Direct cooling type water cold storage air-conditioning system and operating method thereof

The invention discloses a direct cooling type water cold storage air-conditioning system, which comprises a refrigerating host, a cold storage water tank, a cold storage pump, a cooling pump, an air-conditioning tail end and a bypass pipe, wherein an inlet of the refrigerating host is connected with an outlet of the cold storage pump; the outlet of the refrigerating host is connected with an electric valve F2 through a pipeline and then divided into two branches by the electric valve F2; one branch is an air-conditioning tail end branch, and the other branch is a cold storage water tank branch; the air-conditioning tail end and the cold storage water tank are respectively connected with an inlet pipeline of the cold storage pump; an electric regulating valve V6 is arranged on the inlet pipeline of the cold storage pump; the air-conditioning tail end branch is connected with the bypass pipe in parallel; and an electric regulating valve V5 is arranged on the bypass pipe. The invention also discloses an operating method for the direct cooling type water cold storage air-conditioning system. By the invention, the return water temperature of a refrigerating unit is reduced, the refrigerating unit is unloaded to operate in the optimum energy efficiency, the aim of improving the efficiency of a water chilling unit is fulfilled, the efficiency of the system can be integrally improved, the cold storage amount of a water cold storage device is completely utilized, and the operating cost is reduced to the greatest extent.