Impact of air on the system

First of all, we should know that 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 refrigeration effect.

The existence of non condensable gas does great harm to the refrigeration system, which is mainly reflected in the increase of system condensation pressure, condensation temperature, compressor exhaust temperature and power consumption. Nitrogen enters the evaporator and cannot evaporate with the refrigerant; It will also occupy the heat exchange area of the cold storage evaporator, so that the refrigerant can not be fully evaporated and the refrigeration efficiency will be reduced; At the same time, too high exhaust temperature may lead to carbonization of lubricating oil, affect the lubrication effect, and burn down the refrigeration compressor motor in serious cases.

Effect of oxygen in the air on the system:

Oxygen and nitrogen are also non condensable gases. We have analyzed the hazards of non condensable gases above, and we will not repeat here. However, it should be noted that compared with nitrogen, if oxygen enters the refrigeration system, it also has these hazards:

The oxygen in the air will react with the refrigeration oil in the refrigeration system to produce organic matter, and finally form impurities, which enter the refrigeration system, resulting in dirty blockage and other adverse consequences.

Oxygen and refrigerant, water vapor, etc. are easy to form acid chemical reaction, which will oxidize the refrigeration oil. These acids will damage all 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 without any problems at first. As time goes by, they will eventually lead to the damage of the cold storage compressor. The following figure illustrates these problems well.

Effects of other gases on refrigeration system:

Water vapor affects the normal operation of the refrigeration system. The solubility in Freon liquid is the smallest, and the solubility decreases gradually with the decrease of temperature. The most intuitive impact of water vapor on the refrigeration system is as follows, which we will explain in graphic way:

There is water in the refrigeration system. The first impact is the throttling structure. When the water vapor enters the throttling mechanism, the temperature decreases rapidly, and the water reaches the freezing point, resulting in icing, blocking the small through hole of the throttling structure, resulting in the failure of ice blockage.

The water vapor from the corroded pipeline enters the refrigeration system, and the water content of the system increases, resulting in corrosion and blockage of pipelines and equipment.

Produce sludge deposits. In the process of compressor compression, water vapor encounters high temperature and refrigeration oil, refrigerant, organic matter, etc., resulting in some series of chemical reactions, resulting in motor winding damage, metal corrosion and formation of sludge deposits.

To sum up, in order to ensure the effect of refrigeration equipment and prolong the service life of refrigeration equipment, it is necessary to ensure that there is no empty gas in the refrigeration system. Therefore, the air should be excluded from the system in the correct way. In the practical application of refrigeration system, sediment and corrosion will cause blockage and failure of expansion valve, filter dryer and filter screen. The only reliable way to make the refrigeration system discharge the water vapor in the air is to take the correct operating steps and use the deep vacuum pump.

For the newly installed unit, the vacuum pump must be used to vacuum the whole refrigeration system. It is not allowed to use the compressor of the unit to vacuum the system, otherwise it may cause irreparable damage to the compressor.

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