EXPERIMENTAL INVESTIGATIONS ON CONDENSATION CHARACTERISTICS OF PURE AND MIXTURE REFRIGERANTS OF HFCs IN HORIZONTAL MICRO-FIN TUBES

被引：0

作者：

Kukreja, R. ^{[1
]}

Jain, S. ^{[2
]}

Agarwal, R. S. ^{[2
]}

机构：

[1] Natl Inst Technol, Dept Mech Engn, Jalandhar 144008, India

[2] Indian Inst Technol, Dept Mech Engn, Delhi 110016, India

来源：

23RD IIR INTERNATIONAL CONGRESS OF REFRIGERATION | 2011年 / 23卷

关键词：

local condensation heat transfer coefficient; frictional pressure drop; flow condensation; micro-fin tubes; helix angle; and mixture refrigerant;

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The local condensation heat transfer coefficient and local frictional Pressure gradients were evaluated at saturation temperature of 35 degrees C & 40 degrees C respectively, in mass flux range of 200-400kg/m(2)-s & vapour quality range of 0.1-0.9 for R134a & R404A respectively, and in mass flux range of 200-300kg/m(2)-s & vapour quality range of 0.2-0.8 for R410A using two horizontal tubes with having helix angles, 15 degrees and 18 degrees. The overall uncertainty in the measurement of local heat transfer coefficient and average vapour quality were in the range of +/- 6-40% and +/- 3-15% respectively. The local heat transfer coefficients for R134a & R404A ranged from 1095-8797W/m(2)-K & 1422-7905W/m(2)-K while that of R410A were in the range of 1390-7255W/m(2)-K.Enhancement factors (EFs) for R134a, R404A and R410A were in ranges of 1.2-2.54, 1.15-2.4 & 1.2-2.1 respectively. The frictional pressure gradients obtained for refrigerants R134a & R404A were in the range of 1.3-11.5kPa/m and 0.9-5.8kPa/m respectively and that of R410A was in the range of 1.3-4.1kPa/m.

引用

页码：2864 / +

页数：3

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