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Dehumidification method

  Refrigeration cycle dehumidification method chemical absorption Dehumidification method
The course of dehumidification Dew point control method
Theory When temperature is below the dew point temperature of the humid air passed the surface temperature of the cooing coil, condensation occurs at the surface of the coil and water is collected as drain water. As a result there is fall in absolute humidity of air after passage.

 When temperature of the refrigeration falls below 0°C, the dew condensed water over the coil starts to freeze up and soon ice is formed. To avoid this phenomenon, the coil surface temperature (or the coolant temperature) is detected and feedback control is incorporated to avoid temperature falling below 0°C.

Chemical absorbent material is disc like shape is continuously rotated. On one hand the absorbed air is instantly dehumidified and on the other the warm air from heater is recycled resulting in continuous dehumidification.


Relative humidity of reachable dew point /25°C
11~12°C/45%RH 2~4°C/23% -100°C
Merits Special structure not necessary as dependent on cooling capacity. From energy conservation point of view a lower dew point temperature is achieved due to simple structure. Normal temperature dehumidification is possible due to a standalone unit.
Demerits As low relative humidity cannot be achieved. There is variation in the cooling capacity leading to unstable temperatures. A separated cooler is required due to heating of the humidified air resulting in poor efficiency.
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Dehumidification possible region for each method based on Psychometric diagram
 

Dehumidification possible region for each method based on Psychometric diagram

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