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。
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 transfer 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 better than that under dry conditions. The heat transfer performance of wavy fin with hydrophilic coating is slightlyly lower than that of uncoated wavy fin under dehumidifying conditions, but the pressure drop of wavy fin with hydrophilic coating is pronouncedly lower than that of uncoated wavy fin. The airside heat transfer and pressure drop correlations of wavy fin-and-tube heat exchangers under dehumidifying conditions are proposed and the mean errors are 8.70% and 7.90%, respectively. These correlations can be used to design wavy fin-and-tube heat exchangers or to evaluate their performances.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2008年第9期209-214,共6页
Journal of Mechanical Engineering
基金
教育部新世纪优秀人才支持计划资助项目(NCET-05-0403)。
关键词
波纹翅片
析湿工况
换热
关联式
Wavy fin Dehumidifying conditions Heat transfer Correlation
作者简介
张圆明，男，1983年出生。主要从事波纹翅片管换热器空气侧特性的研究。E-mail：glding@sjtu．edu．cn
