空调二级(次)泵系统的最小阻力控制
Resistance minimization control for a secondary pumploop in air conditioning systems
摘要：
介绍了空调二级(次)泵系统变水量的最小阻力控制、定末端压差控制和变末端压差控制。定末端压差控制作为空调二级(次)泵系统变水量控制最原始的控制方法,存在诸如末端压差采样点选择难、定末端压差设定值确定难、流量减小时调节阀的局部阻力不减反增等缺陷。变末端压差控制虽然比定末端压差控制节能,但应用起来很复杂。最小阻力控制充分借助楼宇自动控制系统的信息监控功能,根据二级(次)泵系统中各调节阀的开度调节二级(次)泵的转速,简单且有效地解决了定末端压差控制和变末端差压控制存在的问题。
Abstract：
This paper presents the resistance minimization control method of the variable water volume for the secondary pump loop in air conditioning systems, as well as methods of the constant terminal differential pressure control and the variable terminal differential pressure control. As the earliest variable water volume control method for the secondary pump loop, the constant terminal differential pressure control suffers from several drawbacks such as difficulty in selecting the measuring position for terminal differential pressure, uncertainty in determining the setpoint and an increased local resistance at control valves when the flow decreases. The variable terminal differential pressure control achieves better energy saving but is complex to implement. In contrast, the resistance minimization control leverages the monitoring capabilities of the building automation system (BAS) and adjusts the secondary pump speed based on the opening degree of the control valves. This method effectively resolves the limitations of the traditional differential pressure control methods while offering a simpler and more energy-efficient solution.
Keywords:air conditioning; secondary pump; variable water volume; resistance minimization control; constant terminal differential pressure control; variable terminal differential pressure control; control valve; opening degree