摘要
为揭示间壁式筛网网格换热器中网片与隔热片厚度比对换热器效率的影响规律,在数值计算中引入了间壁热阻和隔热片导热系数,改进了传统间壁式网格换热器的数值计算方法.通过与传统计算方法对比,发现改进方法使间壁式网格换热器计算更加精确并更体现其结构特点.利用改进的方法对换热器进行性能分析,得到了换热器效率及其内部温度分布特性.结果显示,隔热片与网片厚度的选取对换热器性能具有明显的影响,当隔热片厚度为0.2mm及网片与隔热片的厚度比为4∶1时,相同长度下的换热器性能达到最优.
In order to examine the influence of the thickness ratio of wire-screen over spacer on the effectiveness of a wall-type matrix heat exchanger,the wall and spacer heat resistances were adopted to improve the numerical computing method for the structure and thermal performance analysis of the wall-type matrix heat exchanger.The comparison with the conventional numerical computing method shows that the improved method can enhance the computation accuracy of the matrix heat exchanger and exhibit its structural features better.The performance analysis on the exchanger by the improved method indicates that the wire-screen thickness and the spacer thickness will influence the exchanger effectiveness significantly.In the case of the identical size,the matrix heat exchanger could obtain the optimum effectiveness when spacer thickness is 0.2 mm and the thickness ratio of wire-screen over spacer is 4∶1.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2012年第1期24-29,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50976082)
高等学校博士学科点专项基金资助项目(20100201120016)
中国科学院低温工程学重点实验室开放课题(CRY0201125)
高校基本科研业务费资助项目
关键词
网格换热器
金属筛网
低温制冷机
数值模拟
matrix heat exchanger
woven wire screen
cryocooler
numerical simulation
