Measurements of Thermal and Dielectric Properties of Medium Density Fiberboard with Different Moisture Contents

Zhou, Haibin; Hu, Chuanshuang; Hu, Shuofei

doi:10.15376/biores.8.3.4185-4192

Cited by 19 publications

(12 citation statements)

References 11 publications

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“…However, the effect of moisture content within the wood on its thermal conductivity could be more prominent than porosity. As reported by Zhou et al (2013), the con-ductivity increased almost linearly with moisture content at a given temperature, which is explained by the conduction properties of the water.…”

Section: Thermal and Physical Propertiessupporting

confidence: 72%

Thermo-modified native black poplar (Populus nigra L.) wood as an insulation material

Todaro¹,

Liuzzi²,

Pantaleo³

et al. 2021

iForest

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Extensive research projects have been carried out on thermal modification of wood material, yet thermal properties of thermally modified poplar wood have not been comprehensively investigated. Black poplar (Populus nigra L.) is a Eurasian species native to Italy which is rarely used for the production of highperformance products, though it is one of the least expensive hardwoods on the market. To explore alternative applications of poplar wood such as building facade or fire resistance materials, reliable data of thermal behaviour of thermally modified wood at high temperatures are needed. In this work, the thermal behaviour of native black poplar wood after thermal modification at different temperatures (180 °C, 200 °C and 220 °C) was analyzed. Thermal conductivity, thermal diffusivity and porosity were measured on poplar wood boards, as well as mass loss and wood color changes after heat treatment were quantified. Thermal conductivity of wood samples showed significant changes after treatment at 200 and 220 °C, but not at 180 °C. Wood porosity showed significant differences with the control when the samples were modified at a temperature of 220 °C. Increasing color differences were observed in wood samples by increasing the thermal modification temperature. Also, the mass loss of wood samples increased and equilibrium moisture content significantly dropped down after thermal modification. Our results showed that the use of thermally-modified black poplar wood could be considered as a viable alternative to chemically treated wood products for specific applications where high insulation is needed, such as saunas or windows, and for façades elements.

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Section: Thermal and Physical Propertiessupporting

confidence: 72%

Thermo-modified native black poplar (Populus nigra L.) wood as an insulation material

Todaro¹,

Liuzzi²,

Pantaleo³

et al. 2021

iForest

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“…The two properties are, however, determined with different experimental methods. The specific heat is traditionally measured with calorimetric methods (e.g., Baryeh 1997), while the thermal conductivity values are obtained by the application of various methods based on principles of steady-state or transient heat transfer (e.g., Sonderegger and Niemz 2009;Zhou et al 2013). In the last decades, the development of the calorimetric methods resulted in constructing automated systems for thermodynamic analysis of materials based on the technique of differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of wood-based panels: specific heat determination

et al. 2016

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Ensuring reliability of data on thermal properties of wood-based panels is important for manufacturing processes, especially when it is recommended to shorten the cooling phase and stack the panels in hot conditions. Prediction of the heat transfer during cooling phase and normal or hot stacking based on accurate data is essentially important for attaining panels of required properties. The thermal properties are also required when designing houses, especially low-energy or passive ones. Therefore, a water calorimeter was adequately designed and constructed to ensure improvement in the accuracy of the specific heat measurements. The calorimeter was used to determine the specific heat. The attained accuracy estimated by the relative error was significantly increased, and the error values were less than 2 % for all types of the investigated particleboard and OSB. In case of low-density fiberboard (LDF), the maximum value of the relative error did not exceed 4 %. It was also shown that high accuracy required for the specific heat measurements was achieved for experiments in which high-mass samples were used, in contrast to measurements for such samples in traditional DSC systems. The results for the specific heat were within the range from 1420 to 1450 J/kg K for LDF and all types of particleboard. The effect of the investigated material density on the specific heat was not found. The only exception was in case of OSB for which the specific heat was ca. 1550 J/kg K, and it was approximately 100 J/kg K higher when compared to other panels.

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“…Recently, Zhou et al (2013) applied the light flesh method to measure thermal diffusivity of commercial MDF for three levels of moisture content and six different values of temperature. The obtained results were used to calculate thermal conductivity values.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties of wood-based panels: thermal conductivity identification with inverse modeling

et al. 2016

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Accuracy and effectiveness of predicting the heat transfer in wood-based panels is increasingly important for describing their behavior, especially for varying environmental conditions. To model the heat transfer in wood-based panels it is essential to input credible data on their thermal properties. Therefore, proper estimation of the specific heat and thermal conductivity is fundamental. A finite element inverse analysis procedure was developed. The procedure was designed in such a way that anisotropy of the thermal conductivity was accounted for. For all analyzed wood-based panels, in-plane thermal conductivity was significantly higher compared to the transverse one, and it was recommended to consider the anisotropy, and to use both in-plane and transverse thermal conductivity for modeling heat transfer. The effect of temperature on thermal conductivity was not clearly manifested. The thermal conductivity values were decreasing or increasing with temperature. In some cases this influence was practically insignificant (i.e. OSB), while for low density fiberboard the effect of temperature on thermal conductivity was the highest. The identification procedure was validated and its credibility was assessed. It was shown that data on thermal properties available in the literature should not be recommended to model the heat transfer.

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Measurements of Thermal and Dielectric Properties of Medium Density Fiberboard with Different Moisture Contents

Cited by 19 publications

References 11 publications

Thermo-modified native black poplar (Populus nigra L.) wood as an insulation material

Thermo-modified native black poplar (Populus nigra L.) wood as an insulation material

Thermal properties of wood-based panels: specific heat determination

Thermal properties of wood-based panels: thermal conductivity identification with inverse modeling

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