竖插翅片微通道换热器空气侧流动换热分析及参数优化  

Air-side Thermal-hydraulic Analysis and Parameter Optimization for Vertical-fin Microchannel Heat Exchanger

作　　者：赵日晶 位兴华 黄东[1] 李丰 赵永峰 Zhao Rijing;Wei Xinghua;Huang Dong;Li Feng;Zhao Yongfeng(Department of Refrigeration&Cryogenic Engineering,Xi′an Jiaotong University,Xi′an,710049,China;Media HVAC&Building Technologies Division Research and Development Center,Foshan,528311,China;Jiangsu Clean&Cool Seiko Technology Co.,Ltd.,Changzhou,213200,China)

机构地区：[1]西安交通大学制冷与低温工程系,西安710049 [2]美的暖通与楼宇事业部研发中心,佛山528311 [3]江苏科菱库精工科技有限公司,常州213200

出　　处：《制冷学报》2023年第3期87-94,共8页Journal of Refrigeration

基　　金：国家自然科学基金(51876154)资助项目。

摘　　要：竖插翅片微通道换热器(VMX)具有良好的流动及换热性能和优异的排水性能,应用于空气源热泵可以适应较宽工况。本文使用CFD模型计算VMX在干工况下的空气侧流动换热,通过实验验证了模型误差小于20%;对比复合翅片的波纹和开窗的前后顺序及搭接方式,分析翅片间距、翅片长度、扁管间距和翅片厚度对换热器性能的影响,采用Taguchi方法寻找最优的参数组合。结果表明:相同泵功下前开窗后波纹逆接翅片的强化换热效果最好;以综合指标P_(ec)作为VMX的性能评价参数时,扁管间距和翅片长度是主要影响因素;在实际可选的参数范围内,翅片间距1.8 mm、翅片长度25.6 mm、扁管间距12.0 mm、翅片厚度0.12 mm的参数组合可使换热器性能最佳。Vertical-fin microchannel heat exchangers(VMXs)have efficient thermal-hydraulic performance and favorable drainage performance,such that they are capable of being utilized in air-source heat pumps under wide operating conditions.In this study,a CFD(computational fluid dynamics)model was used to analyze the air-side thermal-hydraulic performance of VMXs under dry conditions.The model was verified using experimental results with an error of less than 20%.Subsequently,the sequence and connection of waves and louvers on composite fins were compared,and the effects of fin pitch,fin length,tube pitch,and fin thickness were investigated.Finally,parametric optimization was conducted using the Taguchi method.The results show that under constant pumping power,the heat transfer enhancement of the composite fin with the front louver fin and the reversely connected rear wavy fin is the best.When the comprehensive index performance evaluation criterion(P_(ec))was used to evaluate the performance of the VMXs,the tube pitch and fin length were determined as the main influencing factors.Within the range of parameters practically available,the best performance is obtained by a combination of 1.8 mm fin pitch,25.6 mm fin length,12.0 mm flat tube pitch,and 0.12 mm fin thickness.

关 键 词：空气源热泵 冷凝器 微通道换热器 传热系数 

分 类 号：TB657.5[一般工业技术—制冷工程] TK124[动力工程及工程热物理—工程热物理]