Abstract: An ideal cycle model of air refrigeration with water injection is established to analyze the influence of pressure ratio and water injection amount on the thermal performance of the system and to compare with the ordinary air refrigeration cycle. The research results show that: the air cooling cycle with water injecting can not only improve the cooling capacity of the system, but also not lead to a significant reduction in the air supply temperature, which is more suitable for air-conditioning, Compared with the ordinary air refrigeration cycle, when the circulating pressure ratio of the system is greater than 2, the COP of the system after injecting water is about 2 times of the former, and the air refrigeration cycle with spraying water has more advantages

Key words: Water injection, Air cooling, Compression ratio, Coefficient of performance