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Optimization of District Heating Nets Components Simulations
Kudela, Libor ; Klimeš, Lubomír (referee) ; Kořista, Milan (referee) ; Pospíšil, Jiří (advisor)
The thesis aims at the computational solution of district heating networks, their numerical optimization, and predictive control considering heat accumulation. Previous studies avoid using the so-called element method because of its computational expensiveness. However, in combination with current development in scientific computing, it adds a new dimension to the old method. This thesis presents a new simulation model of a district heating pipe with complex physics and efficient inverse problem-solving capability, which is the core of predictive control. The findings acquired in this dissertation allow us to maximize the computational effectiveness of simulation components found in district heating networks
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Accumulation of energy in "heat batteries"
Janečka, Filip ; Kudela, Libor (referee) ; Pospíšil, Jiří (advisor)
Thermal energy storage is an important alternative to other, more common methods of energy storage, such as electrochemical batteries, as most of the energy used in homes is in the form of heat. The use of thermal energy storage therefore skips the step where electricity is converted into heat, which can increase the efficiency of the whole process and reduce energy costs. In this paper, five important thermal energy storage methods are described and evaluated with respect to their use by an individual in a single family home as well as for use in high energy demand applications (central heating, power generation, etc.). The five heat storage methods are: ground storage, sand storage, PCM (phase change material) storage, thermochemical storage and hydrogen storage. Emphasis is placed on highlighting the advantages and disadvantages of each type of thermal storage reservoir, showing pilot implementations and comparing them with each other. Furthermore, an evaluation of the seasonal storage capability of the different thermal storage systems is made, which shows that the only storage guaranteed to be capable of almost unlimited storage time is the thermochemical storage system. Also in this work, a water heat storage tank for a single-family house is proposed, which was chosen because of its good scalability, proven functionality and relatively simple design.
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Design of a heat exchanger in a nuclear power plant
Kocanda, Tomáš ; Kudela, Libor (referee) ; Milčák, Pavel (advisor)
This bachelor thesis focuses on the design of heat exchange in nuclear power plant, more specifically on low-pressure heater 2. The introduction of bachelor´s thesis deals with the introduction of nuclear energy and nuclear power plants. The following chapters describe low-pressure regeneration as well as low-pressure heater. In the last part of the work, the heater is calculated from the entered values and values subtracted from the overall thermal scheme of the secondary circuit of the Dukovany nuclear power plant.
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Energy gains of agrofotovoltaics
Huf, Milan ; Kudela, Libor (referee) ; Pospíšil, Jiří (advisor)
This master's thesis focuses on the possible synergy between agricultural activity and solar energy production. The theoretical part of this work begins with the processing of theoretical knowledge in the field of photovoltaics. Furthermore, the concept of agrophotovoltaics is explained, its advantages and possible types of installation are introduced. Furthermore, existing installations around the world are presented and the situation around agrophotovoltaics in the Czech Republic is outlined. The practical part of the work is focused on the creation of the model and its programming so that the panels create shade for cultivated crops. The conclusion of the thesis is devoted to the design of an agrophotovoltaic installation in the Brno area and the assessment of its technical and economic aspects.
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The workings of Autonomous Greenhouses
Formánek, Adam ; Kudela, Libor (referee) ; Elbl, Patrik (advisor)
This research work aims to concentrate information from extensive literature dealing with autonomous greenhouse related topics. The first part of the work is focused on basic concepts related to autonomous greenhouses. The second part explains an amount of concepts defining the logical apparatus and logical principles used in autonomous greenhouse design. Furthermore, this work deals with the physical aparatus of intelligent greenhouses, primarily its actuators. Finally it deals with autonomous greenhouse competitions, with focus on their conditions and logic.
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Design of heat exchanger
Kopřivová, Anna ; Kudela, Libor (referee) ; Milčák, Pavel (advisor)
This bachelor thesis discusses a design of the water-steam type heat exchanger. The nature of heat exchangers is based on increasing the efficiency of thermal circuits. At the beginning of the thesis, a principle of these thermal cycles, namely Carnot’s and Rankine-Clausius’s cycles are described. Furthermore, in this thesis, I deal with heat exchangers alone together with their basic distinction and more detailed description with a closer look at specific sorting of the heat exchangers regarding their construction, which means recuperative, regenerative and direct contact exchangers. Special attention is paid to tubular exchangers, which create the core of thermal computation. Closing part involves a design of a low-pressure tubular heater by means of assigned parameters of work substances at the input and the output.
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Circuits of nuclear power plants
Pavlíček, Martin ; Kudela, Libor (referee) ; Milčák, Pavel (advisor)
This bachelor's thesis deals with the history and beginnings of nuclear energy, an explanation of the basic knowledge of nuclear energy and an introduction to the issue. Then, the division of nuclear reactors according to various criteria is described. Furthermore, the solution of individual circuits in a nuclear power plant is described according to the type of reactor used. The individual circuits are described at the Temelin nuclear power plant. The last part deals with nuclear safety and various safety systems, without which a nuclear power plant could not be started.
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Assessment reduced heat loss of an apartment house
Šimková, Nikola ; Kudela, Libor (referee) ; Baláš, Marek (advisor)
The rising trend in energy prices has led to the search for options to reduce its need. The bachelor thesis deals with the assessment of the heat loss reduction for an apartment building. In the introduction, it deals with factors affecting the energy consumption for heating. It reviews the heat loss of a building and possibilities to minimalize it, which leads to an energy performance reduction. Subsequently, it deals with the calculation procedure of the design heat loss for the model apartment building before and after the implementation of measures to reduce heat losses. In the end these two states are compared and evaluated with each other The result is an assessment of the reconstruction benefits.
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