Based on the energy saving theory of variable frequency drive pump

this paper analyzes the energy saving method in the design and operational control of central air-conditioning chilled water system. In the design process

different pump characteristic curve apply to different conditions

and the principle of choosing maximum efficiency point of water pump is analyzed. In the control process

the different installation position of central air-conditioning chilled water variable primary flow system differential pressure sensor has the different impact on energy saving effect. When the change trend of the end load of the system is consistent

the most energy efficient way is locating the differential pressure sensor at the end of the system.