The article discusses a method to save energy in central air conditioning systems by optimizing the control of chilled water temperature and flow. By adjusting these variables based on the cooling load of each room, significant power savings of up to 22% can be achieved compared to traditional methods. The study shows that by coordinating the control of chilled water temperature and flow, the system can operate more efficiently, reducing power consumption while maintaining comfort levels in the building. The highest power-saving rate is observed in December at 36.7%, with the least savings in July at 14.5%.