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How the dew point control system works

First, a point below the target point and close to the saturation line is identified on the h,x-diagram.

Heating is required prior to humidification. The point below the target point is then reached through maximum humidification. As this is an adiabatic method, in which the temperature drops during humidification, heating must be applied again to reach the target point.

The humidification process of dew point control is carried out in areas with very high relative humidity. And the higher the relative humidity, the more difficult it is to achieve air humidification. Furthermore, due to the need for heating before and after the humidification process, two heating coils are required in the HVAC system. As a result, dew point control proves to be less energy-efficient.

How enthalpy control works

The more energy-efficient variant of enthalpy control is therefore more suitable. With this method, the air is heated to the target air temperature plus the temperature required for the adiabatic humidification process.

Adiabatic humidification then ensures that the target point is reached precisely, with the air temperature dropping by the value calculated beforehand. As this takes place within a range of high temperatures and low relative humidity values, humidification can be achieved very simply and in an energy-efficient manner.

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