The analysis of common problems of refrigerant affects cold storage temperature.

- May 04, 2018-

The analysis of common problems of refrigerant affects cold storage temperature.


Refrigerant is an important factor affecting the cold storage temperature. If the throttle valve is improperly regulated or blocked, it will directly affect the refrigerant flow into the evaporator.

For this reason, Vrcoolertech Refrigeration reminds you to pay constant attention to the condition of the refrigerant.

When the cold storage valve opening degree is too large, the refrigerant flow is too large, the evaporation pressure and the evaporation temperature will also increase, the warehouse temperature drop rate will slow down.

At the same time, when the opening degree of the throttle valve is too small or blocked, the flow of the refrigerant will also decrease, the cooling capacity of the system will also decrease, and the temperature drop of the warehouse will also slow down.

Generally, it can be judged whether the throttle valve refrigerant flow is appropriate by observing the evaporation pressure, the evaporation temperature and the frosting condition of the suction pipe.

Throttle plugging is an important factor affecting the flow of refrigerant. The main causes of blockage of the throttle valve are ice blocking and dirty plugging.

The reason why the ice blocking is caused by the poor drying performance of the dryer is that the refrigerant contains moisture. When the refrigerant passes through the throttle valve, the temperature drops below 0°C, and the moisture in the refrigerant freezes to block the orifice of the throttle valve.

Dirty plugging is due to the accumulation of more dirt on the inlet filter screen of the throttle valve, and the circulation of the refrigerant is not smooth, resulting in blockage.

There are two main reasons why the amount of refrigerant in the system is insufficient and the capacity of the refrigerant is insufficient for the lack of refrigerant circulation.

One is that the refrigerant charge is insufficient. At this time, only a sufficient amount of cold storage refrigerant can be added.

Another reason is that there is a large amount of refrigerant leakage in the system. In this case, leakage points should be searched first, and the pipelines and valve connections should be inspected. After the leaks are repaired, a sufficient amount of refrigerant can be filled.

The efficiency of cold storage compressors is low, and the cooling capacity cannot meet the cold storage warehouse load requirements.

Because of the long-term operation of the compressor, cylinder sleeves, piston rings and other components are severely worn and the gap increases. As a result, the sealing performance will be reduced accordingly, and the compressor's gas delivery coefficient will also be reduced. The cooling capacity will be reduced.

When the cooling capacity is less than the heat load of the warehouse, the temperature of the warehouse will decrease slowly.

By observing the suction and discharge pressure of the compressor, the cooling capacity of the compressor can be roughly judged.

If the compressor's cooling capacity drops, the common method is to replace the compressor's cylinder liner and piston rings.

If the replacement still fails, you should consider other factors, or even dismantle the machine overhaul, eliminate the fault factor.


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