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The influence of decreasing of impeller diameter, change Q - Y characteristic
Hyriak, Maroš ; Habán, Vladimír (referee) ; Haluza, Miloslav (advisor)
The purpose of the thesis is to familiarize with the fundamental characteristics of ta centrifugal pump while changing geometry of the output section of its impeller trimming. Characteristics of a pump is calculated whilst diameter of the impeller is changed. More specifically, changes in the flow and energy are observed while diameter of the impeller is decreasing. Two possible solutions, approximate and accurate, are offered for both parameters. The thesis suggests that an application of the approximate solution is satisfactory for the flow calculation of the impeller. In contrast, for the energy calculation is the approximate solution sufficient only in case of the slight trimming. Increase in the trimming results in the drop of the hydraulic efficiency and decrease in the accuracy of the results. Consequently, the accurate solution is recommended for the energy calculations. Limitations of the paper may be represented by two facts. First, in comparison with the calculations, results are in reality affected my numerous variables that have not been included in the calculations due to their unpredictability. Second, calculations were based on the several assumptions that are rarely met in the reality. The results of the thesis are applicable in the every-day life when adapting the pump to the customer needs.
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Mixed-flow submersible water pump driven by hydrostatic motor
Para, Marcel ; Ranuša, Matúš (referee) ; Nevrlý, Josef (advisor)
Bachelor thesis solves the problem of a submersible, diagonal hydrostatic pump. This study describes the basic principles of hydraulics and equipment. The possibility of engaging the hydrostatic system as an amphibious vehicle is investigated in the Bachelor thesis. The work is written in cooperation with the sponsor of HYDRAULIC RESEARCH CENTRE, spol. S.r.o., which is part of SPL Holding., Inc.
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The influence of the impeller diameter decreasing on the pumps characteristic
Jelen, Richard ; Haluza, Miloslav (referee) ; Habán, Vladimír (advisor)
This master’s thesis deals with changing the geometry of the output section of the impeller of the radial centrifugal pumps and its influence on the characteristics of the pump. In engineering practice for these radial centrifugal pumps it is possible to change the parameters based on the requirements. This adaptation of parameters is called impeller trimming. Impeller trimming means the reduction of the impeller diameter thereby decreasing the flow, head and efficiency. Existing equations for calculating the changes in the characteristics of the impeller trimming are inaccurate. In this thesis is describes a possible method of putting for the recalculation characteristics of a pump based on the impeller diameter on the available characteristics of pumps.
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Wood-splitting machine
Hoplíček, Štěpán ; Kašpárek, Jaroslav (referee) ; Malášek, Jiří (advisor)
The objectives of bachelor´s thesis are following: Research of known designs of woodsplitting machines, comparison mechanically to hydraulically driven machines, computation and design of own wood-splitting machine. It is designed hydraulic machine with vertical structure. The machine is designed for splitting beech and oak wood with a maximum diameter of 300 mm and length of 1000 mm. It is calculated the maximum splitting force, designed and checked the frame, designed hydraulic circuit and splitting wedge. Bachelor´s thesis contains the assembly drawings of wood-splitting machine and the frame.
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Analysis of the safety requirements of machinery in the European Union and the Eurasian Economic Union
Belov, Vjačeslav ; Blecha, Radim (referee) ; Blecha, Petr (advisor)
The diploma thesis analyzes the European, Czech and Russian standards and requirements for ensuring safety of machinery and methodical process to ensure safety through certification of machinery and centrifugal pumps specially introduced onto the market in the Eurasian Economic Union and the Russian Federation. The first part describes the legislative documents, their properties and the current legislative requirements of EU and EAES. In the second part is an analysis and described comparison of legislative safety requirements of the European Union, the Czech Republic, the Eurasian Economic Union and the Russian Federation. In the third part is described comparison of standards, and were made updates. In the practical part is an analysis of risks pump manufacturer "SIGMA GROUP" according to the requirements EAES and proposed methods for reducing risk prevention. Also in the practical part is analyzed and is created methodical preparation of certification of machinery and pumps placed on the market in the Eurasian Economic Union and the Russian Federation.
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Design concept of the facility for the educational objectives of the boiling crisis
Vojáčková, Jitka ; Škorpík, Jiří (referee) ; Martinec, Jiří (advisor)
This thesis deals with a design concept of the facility for the educational objectives of the boiling crisis. In the first part, the issue of boiling crisis is explained. There are also examples of some experimental facilities in the world. The second part includes design concept of a loop, which is accompanied by designs of individual devices, such as separator, condenser, exchanger, pump, water tank, electric heater. The thesis also states designs of throttle control, temperature control and flow control.
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Utilization of absorption systems in the heating systems
Vidlák, David ; Špiláček, Michal (referee) ; Pospíšil, Jiří (advisor)
Main goal of this work is familiarization with basic features of absorption heat pumps and it’s growing importance on the market. In the first part of the work there is a research for clarifying facts associated with such pumps. In the introduction there are descriptions of basic information from the field of heating industry and its connections to our systems. Next there is a brief analysis of price changes in electricity and heat in the last five years. Main part of the analytical section is a description of the used absorption system. Second part of the work is focused on the calculation of the absorption system itself. First there is calculated internal and external part of the device according to the parameters from GE Power s.r.o. After this step there are parametric studies based on changes of key parameters of the default device for a demonstration of the behavior of a heating pump. In the end of the work there is a integration of the unit into the heating cycle for variations including flue gas condenser and using a cooling water from the turbine condenser.
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Time series analysis of the waste water flow in the pressure sewer
Ambrož, Martin ; Beránek, Josef (referee) ; Ručka, Jan (advisor)
This Bachelor Work is describing the time series analysis of outlet from pressure waste water sewerage and detailed statistic data evaluation in village Štěpánovice. In terms of this Work there were realized detailed evaluation of measured time series of flow by 5 minutes in 4 calendar months. Data evaluation was realized by software programme STATISTICA and MS EXCEL with output to determination of an average and maximal daily flow, maximal and minimal hourly flow and coefficient of non-uniformity. At the same time there was found out with statistic probability number of simultaneous running pumps of pressure sewerage of Štěpánovice village.
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Mobile Wood Splitter
Grác, David ; Kubín, Martin (referee) ; Škopán, Miroslav (advisor)
The aim of my bachelor thesis is design a mobile wooden log splitter according to the basic technical parameters: maximum pressure on the splitting wedge 90 kN, stroke 580 mm, diameter of timber to be cut to 450 mm and its maximum length to 1100 mm. Construction equipment was carried out as vertical.
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Modern Application for Household Heating
Šoupal, Filip ; Brázdil, Marian (referee) ; Lisý, Martin (advisor)
This bachelor thesis is focused on the research of basic sources, methods, and possibilities of heating modern family houses. The thesis is divided into three parts, the first one is focused on the advantages and disadvantages of individual heating sources in the use of renewable and non-renewable energy sources. The next section thoroughly describes and compares the methods of heating considering current emission standards. At the end, there is a technical and economic comparison of the variant of the current gas boiler with the variant of the automatic coal boiler and the modern heat pump. The comparison in interpreted on a model house through performed calculations. For better accuracy, the thesis is enhanced with pictures and tables.
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