R513A的饱和液相黏度特性研究

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。

Study on the saturated liquid viscosity characteristics of R513A

The working fluid viscosity is very important for the design and optimization of refrigeration systems. R513A is expected to be the main alternative refrigerant for R134a in chiller/heat pump due to its good environmental protection characteristics and thermal cycle performance. In order to further explore the viscosity characteristics of R513A, a liquid viscosity measurement system for refrigerant was designed and built based on the capillary method, and the capillary viscometer was calibrated using R134a as the standard liquid. The saturated liquid viscosity of R513A was measured in the temperature range of 253.15—333.15 K. The results showed that the saturated liquid viscosity of R513A was slightly lower than that of R134a. The saturated liquid viscosity of R513A 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 R513A well, and the research results can provide important references for the alternative applications of R513A.