在科威特等环境温度较高的国家，夏季的温度可能会超过52°C（125.6°F）。因此，在高温下运行空调会产生较低的性能系数（COP），从而影响能效比（EER）。发展中国家现在面临着在空调行业逐步淘汰R22等氟氯烃的挑战。此外，他们正在转向R410A等HFC制冷剂。本研究的目的是为高温国家寻找除R22之外的替代制冷剂。 对制冷量为12.4kW的基准制冷剂R22空调机组进行了实验测试。试验在35°C（95°F）和46.1°C（114.98°F）的室外温度下进行。因此，开发了该模型。分析包括使用替代制冷剂对实际和理想蒸汽压缩空调循环进行建模。实际蒸汽压缩循环的部件包括压缩机、蒸发器、节流阀和冷凝器。在对循环进行建模时，考虑了包括压力和温度降在内的损失。 对R410A、R290和R32等不同类型的制冷剂进行了模拟，并将其性能与R22进行了比较。使用工程方程求解器（EES）进行建模和仿真。记录并解释了制冷剂性能的变化。与典型工况下的性能相比，试验制冷剂在46.1°C（114.98°F）下的性能有所下降。分析表明，R32具有最高的性能系数，因此建议作为未来的替代方案。 引文:2016年3月14日至16日在科威特召开的第六届国际能源研究与开发会议

In high ambient temperature countries such as Kuwait, the temperature in the summer can well exceed 52°C (125.6°F). As a result, the operation of airconditioning at high temperatures yields a low coefficient of performance (COP), hence affecting the energy efficiency ratio (EER). Developing countries are now facing the challenges of phasing out HCFCs such as R22 in the air-conditioning sector. Also, they are in the process of shifting to HFC refrigerants such as R410A. The aim of this study is to find an alternative refrigerant other than R22 for high ambient temperature countries. Experimental testing was carried out for R22 air-conditioning units, the baseline refrigerant, with a cooling capacity of 12.4kW. The tests were performed at outdoor temperatures of 35°C (95°F) and 46.1 °C (114.98°F). Consequently, the model was developed. The analysis comprises modeling actual and ideal vapor compression air-conditioning cycles with alternative refrigerants. The components of the actual vapor compression cycle consist of a compressor, evaporator, throttling valve and condenser. Losses including pressure and temperature drops are taken into consideration when modeling the cycle. Different types of refrigerants including R410A, R290 and R32 were simulated and their performances were compared to that of R22. Modeling and simulations were executed using Engineering Equation Solver (EES). Variations in the performance of refrigerants are noted and explained. The tested refrigerants have demonstrated deterioration in their performance at 46.1°C (114.98°F) compared to their performance at a typical operating regime. The analysis depicts that R32 has the highest coefficient of performance, thus recommended as a future alternative.