Two control parameters for the outlet moisture content
were tested: (1) the pressure drop over the drying chamber,
and (2) the outlet temperature of the drying gas. It should be
favourable to use the pressure drop over the drying chamber,
as the outlet drying gas can be reduced to levels close to
condensation. Accordingly, the full temperature difference
between the boiler and heat demand can be utilised. Our tests,
however, showed that this method was unreliable.