Experiment on Boiling Heat Transfer of Refrigerant R134a in Mini-channels

被引：0

作者：

ZHAN Hongbo ^{[1
]}

SHEN Hao ^{[2
]}

WEN Tao ^{[1
]}

ZHANG Dalin ^{[1
]}

机构：

[1] College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics

[2] Shanghai Aircraft Airworthiness Certification Center of CAAC

来源：

Transactions of Nanjing University of Aeronautics and Astronautics | 2019年 / 36卷 / 01期

关键词：

flow boiling; heat transfer; two-phase flow; refrigerant R134a; channels with offset fins; multi-port channel;

D O I：

10.16356/j.1005-1120.2019.01.007

中图分类号：

TK124 [传热学]; V245.3 [环境控制设备];

学科分类号：

080701 ; 082504 ;

摘要：

The flow boiling heat transfer characteristics of refrigerant R134 a flowing inside two different kinds of minichannels are investigated. One channel is multi-port extruded with the hydraulic diameter of 0.63 mm,and the other one is rectangular with offset fins and a hydraulic diameter of 1.28 mm. The experiments are performed with a mass flow rate between 68 and 630 kg/(m2·s),a heat flux between 9 and 64 kW/m2,and a saturation pressure between 0.24 and 0.63 MPa,under the constant heat flux heating mode. It is found that the effect of mass flow rate on boiling heat transfer is related to heat flux,and that with the increase of heat flux,the effect can only be efficient in higher vapor quality region. The effects of heat flux and saturation pressure on boiling heat transfer are related to a threshold vapor quality,and the value will gradually decrease with the increase of heat flux or saturation pressure. Based on these analyses,a new correlation is proposed to predict the boiling heat transfer coefficient of refrigerant R134 a in the mini-channels under the experimental conditions.

引用

页码：80 / 87

页数：8

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