基于末端压差控制的变流量空调水系统水力特性
Hydraulic characteristics of variable chilled water flow systems based on the terminal device pressure difference control
摘要：
研究了一级泵变流量风机盘管系统在末端压差控制下的水力特性，结果表明：当系统各支路调试平衡后，任一支路末端用户作为信号取点，部分负荷下系统的水力工况基本类似；控制信号取点用户的启闭对整个系统的影响显著，应将信号取点设置在长期用冷较为稳定的位置；上游用户工况变化对下游用户影响不大，而下游用户工况变化严重影响了上游用户；压差信号取点支路各空调用户工况改变会造成系统水力严重失调，提出了针对此种情况的变压差控制算法。
Abstract：
Researches the hydraulic characteristics of the system with fan coil units, concluding that after the branches have been regulated to a balance state, the part-load hydraulic condition is substantially similar no matter which terminal user of branches is used as the signal taking position. The opening and closing of the signal taking user has a significant impact on the whole system, so it should be fixed at long-term cooling and much steadier room. Changing conditions of an upstream user has little influence to the downstream user, while the change of the downstream greatly affects the upstream. In view of the fact that the change of the users which belong to pressure difference signal taking branch will result in great hydraulic disorder of the whole system, presents a variable pressure difference control computing method.
Keywords:hydraulic characteristic, terminal loop pressure difference control, pressure difference set point, hydraulic balance, hydraulic disorder