Cooling system

A cooling system comprising:

• a heat exchange unit including a heat transfer pipe group which includes a plurality of heat transfer pipes linearly extending in a vertical direction and having an air passage formed therein and in which coolant passages are formed between the heat transfer pipes by bundling the heat transfer pipes at intervals, a casing covering the heat transfer pipe group so that both ends of each heat transfer pipe open to the outside, a coolant supply section supplying a coolant into the casing, and a coolant discharge section discharging the coolant from the inside of the casing;
• and
• an air blower that is provided below the heat exchange unit and blowing air to the heat transfer pipe group from below,
• wherein the air blower includes an impeller that is rotatable around an axis extending in a vertical direction and a drive unit that is disposed below the impeller and rotationally driving the impeller, and
• wherein the cooling system further comprises:
• an upper housing having a tubular shape extending in a vertical direction to surround the impeller from an outer peripheral side, forms an air flow path therein, and has an upper end connected to a lower end of the heat exchange unit;
• and
• a lower housing including an inner annular wall decreasing in diameter upward while covering the drive unit from an outer peripheral side and an outer annular wall decreasing in diameter upward while covering the inner annular wall from an outer peripheral side and forming an air introduction flow path to the impeller together with the inner annular wall.