新型插片式微通道换热器性能特性试验研究  

Experimental study on performance of novel inserted microchannel heat exchanger

作　　者：位兴华 赵日晶 黄东[1] Wei Xinghua;Zhao Rijing;Huang Dong(Department of Refrigeration&Cryogenic Engineering,School of Energy and Power Engineering,Xi’an Jiaotong University)

机构地区：[1]西安交通大学能源与动力工程学院

出　　处：《制冷与空调》2022年第5期73-78,97,共7页Refrigeration and Air-Conditioning

基　　金：山东省重大科技创新工程项目(2019JZZY020813)。

摘　　要：传统微通道换热器的翅片折叠成V字型,焊接在扁管之间,所以翅片中存在很多夹角,融霜水会滞留在这些夹角内,对后续的制热产生很大影响。新型插片式微通道换热器的翅片竖直布置,上下连接为一体,不存在翅片夹角,同时翅片可以进行开窗及加波纹的处理,起到强化换热的作用。本文针对新型插片式微通道换热器,通过试验的方法研究了其作为空调系统室外换热器的制冷、制热能力,以及结霜除霜特性。结果表明,制冷剂充注量在制冷工况下减小了50g,制热工况下减小100g。由于3个支路的制冷剂分配不均匀,微通道换热器的性能没有发挥到最佳。将三支路三流程微通道替换为两支路两流程微通道之后,制冷量提升2.92%,制热能效提升2.5%。表明通过优化可以使微通道室外机的性能进一步提升。新型插片式微通道室外机的制冷/制冷能力及能效略微降低。但是,新型插片式微通道换热器的制冷剂充注量减少,同时换热器的体积及重量大幅降低,最终使得整体成本降低。结霜工况下新型插片式微通道室外机仍然可以使用,解决了一代微通道换热器不能作为室外蒸发器的问题。但是其制热性能仍然低于现有的铜管翅片换热器,表明要实现微通道替代铜管翅片换热器需要进一步地优化研究。The fins of the traditional micro-channel heat exchanger are folded into“V”shape and welded between the flat tubes,so there are many angles in the fins,and the defrosting water will stay in these angles,which will have a great impact on the subsequent heatingprocess.The fins of the novel micro-channel heat exchanger are arranged vertically and connected as a whole,and there is no fin Angle.At the same time,the fins can be windowed and corrugated to enhance the heat transfer.In this paper,the refrigeration and heating capacity,as well as the defrosting and defrosting characteristics of a novel insertedmicrochannel heat exchanger used as an outdoor heat exchanger of air conditioning system are studied by experimental method.The results show that the refrigerant charge is reduced by 50 g in the refrigeration condition and 100 g in the heating condition.Due to the uneven distribution of refrigerant in the three branches,the performance of microchannel heat exchanger is not the best.After replacing the three branchandthree flow path microchannelheat exchanger with two branch and two flow pathmicrochannel heat exchanger,the cooling capacity and heating efficiency are increased by 2.92%and 2.5%,respectively.The results show that the performance of the microchanneloutdoor unitcan be further improved by optimization.The refrigeration/refrigeration capacity and energy efficiency of the new microchanneloutdoor unit are slightly reduced.However,the refrigerant charge of the new microchannel heat exchanger is reduced,and the volume and weight of the heat exchanger are greatly reduced,which ultimately reduces the overall cost.The new microchannel heat exchanger can still be used under frosting condition,which solves the problem that the first generation microchannel heat exchanger can not be used as outdoor evaporator.However,its heating performance is still lower than that of the existing copper tube fin heat exchanger,which indicates that further optimization research is needed to replace the copper tube fin heat exchang

关 键 词：插片式微通道换热器 制冷制热能力 结霜及除霜 

分 类 号：TB6[一般工业技术—制冷工程]