The water vapour transfer zone (12) is maintained substantially free of any gas other than water vapour.
According to the invention, the film is treated with vapour, preferably water vapour, whereby softened water in particular is used to form said water vapour.
For examples such levels can comprise at least 60% water vapor, at least 70% water vapor, at least 80% water vapor or at least 90% water vapor for causing an intended effect in tissue.
Water vapor recovered in the solvent extraction process may be used as a water vapor feed to the heated water vapor recycling system.
The water vapor supply unit (17) is capable of supplying water vapor to the first room (13).
Water vapor is removed using a water separator.
Also the volume of the water vapor and the difference in density of water vapor are maximized.
As the vapor, use is made of saturated steam or overheated steam and overheated steam is preferred.
The atmosphere in which the treatment is performed includes an air/steam or oxygen/steam mixture with a steam volume fraction of at least 40 %.
The regenerative blower (106) compresses steam, and the compressed steam flows to the evaporative condenser (104) where compressed steam is transformed into product fluid.
A steam supply device produces steam.
The fuel assembly comprises a steam channel through which the steam flows through the fuel assembly.
The water-vapor-permeable membrane combines high water-vapor permeability with low air leakage.