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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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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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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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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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Model of a gas pressure regulator
Bartková, Tamara ; Tuhovčák, Ján (referee) ; Elcner, Jakub (advisor)
This bachelor thesis is focused on creating and verifying functionality of computing 3D model of a gas pressure regulator. The work contains review of different types of regulators and safety features, including descriptions of their function and main features. It also contains a description verification of the functionality of a gas pressure regulator, including measure of flow – pressure characteristics. The following part contains overview of creating a 3D computing model based on mechanical drawings. Lastly described is comparison of created model with real product.
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Atmospheric particles and their measurement
Kantor, Radek ; Elcner, Jakub (referee) ; Bělka, Miloslav (advisor)
The aim of this work is to find out what aerosols are, what properties they possess and how they can be measured. In today’s age, the term particles in the atmosphere, is highly talked about because it is known, that particles in the air can be inhaled and cause health problems. By measuring properties of particles from different sources, we can find out the danger level of such particles. One sample was measured by several different techniques and analyzed. Thanks to this analysis we can determine size distribution of particles and then their possible danger.
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Design of heating and ventilation system for two-storey family house after renovation
Potočník, Jan ; Elcner, Jakub (referee) ; Hejčík, Jiří (advisor)
The thesis is focused on the design of the reconstruction of a house built in the 70s of the last century. Part of this work is an introduction with the current state of the object and calculation of the appropriate heat losses. In the next step, renovations containing building insulation, replacement windows and doors, replacement of the heating system and the installation of air conditioning are made. Based on the design of the adjustments are again calculated heat losses and a comparation of energy savings is made. Another part of the proposal focuses in detail on heating system and its regulation. The final chapter deals with the design of the ventilation device using heat recovery. Attachments contain detailed calculations and necessary documentation.
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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 heating and ventilation system for the building with low energy costs
Halm, Petr ; Elcner, Jakub (referee) ; Hejčík, Jiří (advisor)
The thesis is aimed on a proposal from heating sources, heating systems and ventilation of family house. Designing of a house is provided by Keeo4design. This proposal contains a complex of two houses. The first one is used for residential purposes, the other is made up of mostly parking garages. The work focuses on heat loss calculation objects. Subsequently, on a proposal from heating sources, heating systems, ventilation systems and their regulation.
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