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Study of the performance of a vapor compression refrigeration system using conically coiled tube-in-tube evaporator and condenser

被引：16
|
作者：
Salem, M. R. [1 ]
El-Gammal, H. A. [1 ]
Abd-Elaziz, A. A. [1 ]
Elshazly, K. M. [1 ]
机构：
[1] Benha Univ, Fac Engn Shoubra, Mech Engn Dept, 108 Shoubra St, Cairo 11629, Egypt
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2019年 / 99卷
关键词：
Conically coiled tube; Coefficient of performance; Vapor compression refrigeration system; Taper angle; Torsion; HEAT-TRANSFER; FLOW; AUGMENTATION; EXCHANGER; WORKING; R134A;
D O I：
10.1016/j.ijrefrig.2018.12.006
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
This study experimentally investigates the effect of the geometrical parameters of a vertical conically coiled tube-in-tube (CCTIT) evaporator/condenser and their operating conditions on their effectiveness and on the coefficient of performance (COP) of a vapor compression refrigeration system (VCRS). Twelve CCTIT evaporator/condenser of different taper angles (0-135 degrees) and torsions (0.0777-0.1311) are tested for different water Dean numbers in their annuli, while R134a flows in their internal tube in a counter flow configuration. The results show that increasing the evaporator/condenser taper angles and torsions in addition to decreasing their water Dean numbers augment the evaporator/condenser effectiveness and the COP of the VCRS. However, the coils taper angles have the more dominant effect than the other studied parameters. Finally, experimental correlations are developed to predict the COP of the VCRS in addition to the effectiveness of both the evaporator and condenser as functions of the investigated parameters. (C) 2018 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码：393 / 407
页数：15
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