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Acausal modelling of termomechanical problems using Modelica
Shestakov, Andrey ; Elcner, Jakub (referee) ; Pokorný, Jan (advisor)
The aim of this bachelor thesis was the development of a library for solving thermodynamics tasks in Modelica. The library contains models of cycles working with both the ideal gas, and the real substances. The main part of the work is the description and modeling of Steam Rankine Cycle and Organic Rankine Cycle that are applied in Waste Heat Recovery (WHR). The working principle of both cycles is similar. The main difference is in the working fluid. In this work, we give a technical economical assessment of the application of ORC system in concrete industry for energy costs reduction. The change of ORC parameters with the choice of particular working fluid is the main task of the thesis. Based on the simulated model results for selected working fluids (water, Cyclopentane, Toluene, Heptane, R123 and R245fa), we concluded that the highest efficiency was achieved with R245fa refrigerant for Organic Rankine Cycle in case of selected initial conditions.
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Application of HS camera to problems of fluid mechanics
Bolcek, Adam ; Elcner, Jakub (referee) ; Jedelský, Jan (advisor)
The main subject of this bachelor thesis is visualization of liquids and gases and their recor-ding with the help of a high-speed camera. The first part deals with types of the high-speed cameras. Also, it is concerned with the description of the Olympus i-SPEED 2 camera which was used for the experiment. Finally, the thesis investigates fundamental parameters of the high-speed cameras and their influence on the recording. The second part describes different methods of visualisation of liquids and gases and also consequent advantages and disadvantages of using each particular method. The last part is dedicated to the creation of my own recording of the visualisation of flowing of gas and its analysis and also to the finding of an optimal setting of the camera and of the lighting of the scene of the recording.
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Vizualization of flow of fibers from insulation mineral wool
Kedajová, Kristýna ; Elcner, Jakub (referee) ; Lízal, František (advisor)
One of the most used insulation materials of our time is mineral wool. As with formerly used asbestos, not all the health impacts of mineral wool fibers inhalation are known. The aim of this thesis is to gather findings relating to the transport of aerosols, their deposition in human airways and to obtain and statistically evaluate experimental data from the visualization of fibres in the glass tube resembling human airways. This data can improve understanding of the relation between glass fibres action and possible health hazard.
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CFD simulation of air flow inside a car cabin
Kučera, Cyril ; Elcner, Jakub (referee) ; Pokorný, Jan (advisor)
The diploma thesis deals with CFD simulating the air flow inside the car using the numerical calculation program Star-CCM+. The aim of the thesis was to prepare 3D geometry, resp. realistic model of the real car, preparing boundary conditions including material properties, simulating the steady state of the environment and evaluating the speed and temperature of the car cabin. The paper presents the results of the temperature distribution and air velocities in the cabin during the winter, spring and summer conditions in HVAC on and HVAC off modes. The monitored air temperatures and surface temperatures of the car parts are compared with the measured data. The average difference between simulation and measurement was at air temperatures of 2.3 °C and surface temperatures of 3.4 °C.
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Computational modeling of flow field with separation
Šamša, Petr ; Elcner, Jakub (referee) ; Jícha, Miroslav (advisor)
This diploma thesis is considering with computational modeling of flow field with separation. In the first part it contains theoretical bases of flow field computational modeling with RANS models equations and wall treatment modeling approaches included. There is also flow separation in asymmetric plane diffuser modeling described in the thesis where the most suitable turbulent model and the proper mesh parameters for the successful flow separation modeling should be chosen. Next the chosen turbulent model and parameters verification via flow separation modeling on the asymmetric 3D diffuser mesh. That analysis should ensure if the chosen turbulent model is applicable also for engineering problems. At the end of the thesis there is evaluation if the setup chosen in the thesis is suitable to apply in any practical aeroacoustics problem modeling.
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Pressure drop in modern pipeline
Přikryl, Pavel ; Pokorný, Jan (referee) ; Elcner, Jakub (advisor)
This bachelor thesis deals with the development of pipeline materials and especially aims on the current trends. It describes metal, plastic and multi-layer materials. Following part compares and evaluates these materials. This work includes a project and a realization of a model circuit in order to compare price and pressure drops of different pipeline materials.
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Electronic cigarettes - comparison of emitted particles
Buřil, Lukáš ; Elcner, Jakub (referee) ; Lízal, František (advisor)
This bachelor’s thesis focuses on the research and comparision of 3 electronic cigarretes with regard to emitted particles. The Subject of experiments was a small electronic cigarette cig-a-like, a common electronic cigarette GoTech eGo Ce4 and a higher class electronic cigarette iSmoka eLeaf iJust 2. For the purposes of this work an experimental track was constructed in the Laboratory of Aerosol Research at BUT FME. Emitted particles of cigarettes mentioned above were measured on this track by Lighthouse SOLAIR 3100 and TSI SMPS 3936. The aim of this thesis is to compare different types of electronic cigarettes.
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Design of heat pump for space heating system
Panáček, Jaromír ; Elcner, Jakub (referee) ; Katolický, Jaroslav (advisor)
The bachelor's thesis contains design options of the heat pump for a family house. First part of the thesis deals with the basic types of heat pumps and their usage in the particular conditions. The description of the family house along with basic parameters for the design of the heat pump itself is presented in the second part of the thesis. Therefore the heat loss computation and the heat needs of the household are listed. Various designs of the heat pumps with basic properties according to the given house come afterwards. The conclusion summarizes the overall comparison of the individual types from the investments, operating expenses and the choice of the designed heat pump point of view. Mathematical basics are enclosed in the appendix.
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Fuell cells
Sedláček, Tomáš ; Elcner, Jakub (referee) ; Hejčík, Jiří (advisor)
This bachelor thesis describes the distribution of fuel cells, principle of their operation and composition of the individual cell types. It states the advantages or disadvantages of the individual cell types and summarizes their basic parameters. This thesis also refers to the current state of development of fuel cells and convenient areas of their application.
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