Possible reasons for frosting in screw-type refrigerators

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1. Insufficient refrigerant. When there is a lack of refrigerant, the evaporation temperature of the chiller is low. When this evaporation temperature drops below zero degrees, frost forms on the evaporator fins; this frost layer hinders ventilation and reduces the heat exchange efficiency of the evaporator. As a result, the refrigerant that does not evaporate flows into the return pipe and the compressor where it continues to evaporate.     2. The dry filter is partially clogged. A clogged filter reduces the amount of refrigerant supplied, causing the evaporation temperature of the chiller to drop. Frost forms on the evaporator fins, and the refrigerant that does not evaporate completely flows into the return pipe and the compressor where it continues to evaporate.     3. The expansion valve is set too low or is clogged. This reduces the amount of refrigerant supplied, causes the evaporation temperature of the air conditioner to be low, frost forms on the evaporator fins, and the unevaporated refrigerant flows into the return pipe and compressor to continue evaporating.     4. The screw-type freezer has poor ventilation. This results in poor heat exchange efficiency of the evaporator; the refrigerant does not fully evaporate and flows back into the return pipe and the compressor to continue evaporating, thereby causing frost to form on the compressor and the return pipe.     5. There are dead bends and dents in the liquid supply pipeline. This reduces the amount of refrigerant supplied, causes the evaporation temperature of the air conditioner to be low, frost forms on the evaporator fins, and the unevaporated refrigerant flows into the return pipe and compressor to continue evaporating.     6. The air filter is too dirty. It prevents proper ventilation of the chiller, resulting in poor heat exchange efficiency of the evaporator.     In summary, these are the reasons for frost forming on the lower part of the compressor in industrial refrigerators; we need to understand well what has been mentioned above.