This document discusses three main methods for controlling humidity: heating, cooling/condensation, and desiccant dehumidification. Heating reduces relative humidity by increasing the dry bulb temperature while keeping moisture content constant. Cooling below the dew point condenses water out of the air, reducing moisture content and allowing re-heating to lower relative humidity. Desiccant dehumidification directly adsorbs water vapor from the air, simultaneously lowering both moisture content and relative humidity, making it effective for applications requiring very low humidity levels such as industrial processes.

1. Humidity Control Methods
Desiccant
Dehumidification
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2. Hea9ng
• Hea$ng Would Increase Dry Bulb Temperature (DB).
• It would also increase the Air volume.
• However, Moisture Content (g/kg) remains the same.
• The result is %RH reduced.
• Example: Increasing space temperature from 22℃/ 60% RH
(9.94 g/kg) to 30℃ will drop down RH value to 37.4% keeping
the same moisture content (9.94 g/kg).
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This method can be used where temperature control is not required since
increasing of ᵒC DB to an acceptable limit would reduce the %RH in the space
with the same moisture content unchanged.

3. Cooling (Condensa9on)
• Cooling Would Decrease Dry Bulb Temperature (DB).
• It would also decrease the Air volume.
• Cooling below the dew point condenses water and accordingly
moisture content (g/kg) is reduced (Dehumidifica$on), however
at Dew pint the RH value would be 100% (Saturated air).
• Therefore, re-hea$ng air would reduce its %RH value.
This method can be used for commercial
applica$ons and swimming pools, where
the needed moisture content g/kg can be
achieved by commercial cooling and
condensa$on (Down to 8.8 g/kg)
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4. Desiccant Dehumidifica9on
• Desiccant Dehumidifica$on is simply to adsorb water vapor
from the air (Moisture content).
• Adsorp$on would reduce %RH value, and moisture content
(g/kg) reduced simultaneously.
• Very efficient method and ideal to use beyond limits of
commercial cooling/ dehumidifica$on (i.e. <8.8 g/kg)
Mainly used on Industrial Applications, i.e.
Pharmaceutical, Food Manufacturing, Glass
Lamination, Storage, Achieves, Military applications,
Turbine & Power Generators Preservation (Corrosion
Control), Cold Stores, Server & Control Rooms, etc..
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