National Repository of Grey Literature 81 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Research on Effective Methods of Exhausting
Pech, Ondřej ; Kratochvíl, Zdeněk (referee) ; Černecký,, Jozef (referee) ; Pavelek, Milan (advisor)
Many production technologies generate a variety of gas pollutants, which are unhealthy. The aim is therefore to minimize the content of such gas pollutants in the work environment. The highest capture efficiency of gas pollutants offers the local exhausting. Its disadvantage is the necessity to surround the source of pollutants, or to be as close as possible which is usually not technically or technologically possible. A possible alternative is to use a reinforced exhaust system that achieves greater capture distances. In the initial stage of the solution of the dissertation, a review of reinforced exhaust systems was carried out. Further, an existing measurement system was modified for measurements with the partition above the exhaust slot and the measurement system was partially automated. In order to investigate the case with pollutants having a lower density than the air, the workbench - the partition was moved above the exhaust slot. Based on of the literature review, a modification of the reinforced slot exhaust system was proposed. The modification consisted in the adjustment of the air inlet adjustment where a set of holes and a tube assembly were used instead of the slot. Such setup allowed for higher flow turbulence and thus for an increased exhaust efficiency. Subsequently, the inlet streams from the slot, holes and tubes were visualized by the smoke method. Further measurements were carried out by the tracer gas method for the determination of the exhaust efficiency. Measurements of velocity fields in front of the proposed configurations of the reinforced slot exhaust hood were also carried out. In conclusion, an energy performance assessment was carried out by means of the measurement of the electric power input to the fans with the determination of the electric loss power.
Design of Cooling system in apartment
Gebauer, Ondřej ; Jaroš, Michal (referee) ; Pech, Ondřej (advisor)
Bachelor thesis is consistsing of a part of the thesis, which deals with the distribution of used cooling systems and a description of how they work. The following section attend with the description of the flat for which cooling is envisaged. The third part deals with the calculation of heat gains derived from people, electrical appliances, flow from other rooms and solar radiation. The last section show three variants of cooling, their comparison and evaluation.
Design of Cooling and ventilation system in family house
Bíza, Michal ; Charvát, Pavel (referee) ; Pech, Ondřej (advisor)
The diploma thesis is focused on the design of ventilation and cooling for the family house. The first part of the thesis deals with possibilities of ventilation and cooling, air ducts and their components and selected ventilation units. The next part deals with the analysis of air-conditioning routes, their dimensions and pressure losses. Then the heat gain is determined, and cooling is proposed. The last part deals with the comparison of financial costs for purchase of all components for ventilation and cooling, assembly, installation and operating costs. The enclosed drawings and item lists are at the end of the thesis.
Emission standards for IC-engine vehicles and emission test systems
Náhlík, Tomáš ; Pech, Ondřej (referee) ; Štětina, Josef (advisor)
This bachelor thesis deals with the issue of emission standards and emission measurements with contemporary motor vehicles. Introduction acquaints reader with the reason it is actually necessary to address this issue and what are the main negative components of emissions by motor vehicles. Effects of such components on human health and the environment are also included. List of historic and of course current emission standards both from within the European Union and globally follows. The thesis concludes with an overview of analytic methods, tests and test techniques focused on emissions by motor vehicles.
Design of ventilation system in residental spaces
Břenek, Václav ; Charvát, Pavel (referee) ; Pech, Ondřej (advisor)
This bachelor thesis deals with design of a ventilation system with recuperation in a chosen flat. The introductory chapter focuses on research of recuperation units and their parts. In the second chapter the required amount of ventilation air is determined, and three recuperation units are selected. In the third chapter the pipeline system is designed for the selected units, which is subjected to a control calculation of pressure losses. The last chapter compares the costs of implementation and operation of selected units.
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.
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.
Energy retrofit of a stand-alone house
Stupka, Jaroslav ; Pech, Ondřej (referee) ; Charvát, Pavel (advisor)
The aim of the master’s thesis was to design heating, ventilation and cooling systems and to evaluate possibility of using renewable sources in case of a reconstructed two-storey family house. Air to water heat pump and floor system were designed to ensure both heating and cooling supply in the building. A heat recovery ventilation system was proposed. Gains of electrical energy from photovoltaic array were calculated and then possibility of coverage the heat pump consumption was evaluated. The thesis contains required calculations including building heat losses, heat gains, air exchange rates and the dimensioning of all mentioned systems. Technical drawing is also comprised.
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.
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.

National Repository of Grey Literature : 81 records found   1 - 10nextend  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.