化工学报2025，Vol.76Issue(z1)：9-16,8.DOI:10.11949/0438-1157.20241420
R290/R245fa汽液相平衡混合规则对比研究
Comparative study on mixing rules of vapor-liquid equilibrium for R290/R245fa
摘要
Abstract
R290/R245fa constitutes a non-azeotropic refrigerant pair suitable for auto-cascade ejector refrigeration cycles.However,the scarcity of experimental data and significant discrepancies among prediction models pose challenges.To enhance the accuracy of vapor-liquid equilibrium(VLE)data calculations for the R290/R245fa binary mixture,this paper utilizes the Peng-Robinson(PR)equation in conjunction with three mixing rules:the van der Waals(VDW),Wong-Sandler(WS),and Modified Huron-Vidal first-order(MHV1)mixing rules.Additionally,it employs the UNIFAC(Dortmund)activity coefficient model to evaluate the VLE properties of the mixture.The results indicate that the MHV1 mixing rule exhibits superior computational accuracy for low-pressure systems compared to the WS and VDW mixing rules.Considering the impact of hydrogen bonding forces among fluorinated hydrocarbon molecules on the vapor-liquid phase composition,the optimal model modifies the area and volume parameters of fluorine-containing groups within the activity coefficient model.This modification reduces the average relative deviation of pressure to 0.7937%and lowers the absolute deviation of the vapor-phase component to 0.0018.The prediction results demonstrate that the accuracy of the modified model is comparable to that of REFPROP 10.0,with a relative deviation of pressure between the modified model and REFPROP 10.0 amounting to 0.7051%,and an absolute deviation of the vapor-phase component of 0.0025.Finally,utilizing the modified parameters,the phase diagram for the R290/R245fa mixed refrigerant is plotted within the temperature range of 243.15 K to 283.15 K.关键词
二元混合物/活度系数/汽液平衡/碳氢化合物/氢键Key words
binary mixtures/activity coefficient/vapor-liquid equilibria/hydrocarbon/hydrogen bond分类
能源与动力引用本文复制引用
丁昊,王林,刘豪..R290/R245fa汽液相平衡混合规则对比研究[J].化工学报,2025,76(z1):9-16,8.基金项目
国家自然科学基金项目(52376005,52378094) （52376005,52378094）
