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Characteristic parameters of oxygen-enhanced combustion process
Hudák, Igor ; Hájek, Zdeněk (referee) ; Bělohradský, Petr (advisor)
Diplomová práce se zabývá spalováním zemního plynu při využití vzduchu s vyšším obsahem kyslíku (21–46 % kyslíku ve spalovacím vzduchu), tzv. kyslíkem obohaceným spalováním (OEC). Technologie OEC nalezla uplatnění v průmyslu, kde se jsou nároky na zvýšenou produktivitu, dosažení vyšší tepelné účinnosti, zlepšení vlastností plamene, snížení náklady, či zlepšení kvality výsledného produktu. Ačkoliv OEC přináší řadu výhod, je nutné zmínit i nevýhody jako: poškození zařízení, nestejnoměrné zahřívání, narušení plamene, zvýšené emise anebo zpětný zášleh plamene. Zkoušky proběhly na zkušebně hořáků, která umožňuje testovat hořáky nejen na plynná a kapalná paliva, ale i hořáky navržené pro kombinované spalování při maximálním výkonu hořáku 1 800 kW. Při zkouškách byl použit plynový „low-NOx“ hořák se stupňovitým přívodem paliva. V diplomové práci je popsán vliv obsahu kyslíku ve spalovacím vzduchu na emise oxidů dusíku (NOx), teplotu plamene, přenos tepla ze spalin do stěn spalovací komory, a také vlastnosti plamene, zvláště pak jeho stabilitu, tvar a rozměry. Zkoušky proběhly při výkonech 300 kW, 500 kW a 750 kW, přičemž pro výkon 750 kW proběhly testy jak při jednostupňové, tak dvoustupňové konfiguraci.
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Design of a Testbench for Reduce Temperature Testing of High-Pressure Pump Systems
Škývara, Tomáš ; Čáp, Jaroslav (referee) ; Ramík, Pavel (advisor)
The subject of diploma thesis is design of a testing cabin for high pressure pump testing under low temperature. The objective is to project a cooling system and a cooled testing cabin. Suggested cooling system must be sized to cool down the estimated power and the cabin is supposed to be located inside the existing testbench. There was peroformed an analytical calculation of thermic evaluation, several parts of calculation were verified using ANSYS program simulation. The second section of the thesis is focused mainly on the design, especially on design of testing cabin. The result of diploma thesis is prepared for utilization in Bosch Diesel s.r.o. Jihlava.
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Study of energy consumption reduction of block of flats
Svoboda, Lukáš ; Šteffek, Libor (referee) ; Ostrý, Milan (advisor)
The goal of the thesis is firstly to get all the information about the initial state of solved block of flats, which is located on the street Merhautova 76/954 in Brno – Černá pole, in terms of constructions, energy consumption and initial state of heating system. In the second part of the thesis, where are discussed the possibilities of reduction of energy consumption, variant drafts of reduction of energy consumption and their financial costs and the choice of optimal variant. Third part deals with assement of solved block of flats in terms of sustainable built environment by using tool to rate buildings in terms of sustainable built environment - SBToolCZ, evaluation of possibility to use renewables. In the end are written summaries and recommendations.
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Polyfunctional Building
Holub, Ondřej ; Kopřivík, František (referee) ; Košíčková, Ivana (advisor)
Diploma Thesis „Polyfunctional building“. The work deals implementation project of polyfunctional building in Jihlava. Object is situated on Jihlava suburb in emerging part called „Horní Kosov“. Land is gently sloping from west to east. It continues for Buková street. The building has six floors and a basement. The basement is made from monolithic reinforced concrete. It is used as garages. Floors are made of ceramic bricks with isolation . First floor contains four commercial premises and main entry for housing part. Seventeen flats are situated from second to sixth floor. Sizes of apartments are 1+kitchen corner to 4+kitchen corner with terraces and balcony. Roofing is solved with simple flat roof. Heating will be ensured with central heating. Every apartment, commercial premises, shared premises are going to have it’s own gas boiler. Polyfunctional building is connected on a local road – Buková street, which is connected to new communication. Within multifunctional building twenty parking slots is designed at the basement. Next fourteen parking slots is designed outside.
