What Is The Difference Between Cold Dryer And Suction Dryer？

From the perspective of dryness, the dehydration performance of the adsorption dryer is better than that of the cold dryer, and it can remove a large amount of water. The pressure dew point of the adsorption dryer can reach -20℃ to -70℃.
From the perspective of energy consumption, the cold dryer is better than the adsorption dryer. The cold dryer does not require regeneration gas consumption, while the adsorption dryer consumes part of the gas consumption during the regeneration process, which will increase the cost of the enterprise.

Different working principles:
The cold dryer is based on the principle of freezing and dehumidification. The saturated compressed air from the upstream is cooled to a certain dew point temperature through heat exchange with the refrigerant, and a large amount of liquid water is condensed. After separation by the gas-liquid separator, it is automatically discharged from the machine, thereby achieving the purpose of dehydration and drying.
The adsorption dryer is based on the principle of pressure swing adsorption. The compressed air is contacted with the desiccant under a certain pressure, and most of the water is adsorbed in the desiccant. The dry air enters the downstream to work, thereby achieving the purpose of deep drying.

Differences in dehydration effect:
The cold dryer is restricted by its principle. If the temperature is too low, ice will appear. Therefore, the dew point temperature is usually between 2 and 10°C.
The desiccant dryer does not need to change temperature, and the desiccant (aluminum oxide) can perform deep drying, so the dew point temperature at its outlet can usually reach below -20°C, which means that deep drying can be achieved.

Differences in energy loss:
For the cold dryer, because the refrigerant needs to be compressed to work to achieve the purpose of cooling, the power supply power will be higher.
And the desiccant dryer only needs to control the valve through the electric control box, so the power consumption is usually only about tens of watts, which means that there will be no power loss.

Different gas loss
Because the cold dryer achieves the purpose of water removal by changing temperature, and the water is discharged from the machine through the automatic drain, there is no gas loss;
For the suction dryer, the desiccant needs to be regenerated after saturation with water, so there is a need for about 12-15% regeneration gas loss;

Different failure rates
Because the refrigerant, system and air system of the cold dryer, including the electrical part, are relatively complex, and the suction dryer only has valves that need to be frequently operated and may fail, so under normal circumstances, the failure rate of the suction dryer
is lower than that of the cold dryer
In general, the suction dryer is better than the cold dryer in terms of stability and effect, but because it consumes a certain amount of regeneration gas, we generally ask customers to weigh the pros and cons before making a choice.