R32/R1234ze(E)混合物黏度实验与模型研究

Viscosity Measurements and Modeling for the Binary Mixture of R32/R1234ze(E)

随着巴黎协议和基加利修正案的陆续颁布,传统的CFCs和HCFCs类制冷剂因其过高的GWP值将被淘汰,故寻找新型高效环保的制冷工质面临着巨大的压力和挑战。目前开发新型制冷工质的方法之一是优势互补,取长补短,即将HFOs类环保制冷剂与高效的HFCs类制冷剂混合使用,其中R32/R1234ze(E)因其优良的热物理性质受到研究人员的广泛关注。本文采用振动弦法黏度计对R32/R1234ze(E)混合物黏度进行了实验研究,实验的温度范围为263~363 K,压力范围为2~30 MPa.实验系统黏度测量的不确定度为2%。在获得大量实验数据的基础上,利用硬球模型对R32/R1234ze(E)混合物黏度计算模型进行了研究,获得了基于纯质黏度硬球模型及混合法则的混合物黏度计算方程,并与实验数据进行了对比,结果表明与实验数据的平均绝对偏差为0.7%,最大绝对偏差为2.8%。本文的研究工作为替代制冷剂的研究提供了基础数据。

With successively entering into force of the Paris Agreement and Kigali Amendment,the traditional refrigerants like CFCs and HCFCs will be scheduled for phase out because of their excessively high GWP.Therefore,looking for the new environmentally friendly and high efficient refrigerants is imminent.The trans-1,3,3,3-tetrafluoropropene(R1234ze(E)) and its mixtures are among the most suitable commercial candidates.Although the thermophysical properties are critical for the selection of the potential refrigerant,only a few studies have been conducted on the thermophysical properties of refrigerant mixtures containing R1234ze(E).In this work,the liquid viscosity of binary refrigerant mixture R32+R1234ze(E) at different mole fraction was measured at temperatures from 263 to 350 K and at pressures up to 30 MPa using the vibrating wire viscometer.The overall uncertainty of the results is 2%.The measurements were correlated with the hard-sphere scheme.Comparisons of the experimental data with the values calculated from the correlations were presented.The average absolute deviation and the maximum absolute deviation from the correlation are 0.7% and 2.8%,respectively.