This article analyzed the energy-saving methods and technologies of the circulating pump in central air conditioning system. It focused on improving the efficiency of circulating pump impeller

which was regarded as an energy-saving method. The design of air conditioning circulating pump impeller can be efficiently improved using CFD skill. Internal flow field results of air conditioning circulating pump impeller can be achieved by computing flow numerical

based on which the performance of air conditioning circulating pump can be predicted. Furthermore

this method can improve the performance and efficiency of impeller in the whole operation field and guaranteen the energy-saving of central air condition system by adjusting related geometric parameters of impeller and maintaining its good flow state.