Hydraulic characteristics of variable chilled water flow systems based on the terminal device pressure difference control
Chen Dingyi, Liu Jinxiang, Xu Wenlong, Chen Xiaochun, Li Ning, Yuan Xiaoqing
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.