开缝翅片管换热器换热和压降特性及其评价方法  

Measurement Method and Experimental Study on Heat Transfer and Pressure Drop Characteristics of Slit Fin-Tube Heat Exchangers

作　　者：孟辉[1] 晋欣桥[1] 杜志敏[1] 郭轶波[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《上海交通大学学报》2009年第5期766-771,共6页Journal of Shanghai Jiaotong University

摘　　要：通过干/湿交替循环试验得到换热器性能的评价方法,并使用该方法对不同翅片间距的开缝翅片管换热器进行试验,分别研究了翅片间距和空气侧流体的雷诺数(Re)对换热器的换热及其压降特性的影响.结果表明,需先经过若干次干/湿交替循环试验,待其测试数据稳定后,才可进行换热器的换热性能测试.风速对换热器性能的影响可转化为对Re的影响.在500<Re<1 000内,当Re相同时,翅片间距较小时,努塞尔数(Nu)和换热器空气侧压降的阻力系数(f)均较大;随着Re增加,Nu的降幅减小,而f的增幅增大.在湿工况下,Nu和f均随着水侧中心温度的增加而降低;翅片间距对Nu的影响与迎面风速有关;同时,f随着翅片间距的减小而增加,迎面风速越小,则FP对f的影响越显著.Appropriate measurement method was obtained through some dry-wet experiments. An experimental study was conducted to investigate the airside heat transfer （Nu） and pressure drop characteristics （f） of slit fin-tube heat exchangers at various fin pitches （1.2, 1.5 and 1.75 mm） through the method. The results show that the performances of heat exchanger become stable after several dry-wet cycles, in the range of low Re （Re〈1000）, both Nu and f decrease with the increase of fin pitch. With the decrease of Re, Nu seems relative independent of the decrease of fin pitch while f is sensitive to it.

关 键 词：翅片管换热器 换热 翅片间距 空气侧压降 

分 类 号：TK172[动力工程及工程热物理—热能工程]