What is the difference between a cold dryer and a vacuum dryer

Cold dryer is a method of dehumidifying by freezing, allowing water in compressed gas to condense into a liquid state and then discharge cooling water through a separator.

The suction dryer is based on the principle of pressure swing adsorption, which contacts the moisture in compressed gas with the desiccant through a certain pressure, causing most of the moisture to be adsorbed into the desiccant, achieving the purpose of water gas separation.

The cold dryer condenses water into liquid through cooling and then discharges it through an automatic drain. The loss of air volume during operation is negligible. The desiccant inside the suction dryer needs to be regenerated when it absorbs water to saturation, and there will be a certain loss of regeneration gas during the process.

Differences in water removal effects

The cold drying machine adopts a cooling principle. If the temperature is too low, internal icing may occur, causing ice blockage and affecting gas flow. Therefore, in general, the design dew point of the cold drying machine is between 2 and 10 ℃. The suction dryer uses a dryer that can perform deeper drying, with a designed dew point temperature below -20 ℃. So in terms of water removal effect, the suction dryer is better than the cold dryer.

Differences in energy consumption

The cold drying machine mainly achieves the purpose of removing water by cooling the refrigerant, with higher energy consumption. The vacuum dryer, on the other hand, uses a program inside the electric control box to control the valve, resulting in lower power consumption.