Modelling and visualization of defrosting processes of timber in its thermal treatment technologies

The goal of this project, solved by employees of Faculty of Wood Sciences and Technologies at Technical University in Zvolen and University of Forestry in Sofia is the modelling of heating process of frozen wood and thawing of ice located in lumens and cell walls in the temperature interval of - 40 0C to -10C. The result of this modelling is the determination of specific heat consumption based on the wood species and calculation of the thawing time depending on external conditions of thermal treatment. Through computer simulation, processes of temperature increase and ice thawing along the cross section of orthogonal and cylindrical assortments are visualized.