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High temperature drying of sawn timber—A review
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-2839-9055
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0001-9196-0370
Department of Ocean Operations and Civil Engineering, Faculty of Engineering, Norwegian University of Science and Technology, Trondheim, Norway.ORCID iD: 0000-0002-5869-2236
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-4526-9391
2024 (English)In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 42, no 9, p. 1397-1414Article, review/survey (Refereed) Published
Abstract [en]

Sawn-timber drying is the wood industry’s most time- and energy-consuming process. This process can be more efficient than the conventional method by elevating the dry-bulb temperature to above 100 °C in a high-temperature drying (HTD) process, which for some species shortens the drying process by up to 50% without deteriorating the quality. Comprehending the complex correlation between the wood drying physics at high temperatures and the anatomical features of the specific species, along with its mechanical and physical properties, is crucial, as it limited its application from being broadly implemented in industry and the necessity of generalizing this method for wood species. The present study has been conducted to comprehensively review and tackle the challenges of applying this method on various species and the consequences, such as high moisture content gradients resulting in stress residual, unevenness, and color changes. Energy, environment, and economic (3E) assessments of HTD were evaluated. The accelerated drying process in HTD reduces heat losses and air leaks, resulting in higher energy efficiency than the conventional methods. Furthermore, it was proved to be 20% economically in the long term. Confliction in reported studies, such as HTD's effect on permeability and volatile organic compound (VOC) emissions, was raised, highlighting the importance of further studies for generalizing this method to adapt appropriate drying schedules, focusing on Scandinavian species by referring to previous industrial trials.

Place, publisher, year, edition, pages
Taylor & Francis, 2024. Vol. 42, no 9, p. 1397-1414
Keywords [en]
Efficiency, energy, sawn timber, sustainability, VOC, wood
National Category
Bio Materials
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-107787DOI: 10.1080/07373937.2024.2365858ISI: 001252824100001Scopus ID: 2-s2.0-85196670729OAI: oai:DiVA.org:ltu-107787DiVA, id: diva2:1875902
Note

Validerad;2024;Nivå 2;2024-08-16 (signyg);

Full text: CC BY-NC-ND License

Available from: 2024-06-24 Created: 2024-06-24 Last updated: 2024-08-16Bibliographically approved

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Hajiyan, EbrahimHuber, Johannes Albert JosefHansson, LarsSandberg, Dick

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