Ejector design and theoretical study of R134a ejector refrigeration cycle

被引：70
|
作者：
Khalil, A. [2 ]
Fatouh, M. [1 ]
Elgendy, E. [1 ]
机构：
[1] Helwan Univ, Fac Engn El Mattaria, Dept Power Mech Engn, Cairo 11718, Egypt
[2] Cairo Univ, Fac Engn, Dept Power Mech Engn, Giza 12316, Egypt
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION | 2011年 / 34卷 / 07期
关键词：
R134a; Ejector; System; Design; Air conditioning; Performance; Modelling; PERFORMANCE-CHARACTERISTICS; SYSTEM;
D O I：
10.1016/j.ijrefrig.2011.01.005
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In the present paper, a mathematical model is developed to design R134a ejector and to predict the performance characteristics of a vapor jet refrigeration system over a wide range of the investigated parameters. These parameters include boiling temperature (65-85 degrees C), condensing temperature (25-40 degrees C), evaporating temperature (0-10 degrees C), degrees of superheat (0-15 degrees C), nozzle efficiency (0.75-0.95) and diffuser efficiency (0.75-0.95). Simulated results showed that the present model data are in good agreement with experimental data in the literature with an average error of 6%. It is found that the ejector area ratio at boiling temperature of 85 degrees C is about double that at boiling temperature of 65 degrees C for various evaporating and condensing temperatures. The present results confirm that waste heat sources of temperature ranging from 65 to 85 degrees C are adequate to operate vapor jet refrigeration system for air-conditioning applications. (C) 2011 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码：1684 / 1698
页数：15
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