楼宇空调变水量冷媒水系统实时优化控制

On-line Optimal Control of Variable Water Volume Systems in HVAC Systems

为达到节能和优化系统控制的目的 ,在楼宇空调水系统及其局部控制仿真分析的基础上 ,针对变流量系统监测点和可调参数较多的特点 ,提出并验证了 3个实时优化控制方案 :根据初级和二级冷媒水流量的比率 ,实时优化多台冷水机组的启 /停控制 ;利用 AHU自动控制水阀的阀位信息 ,实时优化二级水泵的控制 ;利用 AHU自动控制水阀的阀位信息以及二级泵的工作状况 ,实时优化冷水机组出水温度的控制 .结果表明 ,同常规的控制方案相比 ,这 3个优化控制方案不仅能够不同程度地达到节能的目的 。

For the aim of saving energy and optimizing control of chilled systems, the performance of VWV systems and characteristics of control systems were analyzed based on the simulation. According to the characteristic of the monitored parameters and controlled variables in VWV systems, three online optimal control strategies were proposed and validated: (1) Optimal strategy for on/off control of chillers according to the ratio of secondary flow rate to primary flow rate. (2) Optimal strategy for the control of secondary pump according to value positions of auto controlled AHU vales. And (3) Optimal strategy for supply chilled water temperature control of chillers according to valve positions of auto controlled AHU valves and working status of secondary pump. The results show that the three optimal strategies can save energy and improve the control performance of systems compared with the conventional control strategies.