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Ventilation of the building envelope
Šagát, Erik ; Chybík,, Josef (referee) ; Bura,, Roman (referee) ; Matějka, Libor (advisor)
The dissertation thesis is focused on non-transparent ventilated façade constructions, airflow in the ventilated cavity and the building envelope temperatures in relation with the different parameters of the construction and the ventilated cavity. The aim of this work is to optimize the temperature behavior of the building envelope during the summer season when the overheating is the most distinctive. The numerical and experimental methods with many different variants of façade constructions were used to investigation. The variants were compared and evaluated by the measured values of airflow speed in the ventilated cavity, temperature in the ventilated cavity and on the surfaces of constructions around the cavity. The result of the investigation is the evaluation of the influence of the airflow resistances or the reflectance of the surfaces around the ventilated cavity. Part of the thesis was formulated in relation with the project of MPPF - Multifunctional Plug & Play Facade during the internship at TU Graz. The efficiency of some parts of the energy active façade in this project depends on the temperature. The part of the results is the patented passive system for ventilation of building envelope and the patented cavity panel for ventilated facades.
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Heat exchanger for rescue habitat
Bouma, Adam ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This thesis deals with the specific issues of designing a suitable type of heat exchanger for ventilation in a rescue habitat. The paper presents an overview of the most common types of heat exchangers and characterizes basic heat transfer mechanisms (radiation, convection). Based on the above and other knowledge, a thermal-hydraulic calculation model suitable for a regenerative heat exchanger type is compiled and the necessary calculations are performed. The thesis also contains an evaluation of the results for three materials which can be used in the production of a heat exchanger (aluminum, copper, steel).
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OPTIMIZATION OF WELLNESS AIR CONDITION
Kysilka, Michal ; Zubíček, Vojtěch (referee) ; Šikula, Ondřej (advisor)
The theme of diploma thesis is a design optimization of air distribution in swimming-pool hall with regard to free water surface evaporation. This problem was solved according to determined criterions with the aid of CFD simulation. Experimental measurement part of the thesis deals with evaporation problems where own formula for this physical phenomenon is determined. This formula is compared with already known algorithms. Author suggests that such formula might be integrated in CFD software.
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Thunderstorms occurrence in the Czech Republic
Kovář, Jan ; Krška, Karel (referee) ; Jebáček, Ivo (advisor)
This bachelor thesis focuses on storm situations in the Czech Republic and their occurrence in the period 1961-2020. It analyses the conditions of occurrence and appearance of thunderstorms and describes the storm activity at Karlovy Vary, Prague-Ruzyně, Brno-Tuřany and Ostrava-Mošnov airports in the period between 2001-2020. Marginal mention is made of the phenomena accompanying the storm, conditions of its passage and methods of detection.
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Experimental and Numerical Assessment of the Heat Transfer Coeficients for Industrial Steam Turbine for Siemens Industrial Turbomachinery
Hladík, Petr ; Pospíšil, Jiří (referee) ; Hrabovský, Jozef (advisor)
The subject of this diploma thesis is experimental and numerical assessment of the heat transfer coefficients during condensation of water steam in simplified parts of an industrial steam turbine. This simplified part is a pipe with circular cross section, which is often used in simulations of processes inside the steam turbine. The first part of thesis describes theoretical basics of heat transfer during conduction, convection and condensation. The content of other chapters is description of methods used to determine heat transfer coefficient. These are: ex-perimental analysis performed on a measuring device and evaluated using finite element ana-lysis (FEA), computational fluid dynamics analysis (CFD) in ANSYS CFX and analytical calculations of heat transfer coefficients using mathematical models for condensation. Thesis is concluded by validation and comparison of obtained results.
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The Mpemba effect and its use in applications
Wittek, David ; Hejčík, Jiří (referee) ; Mauder, Tomáš (advisor)
Hot water appears to freeze faster than cold water. Already Aristoteles mentions this seemingly meaningless fact in his writings. However, to this day no one has been able to fully clarify this phenomenon. Work is focused on factors, which may affect the freezing process of liquids. The composition of the experimental set up will be designed to approach the conditions of the pioneer of scientific research on this issue, E. Mpemba. He has obtained the most convincing results confirming existence of the phenomenon. Based on results, it will be discussed possibilities of practical application, for example for saving time during freezing.
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Thermal properties of electric machine
Buřil, Pavel ; Vítek, Ondřej (referee) ; Janda, Marcel (advisor)
This bachleor's thesis is dealing with choosing of right consecution for simulation of thermal attributes (propagation of heat) in electrical machines. In next part, there is descripted redraw of the real model of machine with using FEM and following simulation in Ansys Workbench development environment. Base was the real measurement of asynchronous motor. In detail shows today's usual methods of development in similar problematics. Purpose of tihs Bachleor's thesis is to serwe as a study aid.
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Heating systems in preschools
Schäferová, Hana ; Topič, Jan (advisor)
The topic of a master thesis is solution of infant’s school heating. The thesis summarizes state of art infant’s school heating from practical and legislative point of view. The thesis contains solution of infant’s school heating created by author of thesis. In addition, the thesis contains an experiment which is focused on examination of heat output from cover radiator.
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