R290/CO2复叠式制冷系统的性能实验

通过对R290／C02复叠式制冷系统的性能实验，对低温循环用CO2作为制冷工质，高温循环分别用R22和R290为制冷工质的性能进行比较，结果表明，随着蒸发温度的升高，冷凝温度的降低，R290／CO2复叠式制冷系统的最佳质量流量比增大，COP增加。随着高温循环压缩机入口温度的升高，R290压缩机的功耗略高于R22压缩机的功耗，R290循环的COPh要高于R22循环的COPh。结果表明自然工质R290／CO2复叠式制冷系统具有很好的发展前景。

Performance Experiment of R290/CO2 Cascade Refrigeration System

Performance experiments of R290/CO2 cascade refrigeration system were conducted. The performance of a cascade refrigeration system having a high temperature cycle using R290 as refrigerant and a CO2 based low temperature cycle was compared with that of a cascade refrigeration system having a high temperature cycle using R22 as refrigerant and a CO2 based low temperature cycle. The results show that the optimum mass flow rate ratio and the maximum COP of the R290/CO2 cascade refrigeration system increase with the increase of evaporation temperature and with the decrease of condensation temperature. Moreover, the power consumption of the R290 compressor is slightly higher than that of the R22 compressor and the COPh of the R290 cycle is higher than that of the R22 cycle at the higher compressor inlet temperatures.