干湿工况下波纹翅片管换热器空气侧特性的对比.pdfVIP

维普资讯 学兔兔 第44卷第9期 机 械 工 程 学 报 Vo1．44 NO．9 2008年 9月 CHINESE JOURNAL OF MECHANICAL ENGINEERING Sep． 2008 DoI：10．3901／JME．2008．09．209 干湿工况下波纹翅片管换热器空气侧特性的对比术 张圆明 丁国良 马小魁 (上海交通大学机械与动力工程学院 上海 200030) 摘要：对7个带亲水层和3个不带亲水层波纹翅片管换热器在析湿工况下空气侧的换热压降特性进行了试验研究，在不同的 入口风速和入口相对湿度下比较了干湿工况下的空气侧特性。结果表明，对带亲水层的波纹翅片，析湿工况下的压降显著地 高于干工况下的：当入口风速小于0．5 m／s时，湿工况下的换热性能低于干工况下的，当入口风速增加到2．0 m／s时，湿工况 下的换热性能则强于干工况下的。析湿工况下带亲水层波纹翅片的换热性能比不带亲水层波纹翅片的偏低一些，但是表面涂 上亲水层可以大大降低空气侧的压降。提出析湿工况下波纹翅片管换热器空气侧的换热和压降关联式，平均误差分别为8．70％ 和7．90％，可用于设计波纹翅片管换热器或者评价它的性能。 关键词：波纹翅片 析湿工况 换热 关联式 中图分类号：TK124 Comparison of Airside Characteristics of Wavy Fin—and—tube Heat Exchangers Under Dry and Wet Conditions ZHANG Yuanming DING Guoliang MA Xiaokui (School of Mechanical Engineering，Shanghai Jiaotong University，Shanghai 200030) Abstract：The airside heat transfer and pressure drop characteristics of 7 hydrophilic coated and 3 uncoated wavy fin··and--tube heat exchangers are studied under dehumidifying conditions experimentally．Airside performances under dry and wet conditions are compared at different inlet air velocities and different inlet relative humidity．The test results indicate that for the hydrophilic coated wavy fin，pressure drop under dehumidifying conditions is pronouncedly higher than that under dry conditions；when the inlet velocity is less than 0．5 m／s，heat trans~r performance under dehumidifying conditions is lower than that under dry conditions；when the inlet velocity increases to 2．0 m／s，heat transfer performance under dehumidifying conditions is be~er than that