中文摘要：

太阳能喷射制冷系统具有变工况间歇性工作特点,优良制冷工质特性是太阳能喷射制冷系统获得良好循环性能至关重要条件。因此,优化选择绿色环保替代工质对扩大太阳能喷射制冷系统工作温区和寻找太阳能喷射制冷系统的最佳变工况工作特性具有重要理论意义。文中在建立改进型太阳能喷射制冷系统热力学模型基础上,研究了以R161、R1234yf、R152a、R290、R134a及R600a为制冷剂的太阳能喷射制冷系统变工况热力学特性。结果表明,以R161为制冷剂的太阳能喷射制冷系统的性能系数平均（COP）值最高,其变工况循环性能明显优于R134a和R600a等制冷工质;绿色环保新型制冷剂R161是适用于喷射制冷系统变工况运行的优良替代工质。

英文摘要：

The modified solar jet refrigeration system has the off - design characteristics of intermittent operating condition. Excellent refrigerant is the key to obtain good cycle performance of solar jet refrigeration systems. Therefore, optimization selec- tion of the new environment - friendly alternative refrigerant has theoretical significance of wide temperature range application of the solar jet refrigeration system and achieves the optimal operating characteristics of solar jet refrigeration system. Based on the thermodynamic model of the solar jet refrigeration system, the off - design thermodynamic characteristics of the system with R161, R1234yf, R152a, R290, R134a and R600a as refrigerants were studied. The results indicate that the solar jet refrigera- tion system using R161 as refrigerant is superior to that using other refrigerants due to its highest coefficient of performance （COP） under the same operating conditions. The cycle performance using R161as refrigerant under off- design condition is sig- nificantly better than that using R134a and R600a. The environment friendly alternative refrigerant R161 is suitable for the solar jet refrigeration system under the off- design conditions.