针对部分制冷工质排气温度较高的现象，将不完全湿压缩方法应用于转子式制冷系统，通过在不同频率下改变压缩机的吸气状态（过热至不完全湿压缩），研究了系统循环性能及核心部件的热力特性。实验结果表明：不完全湿压缩下存在一个最佳干度控制范围0<x<0.96，在该区间内制冷量提升5.1%~5.5%，制冷性能系数（Coefficient of Performance,COP）提升5.4%~5.8%，排气温度较过热段改善20%以上，系统性能得到了明显提升；当吸气干度范围在0<x<0.96时，压缩机的热力性能基本维持良好，相较于过热段的极大值处，容积效率降低仅1%~2%，电效率降低亦仅1%~2%；不完全湿压缩下，压缩机频率的变化对系统性能及压缩机热力性能影响均较大；将压缩机运行于最佳干度范围区间0<x<0.96的较低频或是额定频率附近将获得最优综合效率。

Aiming at the phenomenon that the exhaust temperature of some refrigerants is high,the incomplete wet compression method is applied to the rotor refrigeration system.By changing the suction state (superheating to incomplete wet compression) of the compressor at different frequencies,the cycle performance of the system and the thermodynamic characteristics of the core components are studied.The experimental results show that there is an optimal range of quality under incomplete wet compression 0<x<0.96.Within this optimal range,the cooling capacity increases by 5.1%-5.5% and COP increases by 5.4%-5.8% and the exhaust temperature is 20% lower than the superheat section,leading to significantly improved system performance..With the suction quality in the range of 0<x<0.96,the thermal performance of the compressor is in good shape; compared to the maximum value of the superheating section,the volumetric efficiency is reduced by only 1%-2%,and the electrical efficiency is reduced by only 1%-2%.With the incomplete wet compression,the change of the compressor frequency has a great influence on the system performance and the thermal performance of the compressor.Running the compressor in the range of the best quality 0<x<0.96 or near the rated frequency will lead to the best overall efficiency.

TK123

上海市动力工程多相流动与传热重点实验室项目(13DZ2260900)