WOOD RESEARCH Volume 69, Number 1, 2024
YEFRI CHAN, DWI ARIES HIMAWANTO, BUDI KRISTIAWAN, and INDRI YANINGSIH

SHORT NOTE. THERMAL CHARACTERISTICS OF SENGON WOOD DRYING USING INFRARED AND COMBINED INFRARED-HOT AIR METHODS

This research aimed to determine the thermal characteristics of sengon wood due to drying at temperature of 70, 80, and 90oC with air velocity of 1 and 3 m/s using infrared (IR) and combined infrared-hot air (IR-HA) method. The thermal characteristics analyzed included temperature distribution, reduction in moisture content, and drying rate. The results of drying wood samples using IR method showed that the fastest drying time was obtained at 90oC with air velocity of 1 m/s. However, for combined IR-HA method, the optimal condition was achieved at air velocity of 3 m/s. The largest drying rate attained using combined IR-HA method was 0.27 g/min, while the smallest was recorded at 0.094 g/min with IR method. These results showed that combined IR-HA method produced a more evenly distributed temperature and faster drying time compared to the IR method

WOOD RESEARCH Volume 61, Number 3, 2016
Tomasz Rydzkowski and Iwona Michalska-Pożoga

Analysis of intensity of changes in the moisture content of wood chips in the production of wood polymer composites during drying and storage processes

The article presents the results of research on changes in humidity of wood chips intended for the of wood-polymer composites (WPC) manufacture. In the studies were used wood chips of various origin (coniferous and deciduous wood) and the various forms (from dust-meal, through small chips on big chips). Measured moisture content of chips during drying in the dryer and after that, during the natural return to hygroscopic equilibrium with the atmosphere of the storage space. After drying, the samples were stored in open and closed containers.

WOOD RESEARCH Volume 63, Number 2, 2018
Horák Jiří, Kuboňová Lenka, Tomšejová Šárka, Laciok Vendula, Krpec Kamil, Hopan František, Kubesa Petr, Kysučan Zdeněk, and Ochodek Tadeáš

Change in the wood moisture dependency on time and drying conditions for heating by wood combustion

The aim of this study was to determine the drying time of firewood under the climatic conditions of the Czech Republic to decrease the moisture content to an acceptable level for combustion (under 20%). The effects of log size, outdoor/indoor trying and wood species were evaluated.

WOOD RESEARCH Volume 64, Number 3, 2019
Annamarie Velic, Maroš Soldán, Aleš Ház, Igor Šurina, and Michal Jablonský

Determination of volatile organic compounds’ emissions from wood processing

Volatile organic compounds (VOCs) have received a great deal of attention due to their high abundance during the drying process of wood particles. This is a potential environmental issue due to being low level ozone precursors. This work aimed to study the emissions of VOCs during drying in the particleboard manufacturing process. In this study, wood particles were dry and VOCs were collected using a sorption tube. The VOCs were analyzed with gas chromatographymass spectrometry to explore the effect of temperature on the composition of main components. The results indicated that α-pinene and D-limonene were the dominant components. The results also indicated that using natural gas or wood dust as a heat source did not have a major impact on the emission characteristics of VOCs.

WOOD RESEARCH Volume 64, Number 1, 2019
Burak Turkan and Akin Burak Etemoglu

Numerical investigation of wood drying

In this study, forced convective drying process of wood material with rectangular shape was investigated. Firstly, governing equations for the flow field were solved by using ANSYS Fluent. Then average heat transfer coefficient on the surface was calculated by using Standard k-ɛ Turbulence Model. It was found that mass transfer coefficient making use of the relationship between heat and mass transfer. Simultaneous heat and mass transfer equations were solved transiently with Comsol Multiphysics using surface boundary conditions for selected air velocity, air temperature and material thickness. In drying process the moisture and temperature distributions inside the solid were obtained transiently. The mathematical model for equations was formed using Fourier heat and Fick diffusion models. Results acquired from the present model were compared with a study results which are available in literature and it was shown a very good agreement.