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Unconventional methods of increasing power of internal combustion engines
Smrček, Martin ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
Nowadays the most common method for increasing the performance of internal combustion engines are most used chip tuning or expanding presence of ethanol. The aim of this thesis is to perform a basic analysis of the thermodynamic cycle internal combustion engines, various effects on the thermodynamic efficiency and performance and analyze various methods to additionally increase the performance of the engine. The following are the principles of the analyzed methods, advantages and disadvantages, compared to the methods used in terms of use, price / performance ratio, as well as practical application examples.
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Optical measurement of liquid surface tension
Malá, Kateřina ; Pech, Ondřej (referee) ; Malý, Milan (advisor)
This bachelor thesis explores the topic of measuring surface tension of liquids. The theoretical section explains the basic principles as well as possibilities of application of several measuring methods. In the next part, the most suitable method is selected in terms of ease of use, accuracy and purchase cost. The pendent drop method has been found to fit these criteria. The experimental section of the thesis describes the measuring apparatus and the analytic tool used. The results comprise an analysis of the factors which may affect the measurement precision as well as a comparison of an automatic and a manual analysis, and a reference measurement that confirms the aperture as efficient at measuring surface tension of liquids.
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Design of a space heating system and hot water heating for family guest-house
Nykl, František ; Pech, Ondřej (referee) ; Katolický, Jaroslav (advisor)
This diploma thesis describes the detailed design of heating and hot water heating for a family quest-house. At first the reader is introduced to the designed building, its design and construction elements. The thesis presents the calculation procedure and design of the heating system. This consists of designing radiators, the heat source, the circulating pumps, regulations of the heating system and the design of its security elements. The thesis also describes the design of the heat exchanger for hot water and security. In conclusion, an evaluation of operating costs with the recommended solution for their reduction. The thesis also includes drawing documentation of structural drawings, heating and unrolled schema that is mentioned in the attachment.
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Earth heat sources for heat pumps – vertical bored collectors
Pech, Ondřej ; Štětina, Josef (referee) ; Jaroš, Michal (advisor)
This bachelor’s thesis deal with utilization of vertical bored collectors like source heat for heat pumps. The theoretic part contains an introduction with history and principle of heat pumps, operational modes, explanation of heating factor, low potential heat sources, types of vertical collectors, development of drill hole, materials of vertical collectors, their dimensioning, installing, operational problems, environmentalism of operational and their preferences and deficiencies. The practical part is dedicated to comparing approximate investment and operating costs for heating and hot service water preparing for designed house of five types source of heat.
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Heating, ventilating and air-conditioning in energy-efficient buildings
Vogel, Jan ; Pech, Ondřej (referee) ; Charvát, Pavel (advisor)
The bachelor’s thesis deals with heating, ventilating and air-conditioning in energy-efficient buildings. The first part of the thesis provides an overview of suitable met-hods of heating, ventilating and air-conditioning for energy-efficient buildings. The second part contains the evaluation of suitability of these methods in newly built fami-ly houses and apartment buildings and also in building energy retrofits.
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Trends in the development of hybrid vehicles
Šebesta, Filip ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
This bachelor is aimed on making a survey of modern electric drives and hybrid cars. For each kind of drive out their properties, structural design, usage, advantages and disadvantages. It also describes new trends and technology of hybrid vehicles. In conclusion, the comparison of the advantages and disadvantages of hybrid drives and internal combustion engines. Assessment of the availability and economy of operation.
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Experimental study of turbulence downstream of a wire mesh
Uřičář, Filip ; Pech, Ondřej (referee) ; Lízal, František (advisor)
This bachelor's thesis is focused on the convection behind a mesh grid and consists of three parts. The first part presents current of knowledge in the generation and damping of the turbulence by the mesh grid. The second part presents experimental results of the measurement. The third part of the thesis is focused on experimental data processing and analysis. The method of hot wire anemometry was chosen for the speed measurement, namely Streamline by Dantec and for experimental purposes track had been constructed in the Laboratory of Ventilation Systems at the Faculty of Mechanical Engineering, Brno University of Technology. Based on the knowledge gained from the study of literature and the consultations, calculations and technical possibilities of the instruments used, grid measurements were performed for convection from 150 to 300 liters per minute, which was sufficient to generate turbulent flow. For the experiment, a solid grid through which the fluid flows has been chosen, due to feasibility of the experiment.
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The whirlpool design
Havlíček, Matěj ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
The bachelor thesis is conceived as a research of the availability of home whirlpools, their design and also as an analysis of the cost of production of the whirlpool. In the first part, there is an introduction of components and their variants for the whirlpool. The second part is focused on the author's design and the choice of components for the designed whirlpool. In conclusion, there is an expected price of the whirlpool and a comparison between buying a whirlpool or own homemade. The work contains a design in a program Autodesk Inventor.
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Design of a space and DHW heating system for a detached dwelling
Záboj, Jakub ; Pech, Ondřej (referee) ; Charvát, Pavel (advisor)
The thesis aims to propose a system for heating and hot water for a family house, according to drawings supplied by the building architect. At the request of the investor as the primary object will be considered a variant of underfloor heating. For comparing the heat loss, economic and possibly to State subsidies system selected will be processed by an alternative option to the ventilation air heating. Underfloor heating and hot air are among the low-temperature heating system, which can use low temperature heat sources, such as heat pumps. This assumption corresponds to investor requests, the source of heat in a family house with a heat pump and gas boiler. For hot water will be used as an alternative to a fireplace in the living room. To use the results of the thesis is to calculate the heat loss and heat, according to current standards include design and hot-water heating system including hot-drawing documentation. Finally, the economic evaluation of different alternatives in terms of investment and operating costs.
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