摘要
建立了异程式与同程式布置的旁通压差控制冷冻水系统仿真模型。采用关闭某一支路,计算其它支路水力失调度的方法,分析了末端采用通断调节时,系统水力稳定性随压差监测点位置的变化规律。结果表明:压差监测点位置离冷源越远,系统整体的水力稳定性越差;用户支路距离压差监测点越近,其稳定性越好,同时干扰性越强;旁通压差控制的压差监测点宜设置在旁通管两端。在冷源侧采用温差控制水泵变频调节后,管网的水力稳定性明显提升。
A direct return and reversed return chilled water system simulation network with bypass differential pressure control is established.By the method that shutting certain subcircuit,and computing hydraulic imbalance degree of other subcircuits,then the influence of the position of the differential pressure signal on the hydraulic stability of the system with on-off valves at the terminal is analyzed.The result indicates that the farther away from the cold source,the worse the hydraulic stability of the system is as a whole,the closer the subcircuit to the position of pressure difference feedback signal,the better the stability,while the stronger the interference of the subcircuit is.So it＇s best to use the bypass loop as the signal taking position.When the pump frequency adjustment based on the temperature difference control is applied in the cold source side,the hydraulic stability of the pipe network significantly improved.
关键词
异程
同程
旁通压差控制
水力稳定性
压差监测点
温差控制
direct return
reversed return
bypass pressure difference control
hydraulie stability
position of differential pressure signal
temperature difference control
