基于分排参数法的翅片管式换热器空气侧性能试验研究  

Experimental investigation on air-side performance of finned tube heat exchangers based on row-division discrete method

作　　者：陈云浩 许婧煊 谷波[1] 吴鹏展 Chen Yunhao;Xu Jingxuan;Gu Bo;Wu Pengzhan(School of Mechanical Engineering,Shanghai Jiao Tong University;School of Energy and Power Engineering,University of Shanghai Science and Technology)

机构地区：[1]上海交通大学机械与动力工程学院 [2]上海理工大学能源与动力工程学院

出　　处：《制冷与空调》2024年第10期71-78,共8页Refrigeration and Air-Conditioning

基　　金：国家自然科学基金(51976114)。

摘　　要：将分排参数法应用于翅片管式换热器性能试验数据处理,并对该方法计算得到的各管排j因子和f因子与分布参数法计算结果进行对比,误差均处于±10%以内。基于分排参数法对换热器分排空气侧换热和阻力性能以及变工况性能进行试验研究,结果表明:换热器前排换热量占比较高,换热器管排数越多换热量分布均匀性越差;随着翅片间距的增大,换热量分布均匀性变好,翅片间距从2.5 mm增加到3.5 mm,第一排与最后一排换热量占比之差由17%减小到13%;换热量分布均匀性随管径的增大而变差,管径从10.23mm增大到16.73mm,第一排与最后一排换热量占比之差由14%增大到17%。随着管排位置后移,各排j因子和f因子均增大;翅片间距由2.5mm增加到3.5mm,各排j因子和f因子分别减小2.50%和7.68%;管径由10.23mm增大到16.73mm,各排j因子减小33.79%,f因子增大3.49%。随着风量和水流量的增大,换热量增大但增速降低;风量的增大能够增大出风相对湿度,而水流量的增大会使得出风相对湿度降低。The row-division discrete method is applied to the performance experiment data processing of finned tube heat exchangers.Comparing the j-factor and f-factor of each row tube calculated by this model with those calculated by the tube-by-tube method,the errors are all within±10%.Then the air-side heat transfer and resistance performance,and the performance of the variable working condition are investigated by test based on the row-division discrete method.The results show that the heat transfer capacity ratio of the front row of the heat exchanger is higher,and the more the number of the heat exchanger rows is,the worse the distribution of heat transfer capacity gets.With the increase of fin spacing,the heat transfer capacity uniformity becomes better;when the fin spacing increases from 2.5 mm to 3.5 mm,the difference of heat transfer capacity ratio between the first row and the last row decreases from 17%to 13%.The uniformity of the heat transfer capacity distribution decreases with the increase of pipe diameter;when the pipe diameter increases from 10.23 mm to 16.73 mm,the difference of the heat transfer capacity ratio between the first row and the last row increases from 14%to 17%.The j-factor and f-factor of each row increases as the position of the row moves back.When the fin spacing increases from 2.5 mm to 3.5 mm,the j-factor and f-factor decrease by 2.50%and 7.68%,respectively.When the pipe diameter increases from 10.23 mm to 16.73 mm,the j-factor of each row decreases by 33.79%,and the f-factor of each row increases by 3.49%.With the increase of air volume and water flow,the heat transfer capacity increases,but the increasing rate decreases.The increase of air volume can increase the relative humidity of outlet air,while the increase of water flow will reduce the relative humidity of outlet air.

关 键 词：翅片管式换热器 百叶窗 空气侧特性 分排参数法 分布参数法 

分 类 号：TB6[一般工业技术—制冷工程]