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Study of behavior of fiber structures under low pressure
Heliová, Magdaléna ; Peterková, Jitka (referee) ; Zach, Jiří (advisor)
The diploma thesis deals with study of behavior of fibrous organic insulants under greatly reduced pressure (even to vacuum). Development, production and durability of vacuum insulating panels are described in the theoretical part as well as principles of heat transfer. Method for production of core of VIP, created using waste fibers from textile industry and agriculture, is described in the practical part. Verification of behavior during normal and reduced pressure (even to vacuum) was carried out on experimentally made core insulants.
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Materials and their application in low temperature parts of STM microscope
Voňka, Jakub ; Vlček, Ivan (referee) ; Urban,, Pavel (advisor)
Průtokvý kryostat s kapalným héliem (LHe) je vyvíjen skupinou Kryogeniky a Supravodivosti na Ústavu Přístrojové Techniky pro stávající rastrovací tunelovací mikroskop (STM) pracující za pokojové teploty na Ústavu Fyzikálního Inženýrství. Tato bakalářská práce se zabýva výběrem materiálů a určením jejich vlastností pro potenciální využití v některých částech nízkoteplotního STM mikroskopu (LT-STM), se zaměřením zejména na tepelnou vodivost v teplotním rozsahu od 4 K do 300 K. Je zde probírána problematika měděných svazků pro tepelné spojení vzorku s tepelným výměníkem. Slitina CuCrZr byla podrobně zkoumána jako vhodný materiál pro držák vzorku. Byly určeny tepelné toky málo vodivými podpěrami založenými na styku sférických ploch pro použití jako izolace mezi studeným držákem vzorku a STM stolkem.
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Perspective materials for packaging
Gančev, Jan ; Psota, Boleslav (referee) ; Szendiuch, Ivan (advisor)
The first part of work deals with the theory of packaging of semiconductor chips and hybrid integrated circuits and defining material properties essential to the packaging. In the second, experimental part are defined the basic principles of heat transfer and heat dissipation of created package using thermocouple, thermal camera and static-thermal simulation. In the last part there is created design recommendations for package based on the comparison of the results.
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Thermal contact resistance of planar surfaces
Mateášik, Timko Marek ; Horák, Marek (referee) ; Mašek, Jakub (advisor)
Bakalárska práca rieši tepelné prechodové odpory rovinných povrchov v kontakte pre účely projektu tepelného spínača. Zameriava sa hľadanie vhodného matematického modelu na predikciu tepelných prechodových odporov ako možného riešenia pre optimalizáciu tepelného spínača. Práca sa skladá z teoretickej a praktickej časti. Teoretická časť stručne uvádza pozadie projektu a dôvod vzniku tejto práce. Ďalej rieši ako sú tepelné prechodové opdory denované a faktory, ktoré ich ovlivňujú. Následne uvádza prehľad existujúcich modelov na predikciu tepelných prechodových odporov, vhodnú selekciu modelov pre možné použitie a ich popis. Praktická časť sa zaoberá návrhom a výrobou medených vzoriek pre experimentálne merania, ich následnými úpravami a povrchovými meraniami. Ďalej rieši spôsoby merania, podmienky merania a samotné merania tepelných prechodových odporov. Za použitia modelov z teoretickej časti sú vykonané teoretické merania a za použitia testovacej komory experimentálne merania. Merania sú navzájom porovnané. Na základe výsledkov z meraní sú urobené úsudky, ktoré budú požité v budúcnosti pri vývoji vesmírnych komponentov.
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Lightweight plasters of modified composition for final surface treatment of ETICS
Neubauerová, Alena ; Ševčík, Milan (referee) ; Bydžovský, Jiří (advisor)
The diploma thesis is focused on the verification of the parameters of thin lightweight mineral plasters with modified composition. As alternative raw materials are used expanded perlite Vapex, calcined diatomite Celite and powder waste glass of fluorescent lamps. In the theoretical part is summarized knowledge from completed studies dealing with the issue of compensation porous filler component. In the experimental part is tested consistency of fresh mixture, physical-mechanical, sorption and thermal insulating characteristics. It is compared the appearance of the surface and summarized the results of measuring.
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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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Influence of thermal and moisture loads on the behavior of thermal insulation and repair materials based on silicates
Horáková, Lucie ; Peterková, Jitka (referee) ; Zach, Jiří (advisor)
Bachelor thesis dealt with the study of thermal insulating and repairing materials based on silicates. The theoretical part includes a literature search of conducted researches, which x focused on the development of thermal insulating and repairing plasters with low thermal conductivity, including the study of their hygrothermal behaviour and modification of capillary activity. Futher there is a description of the hygrothermal behaviour of building materials with the expansion of this issue on porous materials. The knowledge from theoretical part was used in the experimental part, particularly at designing recipes. According to the designed recipes there were blended samples of plasters on which were subsequently tested selected properties. The results were put into context with the results of the research teams from a literature search.
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Material properties research for use in high-temperature solar thermal storage tank
Šot, František ; Vala, Jiří (referee) ; TROJAN,, Karel (referee) ; Steuer,, Radek (referee) ; Šťastník, Stanislav (advisor)
The use of thermal storage energy, using phase change materials appears to be an effective way to store thermal energy storage with the benefits of the high amount of energy while maintaining isothermal nature of the process. PCM methods are used in latent thermal storage systems for heat pumps, as well as in solar engineering or for temperature control in spacecraft. The past decade has extended these principles for cooling and heating in the building. There are a number of PCM systems, which operate over a wide temperature range, are used in various applications. This document includes a brief overview of the development and analysis of available thermal storage working mainly on the principle of PCM.
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Calculation of flue gas properties
Štenclová, Kristýna ; Brázdil, Marian (referee) ; Pospíšil, Jiří (advisor)
This Bachelor´s thesis deals with properties of combustion products depending on temperature. The first part is theoretical and includes summary of basic terms of combustion. The second part includes a recherché. It is focused on elementary analysis of fuel and basic properties of combustion products, i.e. heat capacity, density, enthalpy, heat conductivity, kinematic viscosity and number of Prandtl. In the last part of thesis, there is an example of a spe-cific exchanger and his solving based on four various inputs of these properties.
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