Cold water tank assembly

A cold water tank assembly, comprising:

• a cold water tank having an inlet pipe and an outlet pipe through which purified water flows, an accommodation space therein, and a length in a first direction;
• a partition wall including at least one first partition wall configured to divide the accommodation space in a second direction in a plate shape with an XZ plane, and at least one second partition wall configured to cross the first partition wall and divides the accommodation space in a third direction in a plate shape with an XY plane, and dividing the accommodation space into a plurality of heat exchange flow path zones having a length in the first direction and adjacent to each other in the second direction or third direction;
• and
• an evaporator through which refrigerant flows, the evaporator including a main line configured to be inserted into the accommodation space and withdrawn to the outside while sequentially passing through the plurality of heat exchange flow path zones and configured to be arranged to pass through the heat exchange flow path zones in the first direction, and a connection line with which an end of the main line is bent so that the main line adjacent is connected, and
• wherein the partition wall forms an opening passage through which the connection line and the purified water pass while communicating the adjacent heat exchange flow path zones, and
• wherein purified water at room temperature introduced into the first heat exchange flow path zone is extracted as purified water at low temperature passing through the last heat exchange flow path zone while forming at least one rising flow in the third direction.