跨临界二氧化碳循环设备及性能分析

Trans-critical CO_2 Recycle Unit and Performance Analysis

CO2作为制冷剂具有良好的特性。基于此,在掌握压缩机内部结构及跨临界CO2循环影响因素的基础上,将跨临界CO2循环与R134a循环进行性能比较,得出在双级压缩中使用中间冷却器可降低排气温度,同时作为膨胀装置的毛细管能使工作稳定,即采用滚动转子式二级CO2压缩机、中间冷却器和毛细管节流,可获得高效跨临界CO2制冷循环。结果表明,跨临界CO2循环具有比R134a循环更优异的性能。

CO2 as refrigerant has satisfactory performance. Therefore, based on the internal structure of compressor and the influence factors of trans-critical CO2 recycle, the researcher makes performance comparison between trans-critical CO2 recycle and R134a recycle, obtaining the conclusion that in the two ,stage compression, it can reduce the exhaust temperature to use intermediate cooler, and at the same time, the capillary as the expansion device can make the work stable. That is to say, it can make efficient trans-critical CO2 refrigeration recycle to use rolling piston two-stage CO2 compressor, intermediate cooler and capillary restriction. The results show that trans-critical CO2 recycle has more excellent performance than R134a recycle.