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Heating and Cooling in the Same Direction

There are two main processes when a heated dryer desorbs moisture for regeneration:

(1) Heating Process
(2) Cooling Process

Primarily to desorb the moisture adsorbed by the adsorbent, allowing the adsorbent to become dry again and be reused.

If the heated and moisture-desorbed desiccant is in a high-temperature state, water and the adsorbent cannot form a "van der Waals force" bond, meaning water cannot be adsorbed by the adsorbent. The adsorbent must be cooled through a cooling process until it is below the temperature at which a "van der Waals force" bond can occur (below 65℃). The lower the temperature after cooling, the better the adsorption effect.
As long as the heating time is sufficient, the heating temperature is high enough, and the heating device design has a safety margin of 20% or more, the adsorbent can be completely desorbed.
The heating process is relatively not a technical focus.
In contrast, during the cooling process, the outlet quality is often affected by moisture contamination of the adsorbent, which is particularly severe in circulating cooling designs.
To avoid moisture contaminating the adsorbent during the cooling process, circulating cooling designs typically reverse the direction of the heating and cooling processes to prevent moisture from adhering and contaminating the downstream end of the adsorbent. Furthermore, to reduce the degree of moisture contamination, the cooling stop temperature is usually set above 70℃, which is much higher than the adsorption temperature. Therefore, temperature shock often occurs when the adsorption towers switch, leading to moisture breakthrough and causing dew point spikes.