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There are many ways to design the cold storage tank, the common ones are the series design of the primary pumps, the parallel design of the primary pumps and the common design of the secondary pumps. The following is a detailed explanation of the design structure of the first and second pumps in parallel.

1. The first-stage pump is connected in parallel:

(1) Cooling mode: During the cooling period of the main engine and the cold storage tank, the refrigeration pump runs, the cold storage tank and the system operate in parallel, the cooling valve is opened, the host side supplies cooling to the end, and the cold storage tank is charged at the same time;

(2) Cold storage mode: After the cold storage is completed, close the cooling valve, and the host only supplies cooling to the end. According to the temperature of the cold storage tank, open the charging valve in time to supplement the cooling to the cold storage tank.

(3) Cooling mode: After the power is off, the chiller and refrigeration pump stop working, start the cooling pump, close the cooling valve, the UPS supplies power to the cooling valve and the cooling pump, and the cold storage tank supplies cooling to the end.

(4) When the mains is restored and the cooling machine is restarted, turn off the cooling pump and open the cooling valve, so that the chiller supplies cooling to the terminal equipment and stores cooling in the cooling storage tank.

2. Common design of secondary pump:

(1) Cooling mode, when the flow rate of the first stage pump is equal to the flow rate of the second stage pump, the water flow from the primary pump is just sent away by the secondary pump, the water does not flow through the cold storage tank, and the chiller directly supplies cooling to the load.

(2) Complete cooling mode, when the power failure or the cooling machine fails, the - - secondary pump stops working, the flow is zero, the water flow circulated by the secondary pump completely flows through the cold storage tank, the cold storage tank is in the cooling mode, and the load is completely controlled by Cold storage tank undertakes.

(3) In the charging and cooling mode, when the cooler and the primary pump return to work, the flow rate of the secondary pump is greater than that of the secondary pump, and the cooler will flow through the cold storage tank for cooling while bearing the load.

(4) Partial cooling mode, when the flow rate of the primary pump is less than that of the secondary pump, the cold storage tank supplements part of the water flow, and the cold storage tank and the chiller combine to supply cooling to the load.