强非共沸工质R134a/R23/R14汽液相平衡和压焓图的构建及应用  

Construction and application for VLE and pressure-enthalpy diagrams of R134a/R23/R14 zeotropic mixtures

作　　者：张庆庆[1] 张华[1] 娄江峰[1] 李佳[1] 赵巍[1] 王袭[2] 刘占杰[2] 

机构地区：[1]上海理工大学制冷与低温工程研究所,上海200093 [2]海尔集团技术研发中心,山东青岛266101

出　　处：《化工学报》2015年第7期2387-2394,共8页CIESC Journal

基　　金：国家自然科学基金项目(51176124);国际科技合作项目(2012DFR70430)~~

摘　　要：基于PR状态方程,分模块模拟计算了三级自动复叠制冷系统中R134a/R23/R14三元混合工质的热物理特性参数,得到非共沸混合工质的汽液平衡数据、两相组分,并利用干度计算焓熵值,构建了典型配比下混合工质的压焓图和汽液相平衡图。二元R134a/R23和R32/R134a混合工质的泡点压力和气相组分的计算值与实验测试值的误差分别小于1.3%、1.2%和1.0%、2.4%;三元R32/R125/R134a混合工质95%的计算值与实验值的偏差在±5%之内,表明该模型能满足工程计算需要。利用理论模型,结合实验系统,对R134a/R23/R14三级自动复叠制冷系统进行详细的组分等热物性分析,并在空间压焓图上进行了详细表述。The thermodynamic properties of R134a/R23/R14 ternary mixtures used in three-stage auto-cascade refrigeration systems were calculated based on the PR equation, and enthalpy and entropy were calculated by using dryness. The diagrams of pressure-enthalpy and VLE of R134a/R23/R14 mixture under the typical composition were given. The deviations of bubble pressure and vapor composition between simulation results and the experimental data were less than 1.3%and 1.2%for R134a/R23, 1.0%and 2.4%for R32/R134a, respectively. The deviations of 95%calculated values of R32/R125/R134a were between ＆#177;5%. The simulation results could meet the requirements of engineering calculation. Based on the experiment, the thermodynamic properties of the auto-cascade refrigeration system were analyzed in detail. The pressure-enthalpy diagrams of R134a/R23, R23/R14 and R134a/R23/R14 under the operating compositions were given, and the diagram of spatial pressure-enthalpy described the circle of this system clearly. This simulation program could analyze the system circle effectively.

关 键 词：自动复叠制冷 混合物 PR状态方程 热力学性质 计算机模拟 压焓图 

分 类 号：TB657.3[一般工业技术—制冷工程]