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Solar system
Tuhovčák, Ján ; Fortelný, Zdeněk (referee) ; Chroboczek, Libor (advisor)
The bachelor thesis describes the issue of the domestic water heating by solar systems and the conditions of this system’s usage, its advantages and disadvantages are mentioned. Part of this paper analyzes the main components of solar system and there is a list of solar panels available on the market. The second part of this thesis deals with specific application of a solar system in the locality of Brno. The concept of the system consists of absorption area calculation, energy balance and the system’s financial analysis. Financial repayment time is interpreted separately for the conditions in Czech Republic and Slovakia. If the government grant is considered in the calculation, the financial repayment time is economically interesting, otherwise it is disputable. The environmental contribution is in every case unambiguous.
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Solution of inverse problems in the area of material and heat exchangers
Kůdelová, Tereza ; Nechvátal, Luděk (referee) ; Čermák, Jan (advisor)
This bachelor's thesis deals with the dynamic behavior of heat exchangers which is described by the system of dierential equations. In this conection it includes a general information about necessary theoretical background especialy concerning heat transfer. Further, it mentions also the basic types of arrangement of heat exchangers that may occur in practice. The main goal is to answer the questions of controllability, observability and identifiability of the parameters obtained by solving corresponding inverse problem.
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Selection of suitable fluid flow directions in laminar flow tubular cooler
Krobot, David ; Kohoutek, Josef (referee) ; Jegla, Zdeněk (advisor)
This master’s thesis is devoted to problematic of selection of suitable flow directions in double pipe heat exchanger. First chapter is oriented to the construction of tube heat exchangers. It is also discussed impact of construction solution to the flow character and changing of his process parameters. The difference between parallel and countercurrent flow is also occurred in this parts. The next chapter is focused to the basics of heat-hydraulic calculations of heat exchanger. This also means explanation of ways of heat transfer and heat exchanger function. There are told about specific access to the solving problem of fluid laminar flow. The third chapter is detailed focused to the calculating of heat exchanger. At first is discussed factors, which have impact to the flow character. Next are detailed descriptions of design and controlling calculations, including more alternative ways to solve it. Next chapter exploit those results for deciding, which flow arrangement will be better for given case. Last chapter contain realization and reformulating of process heat exchanger calculating to the program code in Maple. There is also description of used algorithms and operating with them, so any user could be able to work with it. In this master’s thesis are used many examples from attached programs on different parts.
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Solutions of inverse problems in the area of material and heat exchangers
Kůdelová, Tereza ; Nechvátal, Luděk (referee) ; Čermák, Jan (advisor)
This master’s thesis deals with the dynamic behaviour of the heat exchangers which is described by a system of differential equations. In this connection, it contains general informations about heat transfer, heat exchangers and their arrangements. The main aim of this thesis is to solve the inverse problem of the antiparallel arrangement and discuss the question of the controllability, observability and identifiability of its parameters.
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Calculation prediction of characteristic parameters of combustion process
Táborský, Miroslav ; Kohoutek, Josef (referee) ; Jegla, Zdeněk (advisor)
The present thesis is focused on calculation prediction of characteristic parameters of combustion process in combustion chamber which is installed at burners testing laboratory. In the thesis basic theoretical knowledge needed for description of heat transfer in process combustion equipment are given. The Plug Flow Furnace Model is based on this knowledge. This model is used to evaluation of specific heat flux in tube furnaces. In the next step the Plug – Flow model is modified and adapted on the combustion chamber. Obtained results are compared with a measured data. By this comparison quality of this model is assessed.
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Improvement of energy supply in industrial process
Pavlíček, Lukáš ; Nerud, Pavel (referee) ; Pospíšil, Jiří (advisor)
The main subjekt of that diploma thesis is an optimalization energetic ekonomy of a bathroom. The ojective is propose suitable resolution for decrease decrement heating and employ outlet heat of burnt gas which are going from steam generator. In the first part of thesis is evaluation inceptive state, inlet and outlet flows of energies. In the next part, there are confront indivudual resolving from technically angle and economically angle.
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Plumbing Systems for Baking Plants
Hruška, Jan ; Vrána, Jakub (referee) ; Bárta, Ladislav (advisor)
This diploma thesis deals with plumbing systems of baking plants v Modřicích. The first part looks for a solution exchange of heat and using waste energy from bakery owens. There are performed several possiblities of projects for plumbing systems. Project part was worked out in cooperation with technical company wich produces equipment for bakery factories. The solution according to relevant standards
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Mathematical Model of Membrane Distillation
Hvožďa, Jiří ; Komínek, Jan (referee) ; Kůdelová, Tereza (advisor)
Diplomová práce se zabývá membránovou destilací, především z matematické perspektivy. Jedná se o tepelně poháněný separační proces, ve kterém se pro rozdělení kapalné a plynné fáze používá porézní membrána. Kapalina se vypařuje a její plynná fáze prochází přes póry v membráně. Během tohoto procesu dochází k tepelné i látkové výměně, které jsou popsány systémem parciálních diferenciálnich rovnic. Další model je založen na analogii s elektrickými obvody, zákonu zachování energie, hmotnostní bilanci a empirických vztazích. Je ověřen s experimentálně naměřenými daty z nové alternativní destilační jednotky používající membránu a kondenzátor z polymerních dutých vláken. Výkon a účinnost jednotky jsou vyhodnoceny. Další možná vylepšení jsou navržena.
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Modern technological elements for tubular heat exchangers
Plánková, Tereza ; Babička Fialová, Dominika (referee) ; Jegla, Zdeněk (advisor)
The aim of this diploma thesis is to get acquainted with modern technological elements currently used in shell-and-tube heat exchanger in the shell-side and tube-side, thermal-hydraulic calculation of selected elements and comparison of thermal-hydraulic properties with classically used competing technological elements. The work deals mainly with EM baffle in the tube-side and tube inserts like the twisted tape type (and its modifications) and coiled wire in the tube-side. The theoretical part is focused on acquaintance with classical technological elements in shell-and-tube heat exchanger and with basic thermal-hydraulic calculations, practical part then on acquaintance with modern elements and thermal-hydraulic calculation of selected elements. These calculations are then compared with the results of the thermo-hydraulic calculation of similar elements.
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Simplified modelling of tube bank heat exchanger in CFD
Cacková, Tereza ; Juřena, Tomáš (referee) ; Vondál, Jiří (advisor)
The master thesis deals with the replacement of heat exchanger surfaces during simulations in the ANSYS Fluent. The aim of this work is to find a simplified model of the heat exchanger usable for flow simulations in large process and energy units, where it is not possible to model the entire heat exchanger in detail. The calculation procedures are applied to „tube bank” heat exchanger. The master thesis is divided into three parts. First part deals with pressure losses. The "porous zone" approach is used as a replacement for the heat exchanger surface. In the second part, the heat transfer by convection and conduction through the heat exchanger is replaced by the "Heat Exchanger" module. The third part examines the influence of material properties, heat source and fixed temperatures on incident radiation. All calculations resulting from the methods are performed using a script that prepares the output data in format suitable for insertion into ANSYS Fluent. A simplification, which faithfully replaces a fully modeled heat exchanger, has been found in all three parts of the thesis.
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