National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Numerické simulace teplotního a vlhkostního pole ve dřevě v prostředí se zvýšenou teplotou
Kubelková, Květa
The thesis deals with numerical simulation of temperature field with internal heat sources and experimental verification of this model in an environment where the high temperatures are applied (during thermal modification of wood). The work was further extended by analysis of coupled heat and monture transfer in the wood. Designed mathematical models are solved numerically using software COMSOL Multiphysics based on the finite element analysis (FEM). The chemical reactions occur due to decomposition of woodconstituents (cellulose, hemicelluloses and lignin) are taken into account in present study. These reactions are usually not solid in known models. The results of numerical simulations of temperature field, including pyrolysis model, are compared with experimental measurements for verification of the proposed model. Contribution of this thesis is the possible application of the proposed model for the design and optimization of thermal modification Schedule with respekt to wood species and sample dimensions.
Zkoumání vybraných vlastností neupraveného a tepelně upraveného smrkového a modřínového dřeva z pohledu vhodnosti na výrobu šindele
Hlobil, Vladimír
The aim of this thesis is the analysis and comparison of selected material properties of spruce, larch, heat-treated spruce and larch in terms of suitability for the production of wood roof shingles. Monitoring and comparing characteristics are durability of the wood material against the brown rot fungus, compressive strength across the fiber, bending strength and modulus of elasticity. Tested material and its selected properties are compared as for use in the manufacture and installation of wooden shingles.

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