Water dispenser

A water dispenser comprising:

• a filter unit filtering raw water supplied from a raw water supply unit to produce purified water;
• a cold water tank assembly comprising:
• a cooling water accommodation unit to hold cooling water, and
• a cold water generating flow channel immersed in the cooling water,
• wherein the produced purified water is passed through the cold water generating flow channel immersed in the cooling water in the cooling water accommodation unit to produce cold water;
• a refrigerating cycle device having a compressor, a condenser, an expansion device, and an evaporator installed on an inner side of the cold water tank assembly, to maintain the cooling water filled in the cooling water accommodation unit at a low temperature;
• a cooling water flow channel connected to the cold water tank assembly and supplying the water to the cooling water accommodation unit;
• a flow rate sensor installed in the cooling water flow channel to measure a flow rate of water supplied to the cooling water accommodation unit through the cooling water flow channel;
• a stirrer protruding from an inner upper wall of the cold water tank assembly to stir the cooling water filled in the cooling water accommodation unit;
• and
• a controller to stop the supply of water to the cooling water accommodation unit on the basis of a water supply amount measured by the flow rate sensor, and to determine whether the cooling water has been filled up to a reference water level on the basis of a rotation speed of the stirrer per unit time.