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Luminance scanning of luminaires and light sources
Ševčík, Ondřej ; Baxant, Petr (referee) ; Škoda, Jan (advisor)
Práce se zabývá měřením křivek svítivosti světelných zdrojů a svítidel konvenčními a nekonvenčními metodami. Úvodní část práce je věnována popisu zrakového systému a základních fotometrických veličin. Hlavní teoretická část je zaměřena na popis současných metod měření křivek svítivosti a nových metod měření pomocí jasového analyzátoru. Současně jsou pro jednotlivé metody uvedeny zdroje nejistot, které ovlivňují výsledky měření. Těžiště práce spočívá v návrhu metodiky měření křivek svítivosti z jasových skenů svítidla a následném ověření tohoto postupu vlastním měřením. Dále bylo provedeno srovnání naměřených výsledků navrženým postupem, s výsledky konvenčního měření na goniofotometru s luxmetrem.
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Utilization of waste biomass for power generation
Smarž, Patrik ; Šejvl, Radovan (referee) ; Baxant, Petr (advisor)
Diploma thesis, in its introduction, describes the expression biomass and the ways of its production from various sources, focused particularly on waste biomass In the following part it deals with the description of its origin and the advantages of its usage. It describes the usage of biomass in the world as well as in the Slovak Republic. It also looks into the possibilities of processing of biomass and the following use at heat and electricity production. In its last part this work describes, on particular examples, the usage of biomass in electricity and heat production, from businesses with high power to its usage in houses.
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Use of modern inteligent wiring for building lighting
Hlinecký, Tomáš ; Bátora, Branislav (referee) ; Baxant, Petr (advisor)
This diploma thesis concerns with problematic of modern intelligent wiring systems in buildings, meanwhile presents their advantages against old classical wiring systems. Also deals with utilization and properties of modern components for regulation, switching and light controlling. The first part deals with light sources and possible ways how to control the power of individual luminary sources. The second part discuss about utilization of radio-frequency systems in new buildings and also in reconstructions. In the next part is described a possibility of bus system for controlling building illumination scope with focusing to control system Nikobus. The last part is concerned on technical-economical evaluation of intelligent wiring systems by various manufacturers according to specific requirements.
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Near-field photometry
Kutý, Tomáš ; Baxant, Petr (referee) ; Škoda, Jan (advisor)
This thesis is focused on the theoretical and practical introduction to the verification procedures used today for obtaining luminosity curves of lamps. The introduction acquaints readers with the photometric variables. Consequently, it is theoretically described procedure for constructing luminance curves by zonal flow and further familiarization with the near-field photometry. For the practical part was chosen several lights. These lamps were measured by luxmeter first from a very close photometric distance from lights, and then from large distance. The next step was to obtain pictures of luminaries in planes C 0 to 345 ° (with a step of 15 °) of the angle gamma from 0 to 180 ° (in steps of 5 °). The measured data were processed by zonal flow and through programs LumiDISP and Matlab. The partial result of this thesis is to verify whether it is possible to use the luminance analyzer for obtaining luminosity curves, it means, if the luminosity curve obtained through luminance analyzer will comply with the curves obtained through a luxmeter. Further work should ascertain the feasibility of acquired photographs lamps from a very close photometric distance could create luminosity curve for any location and distance from the observer to measured lamps.
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Comparison of conventional light bulbs and contemporary light sources in terms of mutual exchange
Kočí, Martin ; Sokanský, Karel (referee) ; Baxant, Petr (advisor)
Term project on comparison of conventional light bulbs and light sources present in terms of mutual compensation marks dissertation, which will pay the same issue. The main pillar of the thesis will be a practical measure, whose structure is indicated below. Semester project constitutes a theoretical basis for a thesis and provides an overall introduction to the issue of compensation light sources. Emphasis is placed on the differences between the light source and the real problems may be encountered by consumers during the transition to another type of light bulbs, respectively. fluorescent lamps. Because consumers often replace the original lamps with compact fluorescent lamps, semester project pays attention to just the differences between ordinary incandescent and energy-saving fluorescent lamps.
