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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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Heating and ventilation in the "Doubrava" family house
Jirsová, Tereza ; Pech, Ondřej (referee) ; Charvát, Pavel (advisor)
The diploma thesis is focused on the design of heating and forced ventilation for the project of the family house Doubrava. In the first two chapters is briefly described the theory and there is also described the project of the family house. The next chapter deals with the design of the forced equal pressure ventilation with the heat and moisture recovery. Than the heat loss are calculated according to the norm ČSN EN 12831-1. The next part is focused on the design of heating system and the heat source for the family house Doubrava. There is described detailed design of the floor heating, including necessary calculations, and also the type of the heat pump, as the heat source and source for hot water heating, is chosen. This part also contains a selection of expansion tank and safety valve and approximate calculation of the size of the primar circuit. The last part deals with the possibilities of using renewable energy sources. At the end of the thesis, there are more detailed results of the calculations and the mechanical drawings of individual designs of the ventilation and heating system and also there are tables of the acquisition costs.
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Hot water preparation technology
Štipský, Pavel ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with methods of hot water preparation in households and other non-industrial objects. In first part there are described hot water preparation technologies. In second part there are designed parameters of tank and tankless water heater for family house using standard ČSN 06 0320. Based on these parameters there are chosen water heaters which use different fuels and for them there are calculated their annual operating costs for heating water. At the end of this thesis there is a catalogue containing selected water heating devices and their basic parameters.
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Design of ventilation and cooling system in family house
Bareš, Josef ; Charvát, Pavel (referee) ; Pech, Ondřej (advisor)
The diploma thesis is focused on a ventilation and cooling design of a family house. Author’s idea was to make summary of theoretical information and project documentation for realization (installation) of the ventilation and cooling. Introduction of the house disposition, theoretical research of a current cooling and ventilation options in residential buildings are parts of this thesis. Next it contains thermal load calculation, two designs of a cooling and three designs of a forced ventilation, dimensioning of the pipelines and financial cost comparison of a purchase, assembly, working and service of a designed systems.
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Design of Cooling system in family house
Jirsová, Tereza ; Šíp, Jan (referee) ; Pech, Ondřej (advisor)
The bachelor thesis is focused on the design of cooling system in family house that is intended for potential building-up. The introductory chapter deals with the most common ways of a cooling systems in a family houses, using mainly split and multi-split air conditioning units and heat pumps. The following chapter shortly describes the family house, its orientation on the land and the parameters of the building structure. In the next chapter, there is calculated the heat load for the living room and also there are the results for the other rooms that should be cooled. In the last chapter there are created two different designs of possible ways of cooling and also the financial costs for purchase, assembly, operation and revisions are compared. The first design deals with the installation of two multi-splits. In the second design, the Samsung TDM heat pump was installed. This heat pump is the first in Europe, that can operate with one outdoor unit A2W and also A2A. At the end of this thesis, there are more detailed results of heat load calculations and drawings of individual designs of cooling.
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Design of a weekend house heating
Rajdlík, Lukáš ; Pech, Ondřej (referee) ; Jaroš, Michal (advisor)
This master’s thesis deals with design of different variants of heating and warming of hot service water for holiday building (year-round weekend house, made of bricks). After calculations of the design heat load and heat requirement for heating and warming of hot service water for different types of operations the suitable heat sources are chosen. For heat sources the general design of heating is made. In the end the thesis includes economical analysis for each variant in view of investment and operating costs. The most suitable heat source is chosen from the results of analysis.
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Measurement of capture efficiency of the reinforced slot exhaust system with a workbench
Šíp, Jan ; Zaremba, Matouš (referee) ; Pech, Ondřej (advisor)
The aim of this bachelor thesis is an experimental research on the efficiency of enclose reinforced slot exhaust hood situated over a workbench in the case of different ratios of momentum flux of supplied and the exhausted air flows. Exhaustion efficiency was also measured during the situation when the exhaust hood works as a classical one, i.e. without air supplied by radial slot. The workbench is situated on the upper edge of the exhaust slot opening. For measuring of the exhaustion efficiency was used a tracer gas method, such as trace gas was used carbon dioxide. For data evaluation was used the software Surfer. In the conclusion there are processed measurement uncertainties.
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Methods of reducing the consumption of modern vehicles
Kubeš, Filip ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
This thesis summarizes the basic knowledge of thermodynamics of internal combustion engines. Emphasis was put on engine efficiency and engine cycles, described by theoretical and indicator diagrams. It also introduces classification of engine efficiencies, and their respective definitions. The next section focuses on some systems used in modern vehicles, that improves engine efficiency and reduces fuel consumption. Moreover it includes conceptual solutions, that are in preparation for mass production. The last part of this thesis concentrates on economical driving techniques, and reduction of driving resistance. In conclusion, the thesis shows the direction of next development of automobiles.
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