Cooling system for a data center

A cooling system for a data center, wherein a plurality of cabinets are accommodated into the data center, each of the cabinets is provided with a plurality of integrated circuit boards, and the cooling system comprises:

• at least one liquid-cooling heat exchanger disposed above each of the integrated circuit boards, to dissipate heat from a first heat source disposed on the integrated circuit board through an internal circulation coolant in the liquid-cooling heat exchanger;
• a liquid-cooling distributing device comprising a first pipeline in communication with the liquid-cooling heat exchanger, a second pipeline in communication with a first cooling tower, and a heat exchanger configured to cool the internal circulation coolant from the liquid-cooling heat exchanger to a first temperature through an external circulation coolant from the first cooling tower;
• and
• the first cooling tower configured to cool the external circulation coolant supplied via the second pipeline to a second temperature, wherein the first temperature is higher than the second temperature.