微通道蒸发器高风速湿工况性能试验研究  

Experimental study on performance of microchannel heat exchanger under high air velocity and dehumidifying conditions

作　　者：魏文建 王炎峰 WEI Wenjian;WANG Yanfeng(Institute of Advanced Heat Transfer and Energy Application,Zhejiang University of Water Resources and Electric Power,Hangzhou 310018,China;Zhejiang Dunan Themal-Tech Co.,Ltd.,Zhuji 311835,China)

机构地区：[1]浙江水利水电学院先进换热与能源应用研究所,杭州310018 [2]浙江盾安热工科技有限公司,浙江诸暨311835

出　　处：《流体机械》2023年第8期13-19,共7页Fluid Machinery

基　　金：浙江省重大科技攻关“领雁”项目(2022C01159)。

摘　　要：为了研究微通道蒸发器在高风速湿工况下的热力性能和漂水特性,对不同翅片间距和表面特性的微通道换热器进行了试验研究。结果表明,亲水表面处理的微通道蒸发器不能改善湿工况热力性能和凝水排除效果,相反会恶化。亲水表面处理对换热因子j影响不显著,但使风侧阻力系数f增加。在测试工况条件下,亲水表面处理对换热因子j的影响小于1%,风阻系数增大4%~9%。j和f对翅片密度、空气湿度和风速的变化不敏感。亲水表面微通道换热器增大连续性水桥形成机会,增大漂水风险。常规工况下光箔和亲水箔均未发现漂水现象;高湿工况下光箔未发现漂水,亲水箔在风速4.5 m/s和较小翅片间距1.7 mm时,出现轻微漂水。Thermal-hydraulic characteristics of microchannel heat exchanger with different fin pitches and surface wettability were investigated under high air velocity and different air inlet humidity conditions.The results show that the microchannel evaporator with hydrophilic surface treatment cannot improve the thermal performance and condensate exclusion effect under wet conditions,but will deteriorate.It has no significant effect on heat transfer colbum j factor.However,the friction factor f on the wind side increases.Under the test conditions,influence of hydrophilic surface treatment on j factor is less than 1%,while the air friction factor increases by 4%~9%.Factors of j and f are insensitive to rariations of in fin density,air humidity,and air veloctiy.Hydrophilic surface could also increase the chance of continuous water-bridge formation,which increases the risk of water carryover.Under normal working conditions,no water carry-over phenomenon was found in bare foil and hydrophilic foil.Under the given high humidity condition,no water carry-over occurred for bare fins with different fin pitches and air velocity,while slight water carry-over was observed for hydrophilic surface with fin pitch of 1.7 mm and air velocity of 4.5 m/s.

关 键 词：排水 凝结 蒸发 高湿 微通道换热器 

分 类 号：TH137.8[机械工程—机械制造及自动化] TK124[动力工程及工程热物理—工程热物理]