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The water-cooled screw chiller is mainly composed of a semi-closed screw compressor, a shell and tube condenser, a dry filter, a thermal expansion valve, a shell and tube evaporator, and an electric control part.

When the water-cooled screw chiller is cooled, the compressor sucks the low-temperature and low-pressure refrigerant in the evaporator into the cylinder, and the compressor vapor is compressed into high-temperature and high-pressure gas, and enters the condenser through the exhaust pipe. The high temperature and high pressure refrigerant gas exchanges heat with the cooling water in the condenser, transfers heat to the cooling water, and the refrigerant gas condenses into a high pressure liquid. The high pressure liquid from the condenser is throttled and depressurized by the thermal expansion valve and then enters the evaporator. In the evaporator, the low-pressure liquid refrigerant absorbs the heat of the chilled water and vaporizes, so that the chilled water is cooled and cooled to become the required low-temperature water. The vaporized refrigerant gas is again sucked into the compressor for compression, and is discharged into the condenser, so that it is continuously circulated and continuously circulated, thereby achieving cooling of the chilled water.

The chilled water from the water-cooled screw chiller enters the indoor fan coil, the variable air volume air conditioner and other end devices, and exchanges heat with the convective air indoors. In this process, the water absorbs the heat of the indoor air. The indoor air is dissipated while the temperature rises, and the indoor air passes through the indoor heat exchanger, and the temperature drops, and is driven into the room by the fan, thereby reducing the temperature of the indoor air, and the chilled water after the temperature rises is restarted by the water pump. Enter the unit and cycle so as to achieve the purpose of continuous cooling.