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Generators for renewable energy
Prokop, Jan ; Macháček, Jan (referee) ; Baxant, Petr (advisor)
The bachelor thesis deals with the topic of generators, which will use alternative sources of energy instead of fossil fuels. The work is focusing on mechanical energy conversion. Introductory part of the text summarizes the requirements on the generator, properties and parameters of appliances, which will be connected to the generator, and finally the selection of suitable alternative fuels. Main part describes the process of a prototype realization. Individual parts of the device have been manufactured from a simplified technical documentation and sketches in the machine shops of the Secondary School of Electrotechnical Engineering on Trnkova street, and from these parts a functional generator prototype has been assembled. This prototype consists of two separate parts: a propulsion unit and an alternator with accessories, including appliances. On this prototype an efficiency measurement has also been carried out. Furthermore, the work includes animations of device functions created in modeling program SolidWorks 2012. Prototypes are based on a known principle of a steam engine and, at the request of the above-mentioned school, have been adapter into a visual teaching aid. The advantage of those prototypes lies in their inexpensive and simple construction, which utilizes commonly available materials. The device works on maintenance-free principle, there is only the necessity of occasional greasing for a fluent running. In conclusion are briefly reviewed the investment and operating costs of the generator.
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Operational Parameters of LED and their Modelling
Pavelka, Tomáš ; Novák,, Tomáš (referee) ; Gašparovský, Dionýz (referee) ; Baxant, Petr (advisor)
Doctoral thesis deals with parameters of LED light sources and their static and dynamic changes due to variable operational conditions. Firstly there is briefly described the history of light emitting diodes, that brought LED from unintentional observation of luminescence to light source, which is generally used through the whole area of lighting techniques. Thesis focuses on light parameters analysis, which are specific for semiconductor light sources and their mutual relations. These relations in compliance with understanding the principles of light emission in semiconductor light sources enable establishing of basic connections and effects usable for LED behaviour model. Mutual relations of LED parameters and influencing factors are verified by measurement of chosen testing samples. For deeper understanding of diode parameter influencing mechanisms there are analysed current degradation models including degradation of partial components. On the basis of these facts there is created a model of LED luminaire operating with LED parameters together with cooling system that represent the integral part of the luminaire. Impact of supply drivers is also studied, because they are necessary for LED operation. Designed model supports the area of static changes of light parameters, as well as the dynamic changes of output parameters. Presented model is verified by testing measurements at basic operational states and partially outside of the common operational limits. There are also presented the possibilities of real use of the model that involve the evaluation of designed luminaire for specific light sources, searching for optimal operational limits, optimization of luminaire heatsink or using public lighting systems for regulation of electricity grid load fluctuations.
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Utilization biogas for combined heat and power
Fojtík, Martin ; Baxant, Petr (referee) ; Mastný, Petr (advisor)
This bachelor’s thesis is specialized on the solution of actual problems dealing with the exploitation of biological wastes usány combined heat and power. The task is to suggest and valorize the running of combined heat and power system cooperating with a bio-gas station. The first part is devoted to the rise of biogas and biomass which is fit for the production of biogas, further also to the biogas technology. The second part of of this work deals with the principle of combined heat and power, as well as with the comparation of single prime units. The running of biogas combined heat and power is reviewed in the final part.
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Utilization of Heat in Biodegradation Processes as Electricity Savings Potential
Kuběna, Michael ; Šejvl, Radovan (referee) ; Baxant, Petr (advisor)
The present thesis deals with a non-traditional use of biomass–in particular the use of heat generated by the biodegradation processes, involving the degradation of organic substances. The theoretical part of the thesis discusses common uses of biomass in general first, later focusing on the description of biodegradation processes. Various types of bioreactors, in which biodegradation processes take place, are also briefly examined. Moreover, modern systems using this type of heating are described. The practical part focuses on the construction of a bioreactor with the system of heat dissipation. The bioreactor was monitored with temperature sensors to survey the ongoing processes inside the bioreactor and to determine the appropriate time to abstract the heat.
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