Design and problem analysis of secondary water pumping distribution system

Secondary water pumping distribution system is a common kind of chilled water distribution system used in HVAC design of large scale buildings. Presents the flow resistance characteristics and the applicability of the secondary water pumping distribution system. Studies the static characteristics of the terminal coil and the water system, and analyses the causes of chilled water system bypass pipe backflow and “small temperature difference, large flow rate” operation. Recommends moderately increasing terminal unit cooling capacity, precisely selecting control valve size, matching the primary pump head with the secondary pump lift during design practice, as well as performing preliminary commissioning and operation management.