Impact of air on refrigeration systems

05-12-2019

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      1. The effect of nitrogen on the refrigeration system

      Nitrogen is a non-condensable gas. The so-called non-condensable gas means that the gas circulates in the system with the refrigerant, does not condense with the refrigerant, and does not produce a cooling effect.

      The presence of non-condensable gases is very harmful to the refrigeration system. Nitrogen enters the evaporator and cannot evaporate with the refrigerant; it also occupies the heat exchange area of the evaporator, making the refrigerant unable to fully evaporate, and the cooling efficiency is reduced; at the same time, the exhaust gas temperature may cause carbonization of the lubricant, affecting Lubrication effect, burn the motor of refrigeration compressor when serious.

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2. The impact of oxygen on the refrigeration system

     Oxygen is also a non-condensable gas. If oxygen enters the refrigeration system, it also has these hazards:

     1) The oxygen in the air will chemically react with the refrigeration oil in the refrigeration system to produce organic matter, and finally form impurities, enter the refrigeration system, causing undesirable consequences such as dirty plugging.

     2) Oxygen reacts easily with refrigerants, water vapor, etc. to form acids that oxidize the frozen oil. These acids will damage various components of the refrigeration system and damage the insulation layer of the motor. At the same time, these acid products will stay in the refrigeration system. As time goes on, the compressor is finally damaged.

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     3.  Impact of other gases (water vapor) on the refrigeration system

     1) When the water vapor enters the throttling mechanism, the temperature rapidly decreases and the water reaches the freezing point, resulting in icing, blocking the small through holes of the throttling structure, and causing the fault of ice blocking.

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      2) Corrosion of pipes.

      3) Generate sludge deposits.

In summary, in order to ensure the effectiveness of the refrigeration equipment and extend the life of the refrigeration equipment, it must be ensured that there is no non-condensable gas in the refrigeration, and the refrigeration system must be evacuated.

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