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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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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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Heating system of a Low-energy house
Jankola, Mario ; Pech, Ondřej (referee) ; Katolický, Jaroslav (advisor)
This master’s thesis pertains to heating practices of low-energy houses using a heat pump (example 1) and low-temperature condensing boiler (example 2). The first part of the work contains calculations of suggested building’s heat efficiency and of under-floor heating. The second part of the work includes estimates of seasonal heating factors for construction with a heat pump. Based on the comparison: both of these heating systems are recommended; the capacity of the warm water container is established; and safety elements are chosen. Furthermore, a system of regulation for warm water heating is determined, and a curve of equithermal regulation for heating is calculated. Both of the recommended heating possibilities include calculations of costs of supplies and manufacturing, as well as blueprints for construction.
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Machining of hard materials
Pech, Ondřej ; Kalivoda, Milan (referee) ; Osička, Karel (advisor)
The objective of this paper is to analyse the issue of machining of hard materials on Swiss-type automatic lathes at Decoleta, a.s. In the form of research, analyses are being done of the materials used, possibilities of the available cutting tools and suitable tooling materials. The current technology used in the production of two different stainless steel elements is further being analysed in detail, including the subsequent suggestion of rationalisation actions. These actions include, mainly, the design of new tools from CBN for both elements, which shall replace the current tools made of sintered carbide, but also reworking of production technology for the Pin on another more suitable type of machine, including a new CNC program and complete drawings.
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Estimation of spray cone angle from atomization nozzles using image based methods
Štafa, Ondřej ; Pech, Ondřej (referee) ; Jedelský, Jan (advisor)
The aim of the bachelor thesis is to estimate spray cone angle. The theoretical part deals with basic principles of atomization, spray structure and spray processing methods including image based methods. The experimental part describes steps of spray cone angle estimation in several specially designed softwares. Advantages and disadvantages of these programmes were evaluated with great emphasis on functionality. Results contain data of spray cone angle values depending on distance between atomization nozzle and spray stream level.
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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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Influence of location of reinforced slot exhaust hood above work table on capture efficiency
Winkler, Martin ; Pech, Ondřej (referee) ; Pavelek, Milan (advisor)
The present thesis explores the reinforced exhaust slot system above work table. Its objective was to measure the capture efficiency in front of the suction extension in various elevation levels of the workbench, taking into consideration four mobility ratios, while in the first case we performed traditional suction. The thesis also presents the results of capture efficiency measurements recorded in figures and tables of measured values. The conclusion analyzes the uncertainty in performed measurements.
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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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Energy simulation of solar collectors operation in a low-energy family house with warm-air heating
Pech, Ondřej ; Charvát, Pavel (referee) ; Jaroš, Michal (advisor)
The thesis deals with energy simulation of a solar energy system in a low-energy family house with warm-air heating. The simulations performed resulted in the assessment of the energy contribution of four solar systems with different types of collectors. The profitability and return of investment for the particular system have been evaluated based on investment costs and the savings gained. The theoretical part includes an introduction to the solar energy field, solar panel systems and the passive house concept. The practical part is devoted to description of the simulated object models as used in the TRNSYS environment, the simulation results evaluation along with the assessment of the economic return on investment. The conclusion recommendations regarding a suitable type and size of the solar panel with respect to the economic criteria chosen are given.
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