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从高技术应用的要求出发，论述了纯质及氮－烃类混合工质的不足，用ＰＲ方程分析了成分配比对二元氮－氟里昂混合工质节流循环特性的影响，指出合理的成分配比对二元氮－氟里昂混合工质是十分必要的。并以不同温度下的△Ｈ＿Ｔ为目标函数，优化计算了一些二元氮，氟里昂低温混合工质的最佳成分配比。
Based on the requirements of high-tech applications, the insufficiency of pure and nitrogen-hydrocarbon mixtures was discussed. The influence of composition ratio on the throttling cycle characteristics of binary nitrogen-freon mixture was analyzed by PR equation. Component ratio of binary nitrogen - Freon mixed refrigerant is very necessary. And the △ H_T under different temperatures as the objective function to optimize the calculation of some binary nitrogen, freon low temperature mixed refrigerant the best ratio of ingredients.