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 />
Steamcondenser<br />
Vacuum<br />
-pump<br />
“Hot” electrode<br />
“Cold” electrode<br />
Scheme <strong>of</strong> a RF/V-dry kiln (Wolf)<br />
• Dielectric Heat<strong>in</strong>g <strong>of</strong> wet wood <strong>in</strong><br />
a dielectric field<br />
• Wet Wood as dielectric material<br />
• Power absorption <strong>of</strong> the material<br />
Radi<strong>of</strong>requencygenerator<br />
Ground<br />
Cold electrode<br />
Hot electrode<br />
Cold electrode<br />
P = 0,556 � f � E 2 � ε´´ � 10 -12 [W/cm³]<br />
P [W/cm³] Power per unit volume<br />
f [Hz] Frequency<br />
E [V/cm] Field strength<br />
ε” [-] Loss factor <strong>of</strong> wood
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