Air permeability of thermally modified hemlock wood

Liu, Yaohui (author), Avramidis, Stavros (author)

Western hemlock (Tsuga heterophylla) is a prevalent coastal species in British Columbia (BC). Its wood has a high potential for thermal modification, a process that can affect numerous physical properties, including air permeability. The current study investigates the longitudinal air permeability of hemlock wood modified at three temperature levels, 170 °C, 212 °C, and 230 °C, and a two-hour treatment length. Permeability values obtained using Darcy’s law and the water-falling volume displacement method were positively correlated with treatment temperature up to 212 °C, after which the permeability decreased slightly. ANOVA followed by the Duncan test revealed that thermal treatment at 212 °C and 230 °C significantly increased air permeability, whereas it was insignificant at 170 °C.

• Language: English
• Keywords: wood, thermal modification, western hemlock, longitudinal air permeability, specific permeability
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Publication date: 01.01.2022
• Year: 2022
• Number of pages: Str. 25-30
• Numbering: Letn. 71, št. 2
• PID: 20.500.12556/RUL-168369
• UDC: 630*812.23
• ISSN on article: 0024-1067
• DOI: 10.26614/les-wood.2022.v71n02a01
• COBISS.SI-ID: 137779459
• Publication date in RUL: 10.04.2025

Record is a part of a journal

• Title: Les
• Shortened title: Les
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze
• ISSN: 0024-1067
• COBISS.SI-ID: 13940224

Licences

• License: CC BY-NC 4.0, Creative Commons Attribution-NonCommercial 4.0 International
• Link: http://creativecommons.org/licenses/by-nc/4.0/
• Description: A creative commons license that bans commercial use, but the users don’t have to license their derivative works on the same terms.

Secondary language

• Language: Slovenian
• Title: Plinska permeabilnost termično modificiranega lesa zahodne čuge

Abstract

Zahodna čuga (Tsuga heterophylla) je prevladujoča obalna vrsta v Britanski Kolumbiji (BC) z velikim potencialom za termično modifikacijo lesa, ki lahko vpliva na številne fizikalne lastnosti, vključno s plinsko permeabilnostjo. Ta študija preučuje vzdolžno plinsko permeabilnost lesa čuge, termično modificiranega pri treh temperaturah, 170 °C, 212 °C in 230 °C, ter 2-urni obdelavi. Vrednosti plinske permeabilnosti, določene iz Darcyjevega zakona z metodo izpodrivanja prostornine vode, so bile pozitivno povezane s temperaturo obdelave do 212 °C, nato pa se je permeabilnost nekoliko zmanjšala. Analiza variance (ANOVA) skupaj z Duncanovim testom mnogoterih primerjav sta pokazala, da je termična obdelava pri 212 °C in 230 °C znatno povečala plinsko permeabilnost, medtem ko so bile spremembe pri 170 °C neznačilne.

• Keywords: termična modifikacija, zahodna čuga, Tsuga heterophylla, vzdolžna plinska permeabilnost, specifična permeabilnost, vpliv temperature