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Development of Simulation Tool for Semi-Hermetic Compressor with the Objectives to Improve Efficiency
Tuhovčák, Ján ; Masaryk, Michal (referee) ; Pavelek, Milan (referee) ; Jícha, Miroslav (advisor)
Compressors are widely used across the all technical fields and current pressure on ecology increases the demand for more effective compressor with economical operation costs. The reasons for inefficiencies must be identified during the development process of a new compressor, where simulation tools might become very useful. There are many different tools for compressor analysis and choosing the right one is mostly dependent on the level of detail that must be analyzed. Models based on energy balance seem to be appropriate when the global parameters of a compressor are demanded. These models offer quick results with reasonable degree of accuracy in terms of basic compressor characteristics. The goal of this thesis is to develop such a simulation tool for a reciprocating compressor. The tool can predict compressor behavior based on compressor dimensions and valve properties. The processes inside the cylinder and heat transfer between the components of a compressor are analyzed using energy balance equation. Simulation tools were verified and experimentally validated using two different types of compressors, therefore they might be used for any reciprocating compressor under some conditions. Mathematical solution was developed in Matlab and therefore it is possible to add new sub-models or to couple the actual model with other simulation tools. This work also contains an analysis of heat transfer models used to predict heat transfer coefficient inside the cylinder and comparison with complex numerical approach. Impact of heat transfer on the compressor efficiency was evaluated too.
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Energy self-sufficient houses
Šošolíková, Jana ; Aigel, Petr (referee) ; Výskala, Miloslav (advisor)
This Bachelor´s thesis deals with the energy self-sufficient houses compared with the low-energy, passive and active construction. The aim of the practical part of the thesis is to assess the operational and investment costs compare with the energy of another buildings and other structures.
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Hydrogen Production from Biomass II
Matějka, Pavel ; Lisý, Martin (referee) ; Houdková, Lucie (advisor)
This master thesis continues the master thesis Výroba vodíku z biomasy. In that work were performed first experiments of hydrogen production from beer less by dark fermentation. Further experiments will continue based on previous experiments. For the energy balance were used results from [1] and data obtained from literature searches, because the results of the experiments were not entirely satisfactory. Energy balance was calculated for a laboratory fermenter to evaluate the efficiency of energy obtainable from the hydrogen produced by fermentation in a dark laboratory conditions. It was compared the yield given in [1] and yield derived from a literature review. The conclusion presents recommendations for further research.
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Energy audit of a residential building
Červenková, Pavla ; Vyhlídalová, Karolína (referee) ; Horák, Petr (advisor)
The subject of the thesis is an energy audit of a residential building, located in the city of Brno - Bystrc. Based on the accompanying documentation was an assessment of the current state of design and subsequent austerity measures. This analysis led to a reduction in energy intensity of buildings in terms of energy, economic and environmental. Also it was carried out Energy Performance Certificate.
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Energy assessment of buildings
Dobrá, Zdena ; Komínek, Petr (referee) ; Hirš, Jiří (advisor)
In the theoretical part of bachelor’s thesis there are basic terms of building energy rating and also the main announcements and guidelines. In the computational part of bachelor’s thesis there are specificated building energy systems, building solution and technical characters of cladding. Also, there are terms as is standardized usage of the building, energy comsumption for individual systems of technical equipment of buildings, draft measures and economical rating. In the Project can be found analysis of PENB, elaboration of sub-section of the energy audit and experimental verification of the building‘s real condition.
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Impact of Fuel Moisture on Parameters of Boiler Regulation
Kiša, Michal ; Baláš, Marek (referee) ; Lisý, Martin (advisor)
The work deals with the verification of functionality of moisture content sensors MCT460-WP from the company Process sensors to measure fuel and products from biomass. The sensor is located on one of the Vyncke company boilers. In the first part of thesis are introduced basic issues of biomass. Thesis also generally describes the control and dynamics behaviour of biomass boilers and the effect of input parameters on the output parameters. The last part deals with comparing and analysing measured values with the calculated values and effects of moisture content changes on the output parameters of the boiler. As the last issue is loaded conceptual design based on on-line moisture sensing and inclusion of auxiliary fuel control into the existing system in order to stabilize the processes in the combustion chamber and output parameters. This should result in lower financial demands during boiler operation.
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Biogas utilization
Trnka, Daniel ; Jedlička, Filip (referee) ; Dvořák, Radek (advisor)
This thesis deals with the use of biogas. It describes biogas from its creation through technology for its production and its final use. Then it generally describes the biogas plants in order to summarize the advantages and disadvantages of biogas production in its current state. The conclusion refers specifically to BGS farm Farma Stonava.
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Coke drying for calcium carbide production
Balko, Michal ; Ucekaj, Vladimír (referee) ; Jegla, Zdeněk (advisor)
The thesis deals with analysis of calcium carbide production process. The aim of the thesis is to identify and design savings resulting from the use of energy contained in flue gas, which is produced during the process. In the first part, history and applications of calcium carbide are presented. The thesis then contains mass and energy balance of calcium carbide production. Balance is related to 1 ton of the product. In conclusion, possibilities of flue gas use for coke drying are proposed. The thesis is based on the information from the calcium carbide factory located in Sundsvall, Sweden.
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Calculation of Energy Performance of Buildings
Hartman, František ; Maurerová, Lenka (referee) ; Hirš, Jiří (advisor)
This bachelor´s thesis in the first part deals with changes of energy assessment of the building by introducing decree 78/2013 and compares it with the previous decree 148/2007. In the next part are specified energy systems entering the calculations and individual computing procedures for determining the energy requirements for individual HVAC systems. In the last part is calculation of the energy performance of the building. As an evaluation mechanism was chosen, the energy performance certificate. There were dealt different variants of calculations in terms of data input. The results are shown in the comparative charts and diagrams.
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