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Complex simulator of the solar irradiance
Petrov, Roman ; Radil, Lukáš (referee) ; Ptáček, Michal (advisor)
This work consists of a theoretical part, which deals with various ways of mathematical equations to model the thermal photovoltaic cell. Thermal modeling describes a photovoltaic cell temperature, and heat capacity of the photovoltaic cell. This temperature is usually function or directly dependent on the intensity of solar radiation. In the theoretical section explains several ways to model thermal photovoltaic cells. Thermal modeling is outside the scope of this paper, it is mainly the modeling of solar irradiance, which is discussed in detail in the next section, and then in the practical part. The practical part is concerned with constructing mathematical equations that describe the intensity of solar radiation. These mathematical equations are then used to build a mathematical model. The actual mathematical model is created in a computer program PSCAD, wherein the main input parameter of the intensity of solar radiation. This model can simulate the course of the sun, for which it is necessary to set various parameters such as: region, time of day, the seasons, but also has a function that is essential for modeling of solar radiation intensity, and it is cloudiness. Cloud is fundamentally changing the size of the radiation intensity, and its direct constituents. After compiling a complex simulator of solar irradiance, this simulator is tested for its validation in form of doing couple of graphical runs of intensity of solar radiation for various locations on Earth, which are time dependent.
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Hydraulic analysis of small water supply system
Sucháček, Tomáš ; Kučera, Tomáš (referee) ; Ručka, Jan (advisor)
This document aims on aplication of sophisticated software programs to accomplish hydraulic analysis of real water supply. In this work is stated a list and description of software enabling to accomplish static or long-term hydraulic analysis of water supply when the most world used program EPANET 2.0 is described more deeply. There is described working of a EPANET and his algorithm also there are explain principles on which EPANET is based. During the hydraulic analysis of real system was used two sophisticated software it were MikeNet and EPANET 2.0. With using these two sophisticated programs was processed hydraulic analysis of chosen water supply of small consumption area, during this analysis was studied influence of method distribution node´s demand on achieved results also was created map of velocity in water pipeline. This work is first step for continuing Master´s thesis which will be using results of hydraulic analysis for create plan of elimination sludge in water supply.
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Analysis of the age of water in the pressure sewer network
Zuzaňák, René ; Nevrlý, Robert (referee) ; Ručka, Jan (advisor)
The thesis deals with the age of wastewater in the pressure sewer network in the village of Horní Ředice, Pardubice district. In the introductory part of the thesis the current state of the problem is presented. The second part focuses on general principles for design and operation of pressure sewers. In the practical part, the area of interest was first characterized and the sewerage system in the municipality was described. A quasidynamic hydraulic model of the entire pressure sewer network was developed to determine the age values of the wastewater in the pressure sewer network. The operating conditions were projected in the simulation model of EPANET 2.2. Pressure ratios, wastewater age, flow velocities and flows in the pressure sewer network were considered in the processing of the hydraulic analysis results. Based on the results of the hydraulic analysis, measures to improve the conditions in the pressure sewer network were proposed.
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Determination of hydrodynamic load acting on overflowed bridge deck using numerical simulations
Stoklas, Jan ; Picek,, Tomáš (referee) ; Špano, Miroslav (advisor)
The subjekt of this diploma thesis is a quantification of hydrodynamic load of the overflow bridge deck using numerical simulations. The simulation was performe for eight different discharges, which correspond to different degrees of inundation of the bridge deck using different turbulent models in Flow-3D software. The result of the calculation are the values of the hydrodynamic load– the horizontal force, the vertical force and the moment acting on the bridge deck. Furthermore, drag coefficient, lift coefficient and moment coefficient were quantified. Finally, the results of turbulent models were compared with each other and with result of physical experimental testing.
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Mathematical modelling of CSO chambers
Studnička, Tomáš ; Jandora, Jan (referee) ; Habr,, Vladimír (referee) ; Prax, Petr (advisor)
The thesis is concerned with the use of 3D mathematical modelling for flow simulation and separation efficiency in a single side weir CSO chambers. Analysis of the effect of turbulence model and computational grid on simulation results has been carried out in order to maximize the efficiency of numerical simulations. The goal of the thesis is to examine the effect of scum board position on separation efficiency of a single side weir CSO chamber.
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Modelling of flows in a heat exchanger
Hudeček, František ; Milčák, Pavel (referee) ; Špiláček, Michal (advisor)
This thesis considers problematics of calculating and designing heat exchangers. First way of solving the designing problem is by using mathematical formulas for heat transfer, which are based on manifold measurements. Second approach is can be considered modern as the designing of heat exchangers is realized by using computing technology and appropriate software for simulation of flow and heat transfer. These computations are realized for specified type of heat exchanger that is chosen after a brief research. The results are then post processed, commented and these two approaches are compared and evaluated.
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Optimization of the Water Supply Network of Počátky Town
Pavelka, David ; Netušil, Lukáš (referee) ; Kučera, Tomáš (advisor)
This diploma thesis focuses on the optimization of water supply system in the town of Počátky. It describes the process of creating a mathematical model needed for the hydraulic analysis, which was used to assess the water supply system Počátky. This thesis task is to apprise reader, with a basic distribution in the drinking water supply, how to proceed in collecting data on hydraulic analysis requirements and using tools and means used in hydraulic analysis. Conclusions are processed variants for possible optimization of water supply system Počátky.
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Back and forth between science and reality: Mathematical modelling in tasks with a science context (didactic experiment)
Šmíd Ridzoňová, Ráchel ; Havlíčková, Radka (advisor) ; Vondrová, Naďa (referee)
Mathematical modelling is part of the focus of the educational area "Mathematics and its applications" in the Czech national curriculum and is also a widely studied topic abroad. However, it does not receive much attention in Czech research. This thesis aims to introduce the concept to Czech readers and test the connection of mathematical modelling with science topics and the implementation of modelling tasks in the 5th grade of primary school. The thesis presents mathematical modelling as solving process of a complex problem with a real context in steps (0) undertanding the problem, (1) creating the real model, (2) mathematization, (3) mathematical operations, (4) interpretation of the result and (5) validation of the solution. Modelling competence, the modelling probem, and the relationship to word problems are also described. The chosen qualitative research method of didactic experiments explores the application of a holistic and analytical approach to teaching, identifies the difficult steps of modelling for 5th- grade students, and provides insights into cross-curricular relationships and organizational forms in the teaching of modelling. The research findings positively demonstrate that incorporating modelling tasks into regular lessons and linking them to science topics is possible but...
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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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Assessment of pressure conditions in the water supply network of the municipality of Ústí
Kuchař, Jakub ; Rajnochová, Markéta (referee) ; Ručka, Jan (advisor)
The bachelor's thesis is devoted to the hydraulic analysis of the water supply network of the municipalities of Ústí, Skalička and the settlement of Kamenec. The village is located in the Přerov district. The first chapter describes the theory of mathematical modeling and the basic relationships for calculation in pressure pipe systems. A quasi-dynamic hydraulic model of the entire area was created from the measured pressure values of the water supply network. The assessed values were displayed in the EPANET 2.2 simulation program. With regard to the character of the development in the municipalities, the pressure conditions in the area were assessed using the result. The last part of the work is dedicated to proposing measures to optimize pressure conditions and the resulting impact on the territory.
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