变风量空调系统环状管网水力特性分析

Analysis on Hydraulic Characteristics of Annular Pipe Network in Variable-Air-Volume Conditioning System

依据阻抗增益模型和流体网络理论,以环状管网变风量空调系统(VAV)3个典型末端装置的可调性和稳定性分析为基础,通过试验测定相关参数后建立了系统的MATLAB仿真模型,对系统调节时管网的水力工况特性变化规律及调节稳定性进行了研究。仿真结果表明,多个末端装置开度同时变化时,单个VAV末端装置的可调范围约为30°~70°,且一个末端支路自身阻抗越大,被影响程度越小,水力工况稳定性越高。

Based on the impedance gain model,fluid network theory and the analysis of the adjustability and stability of three typical terminal devices of variable air volume air conditioning system(VAV)in a circular pipe network,the MATLAB simulation model of the system is established after measuring relevant parameters,the characteristics of the change of hydraulic condition and the stability of the system are studied.The simulation results show that the multiple terminal device opening change at the same time,a single VAV terminal device with adjustable range is about 30°~70°,the greater the impedance of a terminal branch,the smaller the degree of influence,the better the stability of hydraulic conditions