment ratio, the critical condensing temperature and the breakdown condensing temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 137, 5 June 2018, Pages 784-791
نویسندگان
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