R32和R32/R1234yf混合工质黏度实验测量及模型

本文针对含HFOs类混合制冷剂黏度开展实验和模型研究。采用振动弦法黏度计对R32纯质和R32/R1234yf混合制冷剂黏度进行了实验测量,测量的温度范围分别为263~350 K、263~360 K,压力最高均为30 MPa,实验系统黏度测量的不确定度为2%。本文共获得了177组实验数据,利用得到的实验数据,基于硬球模型分别拟合了R32纯质和R32/R1234yf混合制冷剂黏度方程。R32纯质黏度实验数据与方程的平均绝对偏差为0.28%,最大绝对偏差为0.92%;R32/R1234yf混合工质黏度实验数据与方程的平均绝对偏差为0.69%,最大绝对偏差为2.09%。由此可见,实验数据和黏度模型吻合较好,为R32和R32/R1234yf混合制冷剂的应用研究提供了重要参考依据。

Viscosity Measurements and Modeling for R32 and Binary Mixture of R32/R1234yf

Recently, the Paris Agreement which many nations agreed to limit greenhouse gas emissions, has come into effect. According to the agreement, many of the compounds currently used in the refrigeration sector are scheduled for phase out due to ozone depletion concerns and/or contributions to global warming. There is current interest in developing working fluids with low global warming potential (GWP). One such fluid is 2,3,3,3-tetrafluoroprop-1-ene (R1234yf). 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 R1234yf. In this work, we focused on the viscosity of R32 and the binary mixture of R32 + R1234yf. The liquid viscosity of R32 and binary mixture of R32 + R1234yf were presented over the temperature ranges of (263 to 350) K and (263 to 360) K at pressures up to 30 MPa using the vibrating wire viscometer. The measurements of mixtures containing the mole fraction (0.2448, 0.4108, 0.6086 and 0.8356) of R32 were carried out. The overall uncertainties of these results were ±2.0 %. The experimental results of the pure R32 and the mixture were correlated with hard-sphere scheme. The average absolute deviations between the experimental results and the correlations were 0.28 % for R32 and 0.69 % for R32 + R1234yf, and the maximum absolute deviations were 0.92 % and 2.09 %, respectively. Comparisons between measurements of this work and literatures were also presented.