上海交通大学学报

上海交通大学学报（自然版）

• 能源与动力工程 •    下一篇

小管径强化管内R410A-油混合物流动沸腾阻力特性

胡海涛1，黄翔超1，丁国良1，邓斌2，高屹峰3
  

  1. (1.上海交通大学 制冷与低温工程研究所， 上海 200240； 2.金龙精密铜管集团股份有限公司中国科学院精密铜管工程研究中心， 上海 200135； 3.国际铜业协会(中国)上海代表处， 上海 200020)
  • 收稿日期:2009-12-11 修回日期:1900-01-01 出版日期:2010-10-31 发布日期:2010-10-31

Flow Resistance Characteristics of R410A-oil Mixture during Evaporation in a Small Diameter Enhanced Tube

HU Haitao1，HUANG Xiangchao1，DING Guoliang1，DENG Bin2，GAO Yifeng3
   

  1. (1.Institute of Refrigeration and Cryogenics Engineering, Shanghai Jiaotong University, Shanghai
    200240, China; 2.Institute of Heat Transfer Technology, Golden Dragon Precise Copper Tube Inc.,
    Shanghai 200135, China;3.International Copper Association Ltd., Shanghai 200020, China)
  • Received:2009-12-11 Revised:1900-01-01 Online:2010-10-31 Published:2010-10-31

摘要： 实验研究了环保制冷工质R410A润滑油混合物在5 mm小管径内螺纹强化管内流动沸腾的摩擦压降特性.实验结果表明，对于纯制冷剂R410A，摩擦压降随着干度的增大先增大后减小，峰值出现在干度为0.7~0.8左右；R410A油混合物的摩擦压降随油平均质量分数、干度和质流密度的增大而增大，当油平均质量分数从0增长到5%时，在干度为0.9的高干度工况下，摩擦压降最大可增加120%.R410A油混合物在5 mm强化管内流动沸腾的摩擦压降与7 mm强化管的相比约增大10%~30%；用已有的7 mm强化管的压降关联式预测5 mm强化管的压降时，误差为±40%.以R410A油混合物在7和5 mm强化管内摩擦压降的实验值为基础，建立了基于混合物物性的R410A油混合物在不同管径强化管内的摩擦压降关联式.该关联式的预测值与95%的实验值误差在±20%以内.

关键词: R410A, 油, 强化管, 小管径, 压降, 关联式

Abstract:
An experimental study of flow resistance characteristics of R410Aoil mixture during evaporation inside a 5 mm internally spiral grooved enhanced tube was performed. The test results show that the frictional pressured drop of R410A initially increases with vapor quality and then decreases, presenting a local maximum in the vapor quality range between 0.7 and 0.8; the frictional pressure drop of R410Aoil mixture increases with increasing nominal oil concentration, vapor quality and mass flux; the presence of oil enhances frictional pressure drop maximum by 120% as the oil concentration increases from 0 to 5% at a vapor quality of 0.9. The frictional pressure drop of R410Aoil mixture in 5 mm enhanced tube is about 10% to 30% higher than that in 7 mm enhanced tube. The deviations of the prediction of existing correlation for 7 mm enhanced tube to the pressure drop characteristics of R410Aoil mixture in 5 mm enhanced tube are within ±40%. Based on the experimental data of R410Aoil mixture in 7 mm and 5 mm enhanced tubes, a new correlation of frictional pressure drop was developed by considering the mixture properties, which agreed with 95% of the experimental data within the deviation of ±20%.

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