| 摘要: |
| 本文研究了R32变频滚动转子式制冷系统，实验分析了压缩机运行频率、吸排气压比、蒸发温度对不同吸气状态下压缩机电效率变化规律的影响，并以此建立了适用于吸气过热和吸气带液的压缩机电效率模型。结果表明：1)在相同压比、相同蒸发温度下，压缩机电效率均随电子膨胀阀开度的变大呈线性下降趋势，且吸气带液段斜率大于吸气过热段，即压缩机吸气带液时，压缩机电效率下降程度更大；2)相同压比下，蒸发温度越高，电效率越小；相同蒸发温度下，压缩机压比越高，电效率越小。同时，压缩机压比越高，蒸发温度对压缩机电效率的影响越大；3)验证工况下模型计算值与实际值最大相对误差为1.83%，最小相对误差为0.03%，具有较好的可靠性；4)压缩机在低频率下运行时性能会恶化，此时模型的准确性会降低，因此模型适用于压缩机频率高于额定频率、吸气干度大于0.88的工况。 |
| 关键词: 变频压缩机 电效率 模型 两相 |
| DOI： |
| Received:June 23, 2017 |
| 基金项目:上海市动力工程多相流动与传热重点实验室(13DZ2260900)资助。 |
|
| Operation Performance and Modeling for R32 Variable Frequency Rotary Compressor under Varied Operating Conditions |
|
Yu Zhongyang, Tao Leren, He Jun, Yuan Zhaoyang
|
| (Institute of Refrigeration and Cryogenics, University of Shanghai for Science and Technology) |
| Abstract: |
| To model the electrical efficiency of a compressor that can apply a suction refrigerant state under both superheated and two-phase conditions, the performance of an R32 variable frequency rotary compressor, which varies with the compressor frequency, pressure ratio, and evaporating temperature, is analyzed in this paper. The results show that when the system is at a fixed pressure ratio and evaporating temperature, the electrical efficiency linearly decreases with the declining superheated temperature and an increase in suction vapor quality. Moreover, the slope under two-phase suction is above that under superheated suction. In addition, the electrical efficiency of the system at a fixed pressure ratio is inversely proportional to the evaporating temperature, and that of the system at a fixed evaporating temperature is also inversely proportional to the pressure ratio. The more the pressure ratio varies, the smaller the influence of the evaporating temperature. To demonstrate the precision of the model, the theoretical value is compared with the experiment results in this paper. The maximum of relative error is 1.83%, and the minimum is 0.03%. The performance of a compressor at low frequency will deteriorate, which leads to the inaccuracy of the model, and therefore the model is suitable for operating conditions with a frequency higher than the rated frequency and a suction vapor quality higher than 0.88. |
| Key words: variable frequency compressor electrical efficiency modeling two phase |
