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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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Computational Modeling of Turbulent Swirling Diffusion Flames
Vondál, Jiří ; Klemeš,, Jiří (referee) ; Tuček,, Antonín (referee) ; Hájek, Jiří (advisor)
Schopnost predikovat tepelné toky do stěn v oblasti spalování, konstrukce pecí a procesního průmyslu je velmi důležitá pro návrh těchto zařízení. Je to často klíčový požadavek pro pevnostní výpočty. Cílem této práce je proto získat kvalitní naměřená data na experimentálním zařízení a využít je pro validaci standardně využívaných modelů počítačového modelování turbulentního vířivého difúzního spalování zemního plynu. Experimentální měření bylo provedeno na vodou chlazené spalovací komoře průmyslových parametrů. Byly provedeny měření se pro dva výkony hořáku – 745 kW a 1120 kW. Z měření byla vyhodnocena data a odvozeno nastavení okrajových podmínek pro počítačovou simulaci. Některé okrajové podmínky bylo nutné získat prostřednictvím dalšího měření, nebo separátní počítačové simulace tak jako například pro emisivitu, a nebo teplotu stěny. Práce zahrnuje několik vlastnoručně vytvořených počítačových programů pro zpracování dat. Velmi dobrých výsledků bylo dosaženo při predikci tepelných toků pro nižší výkon hořáku, kde odchylky od naměřených hodnot nepřesáhly 0.2 % pro celkové odvedené teplo a 16 % pro lokální tepelný tok stěnou komory. Vyšší tepelný výkon však přinesl snížení přesnosti těchto predikcí z důvodů chybně určené turbulence. Proto se v závěru práce zaměřuje na predikce vířivého proudění za vířičem a identifikuje několik problematických míst v použitých modelech využívaných i v komerčních aplikacích.
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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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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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Study efficiency of modern thermal insulation for buildings
Šot, Petr ; auditor, Karel Trojan, Brno, energetický (referee) ; Šťastník, Stanislav (advisor)
The bachelor´s thesis deals with the problem of thermoreflect insulation. The small part of thesis focuses on the energy demand of buildings and its problems. Then the greater extent is analysed problems by heat transfer of material. It includes effects arising from the individual methods of heat transfer and defines the level of expression of individual methods of heat transfer in materials. The thesis presents an overview of experimental methods for determining thermal insulating properties of insulators. Then there is shown a selection of the most widespread insulation materials used in today´s construction. It includes the division of insulators in terms of used materials and subsequent classification of the most used materials in these groups. Another part of thesis deals with the thermoreflect isolation. There are mentioned the necessary concepts for the study of thermoreflect thermal insulation, which include the emissivity surface, the coefficient of mutual radiation and translucency of the material. Then there is described the method heat transfer of thermoreflect isolation. On the next there are presented experimental methods of determining thermal insulating properties thermoreflect thermal-insulating material. The thesis also includes a practical part, which contains the measurement results on a small range of samples taken termoreflection insulators. In the end there is mentioned a brief realization of thermoreflection thermal insulation materials in buildings.
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Analysis of the distribution of the temperature profile in the furnace brazing using CAE systems
Stručovský, Aleš ; Vyroubal, Petr (referee) ; Maxa, Jiří (advisor)
The aim of this project is using the CAE system to analyze the distribution of the temperature profile brazing furnace DIMA 0180. To create the model is used SolidWorks Premium 2012. The simulation is performed using the Flow Simulation. This work builds on the knowledge diploma thesis by Martin Procházka titled The effect of different heat capacities and components on the longitudinal temperature profile for reflow soldering. We start from the knowledge of heat transfer, especially of heat conduction and radiation, which appear in the furnace.
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Investigation of impact of radiant heating and cooling on car driver thermal comfort
Pavlík, Vojtěch ; Tuhovčák, Ján (referee) ; Fišer, Jan (advisor)
This diploma thesis is focused on the matter of radiation heating, thermal comfort maintenance and setting optimal operation parameters for heating system equipped with radiation panels. The research section summarizes the effects most important for thermal comfort, methods of its determination, heat exchange distribution between the human body and its environment, and technical possibilities of heating car interiors. The central points of this work are the simulation of car interiors heated with radiation panels and the evaluation of thermal comfort with a virtual mannequin. Thermal state was determined via the equivalent temperature and thermal comfort zones diagram (method by O.H. Nilsson). Forty-two simulated scenarios led us to conclude that thermal comfort is not possible to obtain with panels exuding a maximum temperature of 43 °C and the combination of several heat sources is required. Nevertheless radiation heating considerably contributes to energy savings without the loss of thermal comfort in assessed car.
