流体机械

2020, v.48;No.575(05) 76-81

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VRF制冷系统频率与阀开度同步控制模型与试验验证
Synchronous Control Model and Experimental Verification of Frequency and Valve Opening of VRF Refrigeration System

胡鹏荣;陶乐仁;何俊;虞中旸;
Hu Pengrong;Tao Leren;He Jun;Yu Zhongyang;Institute of refrigeration and cryogenics,University of Shanghai for Science and Technology;

摘要(Abstract):

针对变流量制冷(VRF)系统压缩机频率与电子膨胀阀开度的精确控制,以及控制元件所引起的滞后或超调现象,以变频滚动转子式制冷系统为研究对象,分别通过定频率变阀开与定阀开变频率2个试验,得到二者单独控制下的曲线拟合,并建立二者在不同工况下的同步控制模型。结果表明:系统质量流量与电子膨胀阀开度呈二次项关系,随阀开度的增大而增大,与压缩机频率呈一次项线性增长关系;频率与阀开度同步控制模型经试验验证,实际值与计算值最大相对误差为3.99%,最小相对误差为0.04%,具有较好的可靠性;以系统质量流量为控制目标,得到频率、阀开度与蒸发温度值,便可建立该同步控制模型,大大简化频繁调节系统的时间损失,同时可以使系统迅速达到稳定状态。
In order to control the accurate of compressor frequency and electronic expansion valve opening of Variable Refrigerant Flow(VRF) systems,and hysteresis or overshoot caused by control components,by taking the variable frequency rolling rotor refrigeration system as the research object,two experiments constant frequency variable valve opening experiment and constant valve opening change frequency experiment were conducted,and the curve fitting under the independent control of the two experiments was obtained,and the synchronous control models of the two under different working conditions were established.The results show that the system mass flow rate has a quadratic relationship with the opening degree of the electronic expansion valve,which increases with the increase of the valve opening degree,and shows a linear growth relationship with the compressor frequency.The frequency and valve opening synchronization control model was experimentally verified.The maximum relative error between the actual value and the calculated value was 3.99%,and the minimum relative error was 0.04%.It had good reliability.By taking the system mass flow as the control target and obtaining the frequency,valve opening and evaporation temperature values,the synchronous control model can be established,which greatly simplifies the time loss of the frequent system adjustment and at the same time enables the system to reach a steady state quickly.

关键词(KeyWords): 压缩机;阀开度;模型;稳定性;同步控制
compressor;valve opening;model;stability;synchronous control

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基金项目(Foundation): 上海市动力工程多相流动与传热重点试验室资助项目(13DZ2260900)

作者(Author): 胡鹏荣;陶乐仁;何俊;虞中旸;
Hu Pengrong;Tao Leren;He Jun;Yu Zhongyang;Institute of refrigeration and cryogenics,University of Shanghai for Science and Technology;

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