The operation principle of the air cooler and the air cooled chiller is similar. They both make use of the characteristics of heat absorption and heat release process required by the state transformation of the refrigerant, and achieve the purpose of refrigeration and cold air straight out through heat transfer.

The cooling fan is mainly composed of refrigeration system, air supply system and control system. Its working principle can be summarized as follows: after the operation of the equipment, the fan is started, and the refrigerant absorbs the heat energy of the air and vaporizes in the evaporator. The compressor continuously extracts the vaporized refrigerant from the evaporator and compresses it into high temperature and high pressure steam. The refrigerant is sent into the condenser in the form of steam for heat exchange with air, and condenses into liquid refrigerant after heat release. After reducing the pressure through the throttle mechanism, it enters the evaporator, again absorbs heat and vaporizes, absorbing the heat of the wind blown by the fan, and so repeatedly circulates, making the equipment continuously provide cold air.