The reason why the chiller can play the role of cooling is because of the credit of the refrigerant. Then I have to test everyone, do you know what refrigerants are often used in water-cooled screw chillers, and how are they generally filled into the equipment? Many people don’t know about the application, it doesn’t matter, here is the detailed explanation of this aspect, and everyone can read it carefully.
Although there are many types of refrigerants, such as Freon, unsaturated hydrocarbon refrigerants, inorganic compound refrigerants, etc., for water-cooled screw chillers, R-22 type refrigerants are usually used . The main chemical component of this refrigerant is difluoro-chloromethane, and the cooling effect achieved is still good.
After selecting the refrigerant, it will be filled. The filling process is very strict, and it is necessary to ensure that there is no leakage in the refrigeration system. We can generally fill in two ways, one is to fill from the bypass hole of the compressor discharge valve, and the other is to complete the filling work from the bypass hole of the suction valve.
The former is to inject Freon liquid directly into the chiller system, which is more direct, fast and safe, but this method is only limited to the case where there is no refrigerant in the system and it has been evacuated or filled for the first time. If Freon vapor is poured in this way, there is a certain danger.
In the latter filling method, the compressor must be started during the process, and the injected refrigerant cannot be liquid, so as to avoid the phenomenon of liquid hammer. Therefore, this method is mostly used when the system filling volume is insufficient and needs to be supplemented.
It seems that no matter which method is used to fill the refrigerant of the chiller, there are some drawbacks, so I am busy, I must pay attention to it when operating, and choose different methods for different situations to avoid accidents. .