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Predicting thermal efficiency in timber radio frequency vacuum drying
Department of Wood Science, University of British Columbia, Vancouver.ORCID iD: 0000-0002-0744-5868
Department of Wood Science, University of British Columbia, Vancouver.
Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, University of Tokyo.
2004 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 22, no 4, p. 795-807Article in journal (Refereed) Published
Abstract [en]

In this work, the efficiency of transforming dielectric energy into evaporated water is analyzed for the case of timber radio frequency vacuum drying. Based on well-known heat and mass transfer equations, a simplified mathematical model is proposed that estimates the drying efficacy in regards to the thermo-physical properties of wood. Although not exact, the theoretical results are close to the experimental observations and elucidate some phenomena like the tendency of the timber to dry from inside to outside, and the drying rate increase with the rise of the timber gas permeability. The theoretical efficiency model also predicts a range of wood permeability values for which the drying efficiency changes from 100 to 0%, thus providing a quantitative scale for classifying the spectrum of "difficult-to-dry" all the way to "easy-to-dry" wood species when using radio frequency vacuum technology

Place, publisher, year, edition, pages
2004. Vol. 22, no 4, p. 795-807
National Category
Bio Materials
Research subject
Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-6965DOI: 10.1081/DRT-120034263Local ID: 54a92887-0170-4d78-9bdd-7ef2281a2c8aOAI: oai:DiVA.org:ltu-6965DiVA: diva2:979851
Note
Upprättat; 2004; 20140508 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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