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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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Thermomechanical tire model
Vaníček, Jan ; Štětina, Josef (referee) ; Porteš, Petr (advisor)
This diploma thesis is about thermomechanics of passenger car tires. The research part dealing with existing tire models is followed by the practical part. The practical part is based on the designs of thermomechanical models. The first model determines a dependence of temperature on the air pressure inside a tire when a temperature changes. The second thermomechanical model captures all the heat fluxes which affect a tire while a vehicle is in motion. The third thermomechanical model calculates temperatures of parts of the tire during driving tests. All models are programmed in MATLAB.
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Development of vacuum insulation in construction and their possible application
Kováriková, Růžena ; Peterková, Jitka (referee) ; Zach, Jiří (advisor)
The subject of the thesis is to conduct an extensive literature review on the topic of vacuum insulation and their use in construction. Processing includes the development of these materials from their inception to the present. The theoretical part is devoted to the composition and production of vacuum insulation, which are available on the industrial market. On the basis of researches should be conducted suggestion of possible alternative core insulators primarily on the basis of secondary raw materials, which could be after evacuating used in the manufacture of vacuum insulation used in the building.
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3 omega thermal conductivity measurements
Juračka, Matěj ; Bejček, Ludvík (referee) ; Beneš, Petr (advisor)
The goal of this semestral thesis is to describe theory of the thermal conductivity measurement with method 3 omega. This work explains principle of the 3 omega method. It also analyzes two type of resistance heaters – suspended wire and line heater on substrate (for different substrate). Work also explains measurement with method 3 omega, which includes description of the important measuring device lock-in amplifier.
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