High efficiency operation control strategy of variable volume water system in central air conditioning systems

Analyses the variable volume operation characteristics of chillers, chilled water pumps and cooling water pumps, and the hydraulic balance control of air conditioning terminals. Proposes a control strategy to operate the variable volume water system of central air conditioning systems in a high efficiency way in the whole year. Points out that the air conditioning terminals can realize variable volume and high efficiency operation by adopting dynamic pressure difference plus proportional integral electric integrated balancing valve control, electric two-way valve temperature difference control and proportional two-way valve precise control based on data analysis.