Vehicle air conditioning system

A vehicle air conditioning system, comprising:

• a humidity controlling device having an adsorption portion containing an adsorbent configured to adsorb moisture at a temperature lower than or equal to a predetermined temperature and to desorb the moisture when the temperature exceeds the predetermined temperature, and a heating means configured to heat the adsorption portion;
• a duct comprising the humidity controlling device therein and allowing air from a vehicle interior or a vehicle exterior to flow therethrough, the duct having a vehicle interior flow path for introducing the air that has passed through the humidity controlling device into the vehicle interior, and a vehicle exterior flow path for discharging the air that has passed through the humidity controlling device to the vehicle exterior,
• wherein the vehicle air conditioning system is formed by satisfying at least one of (1) and (2) as follows:
• (1) a wall is erected from an inner bottom surface of the duct between the humidity controlling device and the vehicle interior flow path or in the vehicle interior flow path, or an inlet of the vehicle interior flow path is provided at a position higher than the inner bottom surface of the duct;
• and
• (2) at least one drain hole is provided at the inner bottom surface of the duct between the humidity controlling device and the vehicle interior flow path or in the vehicle interior flow path.