Vehicle air conditioning system

A vehicle air conditioning system, comprising:

• at least one humidity controlling device configured to adsorb and desorb moisture;
• an air conditioning duct having the humidity controlling device provided therein and allowing air from a vehicle interior or a vehicle exterior to flow therethrough, the air conditioning duct having a first flow path for allowing the air to flow into the vehicle interior on a downstream side of the humidity controlling device and a second flow path for discharging the air to the vehicle exterior;
• a valve configured to switch the flow of the air between the first flow path and the second flow path;
• a ventilation fan configured to adjust a flow rate of the air flowing through the air conditioning duct;
• and
• a control unit configured to control the humidity controlling device, the valve and the ventilation fan,
• wherein, when executing an adsorption mode in which the valve is switched so that the air flows into the first flow path to adsorb the moisture to the humidity controlling device, the control unit controls the ventilation fan so that a temperature Ta of a window glass in the vehicle interior is higher than a dew point temperature Tb in the vehicle interior, to adjust the flow rate of the air.