热气直通化霜技术及电子膨胀阀设计研究  

Hot Gas Direct Defrosting Technology and Design Research of Electronic Expansion Valve

作　　者：王现林 李亚飞 连彩云 杨旭东[1] Wang Xianlin;Li Yafei;Lian Caiyun;Yang Xudong(Tsinghua University,Beijing,100084;Gree Electric Appliances,Inc.of Zhuhai,Zhuhai,519070)

机构地区：[1]清华大学,北京100084 [2]珠海格力电器股份有限公司,珠海519070

出　　处：《制冷与空调（四川）》2023年第2期187-193,230,共8页Refrigeration and Air Conditioning

摘　　要：在该研究中,首先提出了空气源热泵热气直通化霜的概念,该技术不需增设热气旁通支路,化霜期间的冷媒流向同制热循环。然后对热气直通化霜期间的流量需求进行了分析,改进了电子膨胀阀的流量曲线,设计了双锥面电子膨胀阀结构以满足正常制热和热气直通化霜期间的流量需求。最后利用CFD技术模拟了热气直通化霜过程中不同膨胀阀脉冲时R32制冷剂在膨胀阀内部的热量损失,结果表明存在最优膨胀阀开度使得膨胀阀出口的化霜热量最大。In this work,the concept of hot gas direct defrosting(HGDD)of air-source heat pump is proposed at first,which does not need to add a hot gas bypass branch and the refrigerant flow direction during defrosting is the same as that of heating cycle.In the next,the flow rate demand of HGDD was analyzed,the flow rate curve of the electronic expansion valve was improved,and a biconical electronic expansion valve was designed to meet the flow rate demand during heating and hot gas direct defrosting.Finally,the heat loss of R32 refrigerant in the expansion valve under different expansion valve pulses during the hot gas direct defrosting process was simulated using CFD technology,and the results showed that there existed an optimal expansion valve opening to produce the largest defrosting heat at expansion valve outlet.

关 键 词：热气直通化霜 双锥面电子膨胀阀 流量曲线 能量损失 

分 类 号：TB615[一般工业技术—制冷工程]