非共沸工质在分液板式冷凝器中的热力性能  

Thermodynamic performance of zeotropic mixtures in liquid-vapor separation plate condenser

作　　者：蔡楷楠 陈健勇[1] 陈颖 罗向龙[1] 梁颖宗 何嘉诚 CAI Kainan;CHEN Jianyong;CHEN Ying;LUO Xianglong;LIANG Yingzong;HE Jiacheng(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006

出　　处：《化工进展》2025年第1期48-56,共9页Chemical Industry and Engineering Progress

基　　金：广东省基础与应用基础研究基金自然科学基金(2022A1515012035)。

摘　　要：将“分液冷凝”应用于板式冷凝器中,并采用非共沸工质R134a/R245fa作为制冷剂,分别研究了工质流量、泡点温度以及工质组分(质量比)对分液板式冷凝器换热性能的影响,并与普通板式冷凝器进行对比,揭示非共沸工质在分液板式冷凝器中的热力性能。研究结果表明:低沸点工质在非共沸工质中的占比越高,气液分离的效果越好,分液效率最高可达到99.74%;“气液分离”可有效调节非共沸工质的组分,经过“气液分离”后低沸点工质在非共沸工质中的占比会提高;与普通板式冷凝器相比,分液板式冷凝器传热系数提高了5.6%~46.9%,并且与工质流量成反比,与泡点温度成正比;压降降低了12.6%~44.3%,且受工质流量、泡点温度的影响较小,低沸点工质在非共沸工质中的占比越高,压降越小。“Liquid-vapor separation”was applied in plate condenser with zeotropic mixtures R134a/R245fa.The impact of refrigerant mass flows,bubble point temperatures and the compositions of mixtures(mass fractions)on the heat transfer performance of the liquid-vapor separation plate condenser were examined.A comparison with experimental data from a conventional plate condenser was conducted to highlight the thermodynamic performance of zeotropic mixtures.The results showed that a high proportion of low-boiling-point refrigerant improved liquid-vapor separation,achieving a maximum liquid separation efficiency of 99.74%.“Liquid-vapor separation”effectively adjusted the compositions of the zeotropic mixtures,increasing the proportion of low-boiling-point refrigerant after separation.Compared with conventional plate condenser,the liquid-vapor separation plate condenser exhibited a 5.6%—46.9%increase in heat transfer coefficient.It was inversely proportional to refrigerant mass flows and directly proportional to bubble point temperatures.The pressure drop decreased by 12.6%—44.3%,less affected by refrigerant mass flows and bubble point temperatures,a higher proportion of low-boiling-point refrigerant in the zeotropic mixtures resulted in a smaller pressure drop.

关 键 词：非共沸工质 分液冷凝 两相流 传热 压降 

分 类 号：TQ051.61[化学工程]