Effects of heat treatment on thermal properties of European beech wood

Abstract

Beech wood, due to its properties, is one of the most versatile and successfully used construction materials. The wood properties could even be improved, and among different wood modification processes, the thermal modification approach is usually considered as an environment-friendly technology based only on the heat and water application during wood treatment. Changes in material properties resulting from the thermal treatment of wood increase applicability of this material, but on the other hand, detailed knowledge of the modified properties is definitely necessary for the proper application of such materials to construction engineering. Unfortunately, credible data on thermal characteristics of thermally modified wood are usually provided in a very limited way, and there is no information on specific heat in particular. An original calorimetric method was used to determine the specific heat of untreated and thermally modified European beech wood (Fagus sylvatica L.). The inverse modeling was implemented to estimate the anisotropic thermal conductivity, and significant differences were found for the radial and tangential directions. The thermal modification highly influenced the increase in the thermal conductivity in the longitudinal direction. The validation procedure showed credibility of the applied methods, and it is clear that modeling of heat transfer in thermally modified wood leads to erroneous results when using thermal properties determined merely for untreated wood.

Solid wood impregnated with a bio-based phase change material for low temperature energy storage in building application

“…7. The thermal conductivity of pine and beech were 0.12 and 0.23 W m −1 K −1 , 1 respectively, which were in line with the reported values in the literature [38,39]. Previous studies [38] discussed that thermal conductivity of wood materials varies with density, moisture content and wood species.…”

“…The thermal conductivity of pine was reported to be in the range 0.1-0.14 W m −1 K −1 , depending on the species. Czajkowski et al [39] studied thermal conductivity of beech and reported a value of 0.24 W m −1 K −1 along the radial direction, while other study [38] reported a value of 0.19 W m −1 K −1 . These studies corroborate the funding of the present study.…”

Effect of thermal treatment on the physical properties of GG100 clone Eucalyptus wood

“…When studying the influence of thermal treatments on the wood of different clones of Eucalyptus urophylla x Eucalyptus grandis, JUIZO et al [31] obtained ML varying from 17 to 22% employing a temperature of 200 °C for 4 h in a laboratory kiln. According to CZAJKOWSKI et al [32], ML is due to the thermal degradation of cellulose, hemicelluloses and lignin, as well as the volatilization of some extractives.…”

Emprenye ve Isıl İşlemin Ahşap Malzemenin Bazı Fiziksel ve Mekanik Özelliklerine Etkileri

“…Another wood modification method that gaining in popularity over the last decades is heat treatment. Heat treatment is an environmentally friendly method applied without using any chemicals to improve the properties of wood material [5,15]. When wood is heated, generally chemical changes start to take place inside the wood structure depending on some conditions (treatment temperature, treatment time, atmosphere, etc.…”