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Climate control in vacuum dryers for convective heat transfer

Part 2: Actual climates in industrial kilns and suggestions to improve kiln design

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Abstract

The first part of this contribution determined the demands on climate control in vacuum drying kilns that are necessary to achieve the final moisture content variation stipulated in the European Drying Group (EDG) proposal on wood drying quality standards. In this second part of the contribution, these demands are compared with measurements of actual climates and the resulting final moisture content in vacuum kilns during industrial production. The measurements show that none of the studied industrial vacuum kilns are capable of controlling climate with acceptable accuracy. The variations in drying climate lead to large variations in final moisture content and reduced production capacities. Drying quality and drying capacity would be greatly increased with improved kiln design and improved climate control systems. Critical factors in kiln design and climate control system design necessary to maintain a controlled drying climate are listed.

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References

  • Behnke C, Kovácik I, Militzer KE (1995) Monitoring the drying process in vacuum kiln. Proceedings, Vacuum drying of wood, High Tatras, Slovak Republic, 8–12 October 1996

  • Hedlund B (1996) Temperature and final MC distributions in vacuum dryers with different fan configurations. Proceedings, 5th International IUFRO Wood drying conference, Québec City, Canada, 13–17 August 1996

  • BA Källander (2002) Climate control in vacuum dryers for convective heat transfer. Part 1: Demands on climate control. Wood Sci Technol 36(6):477–486

  • Ledig SF, Militzer KE (1999) Measured gas velocity and moisture content distribution in a convective vacuum kiln. Proceedings, 6th International IUFRO Wood drying conference. Stellenbosch University, Matieland, South Africa, 25–28 January 1999

  • Longauer J, Trebula P (1995) Influence of circulation intensity on homogenity of wood drying monitored at outlet of stack. Proceedings, Vacuum drying of wood, High Tatras, Slovak Republic, 8–12 October 1996

  • Ressel JB (1993) Zum aktuellen Stand der Vakuumtrocknung von Schnittholz. Part 2: Beschreibung der auf der Messe vorgestellten Anlagen. Holz Zentralblatt 79:1313–1315

  • Vanicek T, Bittner T (1992) Technology of vacuum kilns. Proceedings, 3rd IUFRO International Wood Drying Conference, Vienna, Austria, 18–21 August 1992

  • Weber M (1991) Untersuchungen über das Verfahren der Unterdrucktrocknung nach Moldrup. Diplomarbeit, Fachhochschule Rosenheim. Rosenheim, Germany

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Author notes

  1. Björn A. Källander

    Present address: SP Swedish National Testing and Research Institute, Box 857, 501 15 , Borås, Sweden

Authors and Affiliations

  1. Stora Corporate Research AB, 791 80 , Falun, Sweden

    Björn A. Källander

  2. Building Material, Royal Institute of Technology, 100 44 , Stockholm, Sweden

    Björn A. Källander

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  1. Björn A. Källander
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Correspondence to Björn A. Källander.

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Källander, B.A. Climate control in vacuum dryers for convective heat transfer. Wood Sci Technol 37, 3–9 (2003). https://doi.org/10.1007/s00226-002-0159-z

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  • DOI: https://doi.org/10.1007/s00226-002-0159-z

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