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What Is The Difference Between A Refrigerated Air Dryer And An Adsorption Air Dryer?
Jul 27, 2018

In modern enterprises, the use of compressed air is becoming more and more common. Common compressed air dryers mainly include adsorption air dryers and refrigerating air dryers. What is the difference between a refrigerated dryer and an adsorption dryer?


1 different working principle

The refrigerating air dryer is based on the principle of freezing and dehumidification, and the saturated compressed air from the upstream is cooled to a certain dew point temperature by heat exchange with the refrigerant, and a large amount of liquid water is condensed, and is automatically discharged out of the machine after being separated by the gas-liquid separator. Thereby achieving the purpose of drying water. The adsorption air dryer is based on the principle of pressure swing adsorption, and the saturated compressed air from the upstream is contacted with the desiccant under a certain pressure, and most of the water is adsorbed in the desiccant, and the dry air enters the downstream. Work to achieve deep drying purposes.


2 different water removal effects

Because of the principle of the refrigerating air dryer, if the temperature is too low, there will be ice formation, so the dew point temperature is usually 2~10 °C. The adsorption air dryer does not have to pass the temperature change, and the desiccant (alumina) can be further dried. Therefore, the dew point of the outlet can usually reach below -20 ° C, which means deep drying can be achieved.


3 difference in energy loss

For the refrigerating air dryer, since the cooling is performed by the refrigerant compression, the power supply power is high. The adsorption air dryer has only a few tens of watts of electric power because it only needs to control the valve through the electric control box, which means that there is no power loss.


4 difference in gas loss

Because the refrigerating air dryer achieves the purpose of removing water by changing the temperature, the water is discharged out of the machine through the automatic drainer, so there is no loss of gas volume. The adsorption air dryer needs regeneration of about 12-15% because the desiccant needs to be regenerated after the water absorption is saturated.


5 different failure rates

Because the refrigerant system and the air system of the refrigerating air dryer include relatively complicated electrical parts, and the adsorption air dryer has only the valve having a malfunction due to frequent movements, the failure rate of the adsorption air dryer under normal conditions is normal. It is lower than the refrigerated air dryer.


In general, the adsorption air dryer is superior to the refrigerating air dryer in terms of stability and effect. It is only because we need to lose a certain amount of regeneration gas. However, more and more manufacturers have chosen adsorption air dryers, which should be said to be a trend.


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