融霜工况影响下空气源热泵机组频率控制系统  

Frequency control system of air source heat pump unit underthe influence of defrosting conditions

作　　者：杨立伟[1] YANG Liwei(Renmin University of China,Beijing 100872,China)

机构地区：[1]中国人民大学,北京100872

出　　处：《现代电子技术》2024年第3期115-118,共4页Modern Electronics Technique

摘　　要：空气源热泵机组在融霜工况下,由于外部环境温度低,机组内部的水箱和管路可能会结霜,导致传热效率下降、能耗增加,使得频率控制不精准。为此,设计融霜工况影响下空气源热泵机组频率控制系统。设计PLC频率控制结构、频率控制中央处理器与PID控制阀门,联合控制热源侧水泵变频。计算机组结霜量,获取换热器的有效集热量。基于分段调节思想,利用计算机调整侧水泵出水量和调节参数,计算融霜启动调频速度。由实验结果可知,所设计系统在不同融霜工况下控制效果与实际最为接近,控制结果误差最大仅为0.1 Hz,能够实现精准控制频率。Under defrosting conditions,the air source heat pump unit may experience frost formation in the internal water tanks and pipelines due to low external environmental temperature,which results in a decrease in heat transfer efficiency and an increase in energy consumption,and furthermore results in inaccurate frequency control.Therefore,a frequency control system for air source heat pump unit under the influence of defrosting conditions is designed.The PLC frequency control structure,frequency control central processor and PID control valve are designed,which aims to jointly control the frequency conversion of the heat source side water pump.The effective heat collection of the heat exchanger is obtained based on the frost formation rate of the computer group.On the basis of the idea of segmented regulation,a computer is used to adjust the water output and adjustment parameters of the side water pump,and the defrosting start frequency modulation speed is calculated.The experimental results show that the designed system has the closest control effect to the actual situation under different defrosting conditions,with a maximum control error of only 0.1 Hz.Therefore,the designed system can achieve precise frequency control.

关 键 词：融霜工况 空气源热泵机组 频率控制 融霜停止段 融霜启动段 分段控制 

分 类 号：TN622.2-34[电子电信—电路与系统]