利用制冷循环：通风管道设备常常使用制冷循环系统，该系统由压缩机、冷凝器、膨胀阀和蒸发器等组成。通过制冷剂在不同状态下的变化，实现空气的降温。

Utilizing refrigeration cycle: Ventilation pipeline equipment often uses a refrigeration cycle system, which consists of a compressor, condenser, expansion valve, and evaporator. By changing the refrigerant in different states, air cooling is achieved.

蒸发冷却：通风管道设备中的蒸发器利用制冷剂的蒸发过程吸热，从而降低管道中空气的温度。通过将空气与冷却的蒸发器表面接触，使空气中的热量传递给制冷剂，从而降低空气的温度。

Evaporative cooling: The evaporator in ventilation duct equipment uses the evaporation process of refrigerant to absorb heat, thereby reducing the temperature of the air in the duct. By contacting the surface of the cooled evaporator with air, the heat in the air is transferred to the refrigerant, thereby reducing the temperature of the air.

湿度调节：通风管道设备的降温原理中，湿度调节也起着重要的作用。通过控制蒸发器的温度和湿度，可以实现对空气湿度的调节。适当的湿度调节有助于增加空气的舒适度和降低室内温度。

Humidity regulation: In the cooling principle of ventilation duct equipment, humidity regulation also plays an important role. By controlling the temperature and humidity of the evaporator, it is possible to adjust the air humidity. Proper humidity regulation helps to increase air comfort and reduce indoor temperature.

空气循环：通风管道设备通过循环送风，将降温后的空气均匀地输送到目标区域，实现全面的降温效果。同时，通过排出热空气，保持通风系统的稳定工作状态。

Air circulation: Ventilation duct equipment circulates air to evenly deliver the cooled air to the target area, achieving a comprehensive cooling effect. Meanwhile, by discharging hot air, the ventilation system is maintained in a stable working state.

系统控制：通风管道设备降温原理中的系统控制是关键。通过采用智能控制系统，可以控制制冷循环和湿度调节等参数。

System control: The system control in the cooling principle of ventilation duct equipment is crucial. By adopting an intelligent control system, parameters such as refrigeration cycle and humidity regulation can be controlled.