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Effect of a Tension on Pressure Drop Across the Flexible Bank of Polymeric Hollow Fibres in Crossflow
Kroulíková, Tereza ; Baláš, Marek (referee) ; Dančová,, Petra (referee) ; Hnízdil, Milan (advisor)
Pressure drop, such as the heat transfer rate, is an important parameter in heat exchanger design. Its values also determine the required pump performance for given medium. Several empirical relationships defined for calculating the pressure drop over a bank of tubes have been preserved from the last century; however, these relationships are based on measurements performed on large rigid tubes, thus, they do not include flexibility of thin fibres, and the pressure drop values calculated by the model might not reflect reality. This dissertation thesis discusses the air-side pressure drop of a bank of hollow polymer fibres, in particular, the effect of the tension in said fibers. Therefore, other possible effects of influence, such as random fiber pitches and fiber length differences, were minimized. A special device was made for tensioning the hollow fibre heat exchanger in order to measure the pressure drop. A set of measurements was performed, and the measured values were analysed and compared to two empirical models. At the end of the thesis, two model proposals for two geometries, namely for heat exchangers with a staggered design and dimensionless pitches of 2x2 and 2x3.
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Possibilities of using hydrogen in the energy sector
Holík, Michal ; Lisá, Hana (referee) ; Baláš, Marek (advisor)
This bachelor thesis describes hydrogen energy and gives the reader an introductory look into the world of hydrogen technologies. The first part describes the production of hydrogen from fossil and renewable sources. The second part deals with the possibilities of processing and use of hydrogen in energy. The third part represents the specific application of its use.
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Power to gas system
Urbánek, Štěpán ; Baláš, Marek (referee) ; Pospíšil, Jiří (advisor)
This bachelor thesis deals with Power to Gas system and its subcomponents. The first part of this thesis is research of the Power to Gas subcomponents. In the second part a balance model of the Power to Gas system is developed based on the traced technical parameters from the first part. The third part deals with traceable implementations of the Power to Gas system and the last part is the design of the system for home implementation.
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Waste gas combustion
Krček, Robin ; Lisá, Hana (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the issue of using waste gases as fuel. The first part is focused on the production processes, properties and composition of selected waste gases. The following part is an overview of the methods used in the treatment and removal of pollutants from the gas. Finally, technologies that generate electrical, thermal or mechanical energy by burning waste gases are summarized.
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Design of a heating system for a house
Peřina, Petr ; Kalivodová, Markéta (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the proposal of a suitable heating system for a family house. The first part contains an overview of different methods of heating. The second part is focused on the calculation of heat losses and heat demand of a particular family house. In the third part, various heat sources are designed and compared for this object. At the end of the work, these proposals are evaluated and a suitable source, which would be advantageous to replace the existing one, is selected.
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Off-grid houses
Sedlák, Šimon ; Lachman, Jakub (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with energy efficient homes and the use of technologies leading to reduced reliance on utilities. The practical part describes the renovation of a single-family house into a hybrid house that uses available technologies to reduce dependence on utilities.
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Dry flue gas loss of fireplace stove reduction
Vodvárka, Petr ; Lachman, Jakub (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the reduction of chimney heat loss of a fireplace stove with waste heat recovery. The results are the design of a functional heat exchanger and the calculation of the heat output. The heat exchanger must be designed for specific fireplace stove existing in a real living room and with realistic parameters. Technical documentation of the fireplace stove and a drawing of the heat exchanger are included in this thesis. Calculations of the reduction of chimney heat loss using the heat exchanger on a chimney are included in the conclusions. The advantages and disadvantages provided by using the heat exchanger are discussed.
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Technology Power to X
Řezník, Dominik ; Baláš, Marek (referee) ; Kracík, Petr (advisor)
The bachelor thesis deals with technologies for the electricity storage based on its conversion into another form of energy ("Power to X"). It considers the possibility of their use for the storage of electricity generated by renewable energy sources, which should gradually replace conventional electricity production in coal-fired power plants. The first chapter of the thesis is devoted to the current and possible future state of the electricity sector in the Czech Republic and a description of selected electricity generation technologies. The second chapter contains a classification and description of technologies suitable for electricity storage – their functional principles, advantages and disadvantages or e.g. possibilities of further use of products obtained by means of conversions are included. In the third chapter, selected parameters of these technologies are illustratively compared in created graphs, each containing two parameters. The results of the comparison are then continuously discussed.
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Assessment of three types of heat exchangers
Hlavinková, Valérie ; Toman, Filip (referee) ; Baláš, Marek (advisor)
The aim of this thesis is to assess selected three types of heat exchangers designed for emergency cooling. The theoretical part of this thesis consists of a research containing an overview of exchangers. It includes a description of the construction of exchangers, characte-ristics in terms of heat transfer and an indication of the areas of its use. The practical part deals with the thermal and hydraulic design of two tube heat exchangers and a plate heat exchanger. Finally, the evaluation of the designed exchangers is performed.
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Oil heater design
Daxner, Ján ; Toman, Filip (referee) ; Baláš, Marek (advisor)
This diploma thesis deals with the design of heat exchangers for crude oil heating. The first part deals with the theoretical basis of heat transfer, heat exchanger properties and oil properties. In the second part, a design of two heat exchangers was developed. In the first variant, oil was placed in the pipes and steam was placed on the shell side. For the second variant, the media placement has been swapped. The design part consists of the design of the geometry of the tubes, the shell, and the baffles. Furthermore, thermal, and hydraulic calculations were performed. At the end, the proposed variants were compared, and a more advantageous design was selected.
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