采用窗片的5 mm管换热器在湿工况下换热性能的实验研究  

Experimental Investigation of Heat Transfer Characteristics of Louver Fin-and-tube Heat Exchanger with 5 mm Diameter Tubes under Wet Conditions

作　　者：高晶丹[1] 丁国良[1] 吴伟[1] 胡海涛[1] 高屹峰[2] 宋吉[2] 

机构地区：[1]上海交通大学制冷与低温研究所,上海200240 [2]国际铜业协会,上海200020

出　　处：《制冷技术》2012年第3期6-9,26,共5页Chinese Journal of Refrigeration Technology

摘　　要：在湿工况下,对11个采用百叶窗翅片的5 mm管换热器进行了实验研究,并分析了翅片间距、进口空气相对湿度等因素对空气侧换热性能的影响。研究结果表明:换热量随翅片间距的增加而减小,且比7 mm管或更大管径换热器更明显;换热量受进口空气相对湿度的影响小;在翅片底部出现水桥,而在7 mm管或者更大管径换热器中不曾出现。根据实验数据开发了预测5 mm翅片管换热器换热性能的j因子关联式,误差在士20%以内。The heat transfer characteristics of fm-and-tube heat exchangers with 5 mm diameter tubes under wet conditions were investigated by experiments on 11 louver fm-and-tube heat exchangers.The effects of fin pitch and inlet relative humidity on air-side performance were analyzed.The results indicated that the effect of inlet relative humidity on the heat transfer rate is small,and heat transfer rate decreases with the increase of fin pitch, which is more obvious than that of fm-and-tube heat exchanger with 7 mm or larger diameter tubes.The water bridge was observed at the bottom of fin in experiments;however,it did not occur on the fin with 7 mm or large diameter tubes.A correlation for j factor was developed to predict the heat transfer performance of fm-and-tube heat exchanger with 5 mm diameter tubes.The deviations of the proposed j correlation are within±20%.

关 键 词：湿工况 管翅式换热器 换热性能 5 MM j因子 

分 类 号：TK172[动力工程及工程热物理—热能工程]