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Verification of thermal-insulation properties of the foil materials
Šot, Petr ; TROJAN,, Karel (referee) ; Šťastník, Stanislav (advisor)
The master´s thesis deals with verification of thermal insulating property of thermoreflection foil insulations. The teoretical part of thesis focuses on the energy demand of buildings, the problems of heat transfer material, terms required for study of thermoreflection thermal insulation and experimental methods for determination of thermal insulating properties of insulators. In the next part the chapter is accompanied by an overview of the most common insulation materials which used in construction. The last part of teoretical part is devoted to the description of thermoreflect formation and analysis of the spread of thermal insulating layers of thermoreflection thermal insulation. The first part of thesis is devoted to the use of thermoreflection therm insulation in buildings. The second part of thesis is devoted to the design, assembly and calibration of the measuring device that uses a method of protected warm chamber. It is declared as a binding method of detection of the heat transfer performance of thermoreflection thermal insulation. The developed measuring device allows detection of endpoints in some direction of propagation of heat. Measurment of heat transfer coefficient devoted the third part of practical part. This part contains a description of the samples used for the measurement of the heat transfer coefficient. In the fourth chapter of the practical part are presented the results of the heat transfer coefficient measurments on selected samples of thermoreflection foil insulation. It is shown the characteristic of heat transfer coefficient of individual samples, the dependence of the heat transfer coefficient on the position of the sample in the measuring device and the recommendation of an appropriate use of sample in the works for the climatic conditions of the Czech republic. The work concludes the chapter of comparing and evaluating of all samples with practical recommendations.
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Optimization of air conditioning in the office building
Hrbáček, Tomáš ; Uher, Pavel (referee) ; Blasinski, Petr (advisor)
The diploma thesis titled "Optimization of air conditioning in the office building" deals with the issue of heat load. Its understanding and correct determination is the primary step towards the correct design of air conditioning systems. The work is divided into three parts. The first part of the work, the theoretical part, serves to bring closer the theory of heat gains and heat load. Specifically, it is the external part of the thermal load, its division, description and calculation procedure of the individual parts. The second part of the work, the calculation part, focuses on the application of theoretical knowledge to a specific building. Specifically, on the proposal of two alternative solutions for the current state of the air-conditioning equipment in the 3rd floor of the administrative building serving the meeting ro-om. These are more economical variants, which, compared to the original design, carry with them certain limitations in the form of reduced comfort of use. The object for which alternative proposals were prepared is an administrative building in the town of Náchod in the Hradec Králové region. It is a four-story building with a flat single-skin roof. Inside the building, there are mainly office, communication and hygiene spaces. The third part of the thesis deals with the application and partial automation of the thermal load calculation procedure from the theoretical part and examines the influence of the glazing area of facades on the solar gains of various buildings. It describes the method of calculation, the data obtained and finally summarizes and evaluates the results. Excel software and the VBA programming language, whose development environment (IDE) is integrated in Excel, were used for the calculations.
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Ionizing radiation as a topic of environmental education
VANĚČEK, Marcel
Ionizing radiation is a physical factor that has a significant effect on human health. An average person on Earth is irradiated at an average of 2.4 mSv per year. Most of this dose comes from natural sources, especially radon. High levels of radon are the second most common cause of lung cancer after smoking. At present there is an increase in exposure from medical sources which in some developed countries may equal to exposure from natural sources. Basic knowledge about sources of ionizing radiation, its effects and protection against it should be known to all high school students. The diploma thesis focuses on ionizing radiation from the perspective of high school teachers and students. It is divided into two main parts. In the first theoretical part the issue of ionizing radiation as a physical factor affecting human health is discussed. It describes the origin of ionizing radiation, basic concepts such as radioactivity and half-life, there are different types of radiation, individual sources, effects and protection against it. The second practical part is focused on examining the knowledge of high school students on this issue. The work tries to solve several goals. The first goal of the thesis is analysing the approach of high school teachers to information about the topic of ionizing radiation. The second goal is to verify the knowledge of high school students. The third goal is to evaluate whether high school students have a better knowledge of the topic of ionizing radiation than grammar school students. The fourth and last goal of the diploma thesis is to write a freely accessible material about the topic of ionizing radiation for high school teachers and students. This material will serve as an information source during the creation of the educational material for teachers teaching on the topic of ionizing radiation, but it can also be used by students while preparing seminar papers.
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