Developments in vacuum drying and press drying of
Developments in vacuum drying and press drying of
Developments in vacuum drying and press drying of
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Center for<br />
Forest Products<br />
Pr<strong>of</strong>. Dr. Ressel<br />
Introduction<br />
Fundamentals<br />
Plant Facilities<br />
Innovations<br />
Process<br />
Technology<br />
Plant Examples<br />
Brunner<br />
IWT<br />
Mühlböck<br />
Kronseder<br />
Eberl<br />
Opel<br />
HeatWave<br />
Press Dry<strong>in</strong>g<br />
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Fundamentals <strong>of</strong> Timber Dry<strong>in</strong>g<br />
Heat transfer to wood f<strong>in</strong>ally leads to mass transfer (water vapour<br />
transition from the wood surface to the surrond<strong>in</strong>g atmosphere)<br />
With<strong>in</strong> wood heat conduction <strong>in</strong>itiates water <strong>and</strong> / or vapour<br />
movement, removal <strong>of</strong> bound water <strong>and</strong> evaporation <strong>of</strong> water<br />
Heat<br />
transfer<br />
Heat conduction<br />
...<strong>in</strong>side the wood<br />
Mass<br />
transfer<br />
Water /<br />
vapour<br />
movement<br />
Coupled processes<br />
• Interfer<strong>in</strong>g each<br />
other, partially<br />
with oppos<strong>in</strong>g<br />
effects<br />
• None may be considered<br />
alone
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