The working principle of the ceiling chiller is mainly to draw air into the machine through the fan, and reduce the air temperature by evaporating heat dissipation. When the chiller is running, the compressor compresses the refrigerant into a high-pressure gas, which is then fed into the evaporator. In the evaporator, the refrigerant evaporates by absorbing heat from the air, thereby reducing the temperature of the air. Subsequently, the cooled air is blown out by the fan to achieve the effect of ventilation and cooling in the workshop.