Dimethyl ether (DME) is a popular medium widely used in industrial applications. Being highly flammable substance, only recently it has again found commercial use as a primary working fluid in cooling and heating systems. Known as refrigerant RE170, it is now considered to be one of the potential natural refrigerants of the future due to minimal Global Warming Potential and zero Ozone Depletion Potential.

Two novel azeotropic ternary mixtures of RE170/R1234yf/R152a were developed in order to improve cooling capacity and performance of a dimethyl ether refrigeration cycle. The mass ratios were purposefully selected to offer high cycle efficiency COP, high specific cooling capacity $q_e,$ small specific volume of vapour, reduced compressor power requirements, and the smallest possible temperature glide.

The mixtures were subjected to experimental analysis in order to establish to what degree the added fluids (R1234yf and R152a) influence boiling and heat transfer performance. Boiling curves and heat transfer coefficients were determined experimentally and compared with the values obtained for pure RE170. Finally, several known heat transfer coefficient correlations (suitable for both hydrocarbons and synthetic refrigerants) were applied to the resulting data and evaluated for accuracy by evaluation of MAPE. The Cooper correlation was the most accurate for for ternary mixtures of dimethyl ether in the broadest range of temperatures, heat fluxes, and compositions (MAPE between 3.5-19.8). In order to improve the accuracy even further, the original Cooper correlation was modified with the acentric factor and the molecular mass power factor was optimised for modern chloride-less refrigerants. Resulting equation, when applied to ternary mixtures, returns errors below 5% in the entire range of experimental data.

二甲醚（DME）是一种广泛用于工业应用的流行介质。作为高度易燃的物质，直到最近它才再次在商业上用作冷却和加热系统中的主要工作流体。由于其最小的全球变暖潜能值和零臭氧消耗潜能值，因此被称为制冷剂RE170，现在被认为是未来的潜在天然制冷剂之一。

开发了两种新型的RE170 / R1234yf / R152a共沸三元混合物，以提高制冷能力和二甲醚制冷循环的性能。有目的地选择质量比以提供高循环效率COP，高比制冷量$q_{Ë}，$蒸气的体积较小，压缩机功率要求降低，并且温度滑移尽可能小。

为了确定添加的流体（R1234yf和R152a）对沸腾和传热性能的影响程度，对混合物进行了实验分析。通过实验确定沸腾曲线和传热系数，并将其与纯RE170的值进行比较。最后，将几种已知的传热系数相关性（适用于碳氢化合物和合成制冷剂）应用于所得数据，并通过评估MAPE来评估准确性。对于最广泛的温度，热通量和组成（MAPE在3.5-19.8之间）范围内的二甲醚三元混合物，库珀相关性最准确。为了进一步提高精度，最初的库珀相关性已通过偏心因子进行了修改，并且分子质量功率因数已针对现代的无氯制冷剂进行了优化。将所得方程式应用于三元混合物时，在整个实验数据范围内返回的误差均低于5％。