摘要
工质黏度对于制冷系统的设计优化至关重要。R513A因其良好的环保特性和热力循环性能,在冷水/热泵机组中有望成为R134a的主要替代制冷剂。为了进一步探究R513A的液相黏度特性,基于毛细管法设计搭建了制冷剂液相黏度测试系统,采用R134a作为标准液体对毛细管黏度计进行标定。在温度范围253.15~333.15 K内,开展了R513A的液相黏度实验研究,结果表明R513A的液相黏度略低于R134a。采用R-K多项式方程、硬球模型结合混合规则与实验数据进行关联,R-K方程计算值与实验值的平均绝对偏差(AAD)和最大绝对偏差(MAD)分别为0.71%、1.65%,硬球模型计算值与实验值的平均绝对偏差和最大绝对偏差分别为2.02%和3.39%。上述两种模型能够较好地预测R513A的饱和液相黏度,研究结果可为R513A的替代应用研究提供参考依据。
The working fluid viscosity is very important for the design and optimization of refrigeration systems.R513 A is expected to be the main alternative refrigerant for R134 a in chiller/heat pump due to its good environmental protection characteristics and thermal cycle performance.In order to further explore the viscosity characteristics of R513 A,a liquid viscosity measurement system for refrigerant was designed and built based on the capillary method,and the capillary viscometer was calibrated using R134 a as the standard liquid.The saturated liquid viscosity of R513 A was measured in the temperature range of 253.15—333.15 K.The results showed that the saturated liquid viscosity of R513 A was slightly lower than that of R134 a.The saturated liquid viscosity of R513 A were predicted by using R-K polynomial equation,hard sphere model with mixing rule,the average absolute deviation and maximum absolute deviation were 0.71%and 1.65%by R-K equation,the average absolute deviation and maximum absolute deviation were 2.02%and 3.39%by RSH method.It can be seen that the above two models can predict the saturated liquid viscosity of R513 A well,and the research results can provide important references for the alternative applications of R513 A.
作者
陈裕博
杨昭
武晓昆
吕子建
张勇
CHEN Yubo;YANG Zhao;WU Xiaokun;LYU Zijian;ZHANG Yong(Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,Tianjin University,Tianjin 300350,China;State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation,Zhuhai 519070,Guangdong,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第11期5502-5509,共8页
CIESC Journal
基金
国家自然科学基金重点项目(51936007)。
关键词
制冷剂
R513A
黏度
混合物
实验验证
模型预测
refrigerant
R513A
viscosity
mixtures
experimental validation
model prediction
