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Design of a drying device for wood-processing industry
Vach, Tomáš ; Hrázský, Jaroslav (referee) ; Otáhal, Jan (advisor)
The thesis considers a stabilization of temperature of a wood fiber during production of medium close fibre boards MDF in a wood-processing industry. The original purpose to solve energetic optimalization of a kiln dryer has become a serious problem. It turned out that production suffers with a big heat loss which results in big heat loss gained during a kiln drying. Primary aim of this thesis is an examination of a cooling effect of environment on chosen parts of a production line and suggestion of acceptable proceeding to minimize heat loss and to rise temperature of the wood fiber to required temperature. Solution is aimed on the section of a production line between drying equipment and press. First part of the thesis introduces technology of production of fibre boards, introduction to heat transfer problems and also basics of computer modeling of heat flow and transfer using CFD simulation. The next part includes an evaluation of the heat loss of chosen parts of the production line in a current working condition and its comparison with computer simulations. Verification of accuracy of the results while using both approaches to solution is a first step to the improvement of the current situation. It is possible to use the verified calculation model for the following solution of effects on convective and radiation heating of a wood fiber layer. An important factor in the last period of a calculation is a real temperature of the fiber board-mat at the entrance to a press. The higher entering temperature in a set temperature range is reached, the lower time needed for pressing will be and simultaneously the whole industrial process will be cut short. The solution of a problem leads to an achievement of an energy saving and should become a solid basis from which it would be possible to evaluate an improvement of production of MDF boards. The conclusion of the thesis includes an analysis of findings which refers to a heating of wood fiber and it’s effectiveness for a practical use.
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Design of a drying device for wood-processing industry
Vach, Tomáš ; Hrázský, Jaroslav (referee) ; Otáhal, Jan (advisor)
The thesis considers a stabilization of temperature of a wood fiber during production of medium close fibre boards MDF in a wood-processing industry. The original purpose to solve energetic optimalization of a kiln dryer has become a serious problem. It turned out that production suffers with a big heat loss which results in big heat loss gained during a kiln drying. Primary aim of this thesis is an examination of a cooling effect of environment on chosen parts of a production line and suggestion of acceptable proceeding to minimize heat loss and to rise temperature of the wood fiber to required temperature. Solution is aimed on the section of a production line between drying equipment and press. First part of the thesis introduces technology of production of fibre boards, introduction to heat transfer problems and also basics of computer modeling of heat flow and transfer using CFD simulation. The next part includes an evaluation of the heat loss of chosen parts of the production line in a current working condition and its comparison with computer simulations. Verification of accuracy of the results while using both approaches to solution is a first step to the improvement of the current situation. It is possible to use the verified calculation model for the following solution of effects on convective and radiation heating of a wood fiber layer. An important factor in the last period of a calculation is a real temperature of the fiber board-mat at the entrance to a press. The higher entering temperature in a set temperature range is reached, the lower time needed for pressing will be and simultaneously the whole industrial process will be cut short. The solution of a problem leads to an achievement of an energy saving and should become a solid basis from which it would be possible to evaluate an improvement of production of MDF boards. The conclusion of the thesis includes an analysis of findings which refers to a heating of wood fiber and it’s effectiveness for a practical use.
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Czechoslovak foreign trade with countries of the European Community in the period 1969 - 1989
Vach, Tomáš ; Szobi, Pavel (advisor) ; Johnson, Zdenka (referee)
This paper discusses the importance of Czechoslovak foreign trade with the EEC countries for the period of normalization. In the theoretical part, the author defines the issues of foreign trade. It deals with the variety of business concepts, tools of trade policy and the overall importance of international trade for the economy. In the analytical part describes the main organizations affecting foreign trade relations of Czechoslovakia after World War II, relations between the two organizations, bipolar division of the world and the position of Czechoslovakia in world trade. In the second part, the author analyzes the overall Czechoslovak foreign trade, territorial distribution and commodity structure of exports and imports. The last part focuses on the evaluation of the importance of trade with the EEC Member States, its development and shortcomings.
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Impact of Digitalization on Film Production
Vach, Tomáš ; JÍCHA, Marek (advisor) ; DANIELIS, Aleš (referee)
This Thesis, named "Impact of digitalization on film production" describes and asesses new technological infulences, which are changing the filmamaking process in various ways by the phenonmenon of digitalization. Specific chapters are dedicated to following topics: comparison of digital cameras from first and second generation and their specific characteristics, 3D phenomenon, transformation of recent distribution, and digitalization of archives. The conclusion is dedicated to the technological development and outlook of future. The thesis is essentially an introduction to the current view and evaluation of digitalization impact from an artists perspective as described by distributors, film makers and the end user.
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