Vehicle air conditioning system and method for using humidity controlling device

A vehicle air conditioning system, comprising:

• an air conditioning duct through which air can flow;
• at least one humidity controlling device comprising:
• a honeycomb structure having an outer peripheral wall and partition walls provided on an inner side of the outer peripheral wall, the partition walls defining a plurality of cells, each of the cells extending from a first end face to a second end face of the honeycomb structure to form a flow path for the air;
• and a moisture absorbing layer provided on a surface of each of the partition walls, the humidity controlling device being provided in the air conditioning duct;
• and
• a control unit configured to control a flow velocity of the air flowing through the cells of the humidity controlling device,
• wherein the control unit comprises controlling the flow velocity of the air flowing in the humidity controlling device to 0.23 to 1.40 m/s in a moisture absorption process of the humidity controlling device.