定压差下空调冷冻水管网系统特性研究

Research on Air Conditioning Chilled Water Piping Network with Constant Differential Pressure

针对定压差变流量空调水系统,综合考虑管网水力特性与热力特性,建立了冷冻水管网系统模型。模拟研究了最不利主动支路在总管定压差控制策略下,处于不同工况时对被动支路水力及热力特性的扰动情况,以及对应的管网特性曲线和水泵工作状态点变动状态。结果表明,管路水力稳定性与热力稳定性较差时可高达16%左右,较好为1%左右,并且随被动支路与主动支路距离增大而变好。

For a given pressure variable flow air conditioning system, considering the pipe network hydraulic characteristics and thermal characteristics and a frozen water pipe network system model was established. Simulation studies have been operated about the disturbance, while the most unfavorable initiative branch in main tube given under pressure control strategy affect the dynamic changes of hydraulic and thermal properties of passive branch in different operating conditions, and the pipe network characteristic curve and pump operating point change state corresponding to the state. The results showed that hydraulic stability and thermal stability of the pipeline is the worse about 16%, preferably about 1%, and with the distance＇ s increases of the passive and active branch, the effect get better.