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Temperature and final moisture content distributions in vacuum driers with different fan configurations
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
1996 (English)In: Quality wood drying through process modelling and novel technologies: 5th International IUFRO wood drying conference. pp. 159-168. Quebec City, August 13-17, 1996 / [ed] A. Cloutier; Y. Fortin; R. Gosselin, Sainte-Foy, Québec: Forintek Canada , 1996Conference paper (Refereed)
Abstract [en]

In a vacuum kiln working with convective heat transfer the temperature drop across the load is high due to the low density of the superheated steam. It is crucial to maintain a high and uniform steam velocity throughout the drying load in order to achieve a controlled drying process. Later designs of vacuum kilns have focused on an ambition to load large volumes of wood into the kilns or to minimize the installed fan power. The designs have sometimes neglected the need of a controlled steam circulation with an unfavorable steam flow pattern as a result. Measurements of the temperature distributions in vacuum kilns and final moisture content distributions have shown that the fan configuration has a great influence on the kiln performance. An unfavorable steam flow pattern leads to longer drying times as well as larger final moisture spreads in comparison to a more favorable steam flow pattern. A design with fans placed above the wood stack with a well defined pressure and suction side is superior to designs with the fans placed beside the stack and working on a combined pressure and suction side.

Place, publisher, year, edition, pages
Sainte-Foy, Québec: Forintek Canada , 1996.
URN: urn:nbn:se:ltu:diva-40585Local ID: fc380e16-804f-40c3-8fc4-a2e9c8f4c23fOAI: diva2:1014107
International IUFRO Wood Drying Conference : 13/08/1996 - 17/08/1996

För godkännande; 2016; Bibliografisk uppgift: In thesis: Drying and thermal modification of wood - studies on influence of sample size, batch size, and climate on wood response; 20160524 (jacnas)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2016-10-19

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Hedlund, Björn
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