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Calculation of the heat energy needed for melting of the ice in wood materials for veneer production
Názov Calculation of the heat energy needed for melting of the ice in wood materials for veneer production Aut.údaje Nenčo S. Delijski, Ladislav Dzurenda, Veselin Brezin Preklad názvu podnázvu : Výpočet spotreby tepla na rozmrazovanie ľadu v drevených materiáloch pre výrobu dyhy Autor Delijski Nenčo S. Spoluautori Dzurenda Ladislav TUZDFOD - Katedra obrábania dreva Brezin Veselin Zdroj.dok. Acta facultatis xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Roč. 55, č. 2 (2013), s. 21-32 Poznámky Lit. Jazyk dok. angličtina Krajina Slovenská republika Systematika 630*81 674 Heslá zamrznuté drevo - frozen wood * rozmrazovanie dreva - wood defrosting * ľad - ice * merná tepelná spotreba energie - specific heat energy consumption * merná tepelná kapacita - specific heat capacity * konvenčná hustota - basic density * bod nasýtenia vlákien - fiber saturation point Anotácia An approach for the calculation of the specific heat energy, qice, needed for melting of the ice in the wood has been suggested. The approach takes into account to a maximum degree the physics of the processes of thawing of the ice, formed by both the bounded and the free water in the wood. It reflects the influence of the temperature, wood moisture content, wood density, and for the first time also of the influence of the fiber saturation point of each wood specie on qice during wood defrosting and the influence of the temperature on the fiber saturation point of frozen and non-frozen wood. An equation for the easy determination of the specific heat energy, qfw, needed for the melting of the ice, which is formed by the free water in the wood has been derived, depending on the basic density of the wood rb, the wood moisture content u, and the fiber saturation point ufsp. An equation for the determination at u≥ ufsp of the specific heat energy qbw, needed for the melting of the ice, which is formed by the bounded water in the wood has been derived as well, depending on rb, u, ufsp, and the initial temperature of the frozen wood tw0. The specific heat energy qice equals to qfw + qbw. For the calculation of the qfw and qbw according to a suggested approach and according to the mathematical description of qfw and qbw a software program has been prepared in MS Excel 2010. With the help of the program calculations have been carried out for the determination of qfw and qbw for oak, beech, pine and poplar frozen wood with moisture content ufsp ≤ u ≤ 1.0 kg·kg−1 at a temperature range for tw0 from – 20 °C to – 1 °C. Báza dát xcla - ČLÁNKY Druh dok. RBX - rozpis článkov z periodík Odkazy PERIODIKÁ-Súborný záznam periodika Zväzky 2013: 1-2 
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Počet záznamov: 1