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The state of the screw chiller unit from the evaporator is a gas refrigerant; after being adiabatically compressed by the compressor, it becomes a high temperature and high pressure state. The compressed gas refrigerant is condensed by isostatic cooling in a condenser, and after condensation, it is changed into a liquid refrigerant, and then expanded to a low pressure through a throttle valve to become a gas-liquid mixture. The liquid refrigerant under low temperature and low pressure absorbs the heat of the cold matter in the evaporator and becomes a gaseous refrigerant again. The gaseous refrigerant re-enters the compressor through the pipeline and begins a new cycle.
The above are the four processes of the refrigeration cycle. It is also the main working principle of the screw chiller.
Shangyi water-cooled screw series chiller
What should be paid attention to when charging the screw chiller refrigeration system with refrigerant?
Before carrying out work, we should ensure that the test leaks are qualified and the equipment pipeline is insulated and the paint construction is completed.
Refrigerant cylinders, benches, scales, nozzles, leak detection tools, rubber gloves, etc. should be prepared before filling the refrigerant;
For the small Freon system, the gas filling method can be used, and the system is filled with Freon by the "multiple port" on the suction valve of the compressor;
When filling the system from the filling port to the system, the dryer should be connected to the filling port to ensure the dryness of the Freon charged in the system;
Before and after the refrigerant is filled, the refrigerant cylinders shall be weighed and recorded, and the accumulated refrigerant injection amount;
In order to speed up the filling, the cloth may be covered with a cloth or cotton yarn immersed in warm water (40 ° C), or the steel bottle may be sprayed with water below 40 ° C;
When the evaporator of the screw chiller is of the horizontal shell and tube type, special attention should be paid to ensure the circulating flow of the brine so as to prevent the refrigerant in the heat transfer tube from freezing and bursting the heat transfer tube;
Regarding the calculation of the refrigerant charge in the chiller refrigeration system: it should be calculated according to the internal volume of the equipment. When calculating, only the volume of the equipment and pipeline containing the refrigerant liquid in the system should be counted;
When the refrigerant charge reaches 80-90% of the designed charge, the charge can be suspended and the system can be tested. If the system is running normally, it means that the charge is appropriate; if it is found that the charge is insufficient, it can continue to be charged. Do not overfill at one time to avoid unnecessary troubles and safety accidents.
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