Oil entrainment in vertical refrigerant piping

被引：23
|
作者：
Kesim, SC [1 ]
Albayrak, K [1 ]
Ileri, A [1 ]
机构：
[1] Middle E Tech Univ, Dept Mech Engn, TR-06531 Ankara, Turkey
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION | 2000年 / 23卷 / 08期
关键词：
refrigerating circuit; piping; vertical tube; oil return; refrigerant; vapour; speed; calculation;
D O I：
10.1016/S0140-7007(99)00085-7
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The aim of this study is to investigate the required refrigerant speed, hence minimum refrigeration load, for carrying the lubricating oil up in vertical sections of refrigerant lines. It is assumed that the downward flow of the thin oil layer over the inner surface of the riser due to gravity is to be balanced with the upward flow of the oil film due to the shear force created by the upward flow of the refrigerant vapor. Velocities are converted to refrigeration capacities by considering a saturated cycle between specified condenser and evaporator pressures. General relationships thus developed are enumerated for R134a by preparing minimum capacity tables for copper suction and discharge risers. (C) 2000 Elsevier Science Ltd and IIR. All rights reserved.
引用
收藏
页码：626 / 631
页数：6
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