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Thermodynamics of ideal gases in Matlab
Zábojník, Jakub ; Klimeš, Lubomír (referee) ; Štětina, Josef (advisor)
In terms of bachelor’s thesis a toolbox of functions for basic computing in thermodynamics with ideal gases and their mixtures was built in environment of computer program MATLAB. Source code of these functions and their description are parts of this thesis. Among others fundamental characteristics of thermodynamic values and terms on which the creation of functions was built, and instruction for calling of functions are mentioned here. Functions in toolbox imaginary are divided to some groups. This dividing is results from principle of thermodynamic calculation. Functions from two neighbouring groups are directly tied together. For lucidity of function sequences and for functions usage and toolbox explanation the examples of using functions examples of functions usage in specific thermodynamic calculations.
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Accurate positioning of pneumatic drives
Volf, Marek ; Nevrlý, Josef (referee) ; Marada, Tomáš (advisor)
Thesis starts with brief overview of the present role of pneumatic actuators. Further research is carried out in modelling and control of pneumatic actuators. A basic overview of thermodynamic laws is presented. These laws are used to assemble a mathematical model of the pneumatic drive. Subsequently the identification of model parameters is shown. A controller is propřed using fuzzy PID algorithms. Results are compared with the conventional PID controller.
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Application of refrigerant cooling for air conditioning of buildings
Vlček, Petr ; Rubina, Aleš (advisor)
Diploma thesis deals with the problem of refrigerant cooling needs for air conditioning systems of buildings. Summary focuses on the theoretical basics and the physical nature of refrigeration and air conditioning technology. The consequences of split unite on microclimate in the room was experimentally tested and simultaneously investigated happenings associated to its activity. The aim is to unify the theoretical and experimentally obtained facts and apply them in the designing of air conditioning units. Design of air conditioning systems builds on my bachelor thesis, "Hot-air heating of gym", which subject was the ventilation system of gym.
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Steam-gas cycle from a thermodynamic viewpoint
Pransperger, Jan ; Štětina, Josef (referee) ; Jaroš, Michal (advisor)
This thesis deals with thermodynamic of steam-gas cycle and compare that with some others heat cycles. It focuses on efficiency of cycle and its limits in the context of the second thermodynamic low. Also it shortly summarizes some technical solutions and possibilities of the cycle. The mentioned knowledge are applied to concrete example of Brno’s heat and power plant Červený mlýn (Red mill) in the last part and allow assessment of its efficiency.
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Thermodynamics of ideal cycles of IC engines in Matlab
Pavlíček, David ; Mauder, Tomáš (referee) ; Štětina, Josef (advisor)
Key aspect of this thesis is toolbox, which contains functions for calculate ideal combustion engine cycles. Thesis is divided into four parts. In the first part is briefly described history. The first chapter contains description of real combustion engine types. In the second part, which is covered by the second chapter, is located thermodynamic view. Third part is whole about MATLAB. From historical introduction through description of individual functions to example how toolbox can be used. In the last part is comparison of real combustion engine cycle with ideal one, which has been created by toolbox.
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Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
The thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, SCR catalysts and 1D simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of heat transfer through turbine housing with time dependent input values and predicting temperature of exhaust gas flowing through turbine outlet in compliance with NEDC cycle. Result analysis and a suggestion of subsequent actions follow.
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Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
Master thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, exhaust gas aftertreatment and heat transfer simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of exhaust gas output temperature and heat transfer through turbine housing. Heat transfer coefficients were calibrated for transient simulation predicting temperature of output exhaust gas in compliance with NEDC cycle. Results analysis and optimization follow, a suggestion on model integration into the virtual turbocharger system is also included.
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Thermodynamic 1-D model of the turbocharger of an internal combustion engine
Mrázková, Kristýna ; Böhm, Michael (referee) ; Štětina, Josef (advisor)
The thesis deals with 1D heat transfer simulation of turbine housing laying emphasis on temperature of exhaust gas leaving the turbine. The thesis covers construction and thermodynamics of turbochargers, SCR catalysts and 1D simulation software. Then the thesis focuses on exploring turbine housing 3D model discretization, building physical turbocharger model for 1D simulation of heat transfer through turbine housing with time dependent input values and predicting temperature of exhaust gas flowing through turbine outlet in compliance with NEDC cycle. Result analysis and a suggestion of subsequent actions follow.
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Thermodynamic modelling of hydrogen fuel cells
Nováček, Marek ; Pavelka, Michal (advisor) ; Němec, Tomáš (referee)
In this thesis, proton exchange membrane fuel cells are studied. At the beginning, the ideas underlying their function are exposed and some possibilities of usage are pre- sented. Thereafter, we aim to describe the processes inside the fuel cells with the aid of thermodynamics and in agreement with constitutive relations that have been obtained experimentally. Namely, we are interested in the fluxes of water and protons inside the membrane, where they are acted upon by thermodynamic forces, and the electrochemical reactions at the electrodes, which can be described by the Butler-Volmer equations. Also do we study the efficiency of the fuel cell by evaluating the production of entropy due to the diverse processes that take place in the fuel cell. It is the goal of the computational part of this thesis to propose a zero-dimensional model and compare it with the results provided in the supervisor's doctoral thesis. 1
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