The screw-type chiller unit, named after its critical component – the compressor, consists of gaseous refrigerant in a state leaving the evaporator. After undergoing adiabatic compression by the compressor, it becomes a high-temperature, high-pressure state. The compressed refrigerant gas is then cooled and condensed in the condenser at constant pressure, transforming into liquid refrigerant.

Subsequently, it expands through an expansion valve to low pressure, becoming a gas-liquid mixture. The low-temperature, low-pressure liquid refrigerant absorbs heat from the cooled substance in the evaporator, transitioning back into a gaseous state. The gaseous refrigerant re-enters the compressor through pipelines, initiating a new cycle. These four processes-compression, condensation, throttling, and evaporation—constitute the primary working principle of a screw-type water chiller unit.

Depending on the method of heat dissipation, screw chillers can be categorized as either water-cooled or air-cooled. Water-cooled systems effectively dissipate heat using natural cooling tower water circulation, while air-cooled screw chillers utilize finned air for environmental cooling