Abstract: An airflow driving device includes an airflow-guiding member for receiving and guiding an airflow. The airflow-guiding member includes a first opening and a second opening. The open areas of the first opening and the second opening are different such that a pressure difference is generated between the first opening and the second opening. According to the pressure difference, a flow rate of the airflow passing through the airflow driving device is calculated.

Abstract: A humidity-adjusting air conditioner includes a casing, a heat exchanger, a humidifier and an airflow driving device. The heat exchanger is disposed within the casing for transferring heat of an airflow. The heat exchanger includes a primary duct and a secondary duct. The secondary duct includes a valve. The valve is selectively opened or closed to control whether the secondary duct transfers heat of the airflow. The humidifier is disposed beside a flow path of the airflow for humidifying the airflow. The airflow driving device is disposed within the casing for driving the airflow.

Abstract: An air-conditioning system is used in a data center. The air-conditioning system includes plural electronic apparatuses, plural air conditioners and plural airflow blocking structures. The plural airflow blocking structures are arranged in airflow paths of respective air conditioners. If one of the plural air conditioners is disabled, the airflow blocking structure of the disabled air conditioner is automatically closed to block a low flow-resistance path and adjust the airflow paths.