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Program for calculation of ventilation and heating in synchronous machine
Kolář, Pavel ; Ondrůšek, Čestmír (referee) ; Huzlík, Rostislav (advisor)
This master´s thesis deals with ventilation of synchronous generators with a cylindrical rotor. For the design of ventilation we apply basic physical laws in the field of hydromechanics and thermomechanics. Therefore the first chapters are devoted to these subjects. They are followed by the description of ventilation systems and a thermal net is created and solved for one of them consisting of the thermal resistance and sources. The final part deals with a program, which I developed in Visual Basic 2008 Express Edition. This program enables to calculate the ventilation and heating of individual parts of the machine after entering basic machine dimensions and losses.
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Heat flux calculation during boiling process – application for cooling of combustion chamber
Földváry, István ; Pačíska, Tomáš (referee) ; Vondál, Jiří (advisor)
There is a water-cooled combustion chamber at the Institute of Process and Environmental Engineering, which is used for testing of burners. Effective cooling is a particularly significant problem. It is also necessary to ensure accurate measurement of wall heat flux extracted by the cooling water. Therefore the main aim of the thesis is calculation of the minimum flow rate of cooling media required for safe operation of the combustion chamber. A comprehensive review of the heat transfer mechanisms was performed. Description is provided for the basic characteristics of phase changes with an emphasis on detailed analysis of mechanisms of boiling and evaporation. The presence of boiling at the water-side wall in the inner mantle was verified in the calculation part. Computation of the heat transfer coefficient was done by using the similarity methods. Temperature of the wall was then evaluated. A control on the presence of nucleate boiling was performed and the required minimum flow rate was determined for each section of the chamber.
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An assessment of returnability of solar collectors installation in low-energy family house
Hrbata, Jiří ; Pešek, Martin (referee) ; Jaroš, Michal (advisor)
Increasing of standard of living, automation and mechanization of production and industrial growth lead into energy need growth. At the same time the energy prices continuously rise and it is still more preferable to use renewable energy, particularly solar radiation. This thesis contains basic information about usefulness of solar radiation, solar collectors and ways of their integration into heating systems. Particularly, it deals with the assessment of returnability of solar collectors instalation in the low energy family house. It contains calculations of necessary heat for heating, hot water heating and energy gains from solar collectors. Returnability assessment is demonstrated on concrete example.
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Experimentální tepelná analýza horizontální konstrukce pláště dřevostavby s kavitou
Švehlík, Matěj
Thesis is focused on thermal-insulation properties of wood fibreboards and building structure model including non-ventilated air layer. In the first part, the influence of temperature and moisture content on heat conductivity coefficient and heat transfer coefficient of wood fibreboards was investigated. In the second part, the building structure model was prepared, consisting of CLT, air layer and wood fibreboard. Subsequently, the two above mentioned characteristics were determined in dependence on measuring temperature, air layer thickness and inner surface emissivity.
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Hodnocení tepelně-technických vlastností stavebních konstrukcí vybraného objektu odpadového hospodářství
Štěrbová, Hana
The aim of this work is to detect the thermal defects of the walls on the solid-state biogas plant of Šumperk city, situated in Horní Temenice. In the first part, I give the survey of literature dealing with biogas and the conditions for its formation, storage and use. Next part is focused on basic information concerning building construction and also primarily aspects of thermal processes. The second part of this work provides description of the biogas plant analyzed. The particular accent is placed on its weaknesses in the design for the conservation of thermal energy. On the basis of IR thermography, I finally evaluate detected thermal defects of the walls.
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Experimental heat flux declaration through soil or artifikal substrate using HFP01-SC sensor
VÁŇA, Jan
The aim of this thesis is to describe a method of measuring the heat flow through the substratum or soil with self-calibrating heat flux sensor HFP-01SC (Hukseflux, The Netherlands) and to confirm the appropriateness of its use. In addition, this paper should be a manual for applications using this sesnor. Submitted work should be a contribution to disciplines dealing with measurement of heat flow through the substratum or soil.
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