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 />
����������� � �� ����<br />
Radio Frequency / Vacuum Dry<strong>in</strong>g<br />
Radio Frequency-Vacuum dry kiln (RF/V-dry<strong>in</strong>g)<br />
Advantages<br />
• Very short dry<strong>in</strong>g time<br />
• Wide thickness range <strong>of</strong><br />
timber to be dried<br />
• Very good dry<strong>in</strong>g quality<br />
• Stack<strong>in</strong>g without stickers<br />
Up to now only one successful<br />
kiln manufacturer on the<br />
American market :<br />
→ HeatWave Technologies /<br />
CAN<br />
Disadvantages<br />
• Limited to highly permeable<br />
species<br />
• High <strong>in</strong>vestment costs<br />
• High energy costs (electricity!)<br />
• Low efficiency <strong>of</strong> RF-generator<br />
(η = 0,55..0,65)<br />
• Limited life time RF-tube<br />
(approx. 4000 - 8000 h)
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