降低制冷系统压缩机排气温度的方法研究

Research on Method of Reducing Compressor Exhaust Temperature in Refrigeration System

针对R32制冷系统排气温度高的问题,课题组从系统性能、可行性等方面分析讨论了目前主流的4种方法(中间补气法、两级压缩法、喷液法以及湿压缩法)的优劣,建立了小型变流量冷水机组,采用湿压缩的方法来优化R32制冷系统压缩机排气温度过高的问题。研究结果表明:对于R32制冷系统,采用湿压缩的方法来降低排气温度为较好选择;滚动转子式压缩机的结构特性使得针对R32制冷系统的排气温度降低的问题有了很好的解决方案;标准空调工况下,湿压缩的方法可显著改善R32排气温度。实际工程中可通过控制压缩机吸气口干度值来降低R32的排气温度,获得最优系统性能系数。

For the problem of high exhaust temperature of R32 refrigeration system, the feasibility of the advantages and disadvantages of four methods of the current mainstream （second gas-injection, two-stage compression, liquid spray and wet compression） was analyzed and discussed from the aspects of system performance. A small variable flow chiller was set up, emphasizing the use of wet compression to optimize the exhaust temperature of the R32 refrigeration system. The results show that： the wet compression method is the best choice to reduce the exhaust temperature for R32 refrigeration system ; the structural characteristics of the rolling rotor compressors make a good solution to the problem of the exhaust temperature of the R32 refrigeration system; under the condition of standard air conditioning, the wet compression method can significantly reduce the R32 exhaust temperature. In practical engineering, the exhaust temperature of R32 system can be reduced by controlling the suction dryness of the compressor, and the optimal system performance coefficient can be obtained.