Aiming to explore environmentally friendly working fluids replace R134a for automotive air conditioning applications, seven potential pure refrigerants were analyzed first in terms of safety, environmental characteristics, and cycle performances. It was found that the pure refrigerants have some defects when applied individually. However, using the principle of complementary advantages, the mixtures employed in automotive air conditioning can make up for the shortcomings existing in the pure refrigerants. On this basis, the thermophysical models of vapor-liquid equilibrium, enthalpy, entropy, and critical properties of binary mixtures were established. Also, the properties and cycle performances of 14 blends were investigated, and the results indicated that the predicted models of vapor-liquid equilibrium have high accuracy, where the average absolute relative deviations of pressures and the average absolute deviations of vapor-phase mole fractions were less than 2% and 0.005, respectively. M1 (R13I1/R152a [30/70]) and M11 (R13I1/R290 [40.3/59.7]) showed superiorities in cycle performances and environmental and safety characteristics. Moreover, the operating pressures of which were close to that of R134a, and they were expected to become the substitutes for R134a in automotive air conditioners.

中文翻译：

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R134a替代制冷剂在汽车空调系统中的性能评价

为了探索在汽车空调应用中替代 R134a 的环保工质，首先从安全性、环境特性和循环性能方面分析了七种潜在的纯制冷剂。发现纯制冷剂单独使用时存在一些缺陷。但是，利用优势互补的原则，汽车空调所采用的混合物可以弥补纯制冷剂存在的不足。在此基础上，建立了二元混合物气液平衡、焓、熵和临界性质的热物理模型。此外，对14种共混物的性能和循环性能进行了研究，结果表明汽液平衡预测模型具有较高的准确性，其中压力的平均绝对相对偏差和气相摩尔分数的平均绝对偏差分别小于 2% 和 0.005。M1 (R13I1/R152a [30/70]) 和 M11 (R13I1/R290 [40.3/59.7]) 在循环性能以及环境和安全特性方面表现出优越性。而且其工作压力接近R134a，有望成为R134a在汽车空调中的替代品。