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Ventilation calculations in synchronous machine
Judas, Jan ; Deeb, Ramia (referee) ; Janda, Marcel (advisor)
The aim of the project was to get familiar with the environment of ANSYS CFX, create several models of fans and synchronous machine model in Autodesk inventor, create model of cooling medium flow through the machine with these fans and evaluation of results. Firstly the thesis describes the synchronous machine itself, losses of the machine, the flow of power of synchronous machine and methods of its cooling. Next the thesis describes each kind of heat transfer, laminar and turbulent flow. The thesis also refers of kind of the fans and the program used to calculate the flow Ansys CFX, including the method that Ansys used to calculate. The work describes the individual modification of fans and setting of calculation in ANSYS. Then displays the results of the analysis these fans for different numbers of fan blades and for modification of the fan. Then the thesis analyzes selected modifications due to changing speed. In the last chapter shows the analysis of flow in the machine with three different fans. In particular, there is shown the mass flow rate, pressure and its distribution on areas for evaluation.
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Measurement of the fans characteristic
Coufalík, Martin ; Štětina, Josef (referee) ; Katolický, Jaroslav (advisor)
This bachelor thesis discusses a fan characteristics and their measurement. The aim of this thesis is to compare the results of measurements, which were done in certified laboratory with results of measurements done in alternative measuring stands. In first part of the thesis are described the basic types of fans and inclusion fans in turbo–machines. Furthermore, the thesis deals with a particular fan, which is part of the combustion system of condensing boiler. This fan is also the object of measurement in practical measurements, which were measured as a part of this thesis. This practical part of the thesis includes also analysis of test track, the measurement procedure and all calculations according to ISO ČSN 5801. At first were carried out measurement in certified laboratory and then in three different measuring stands. In conclusion were these results compared with optimal results.
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Noise and vibrations in air-conditioning systems
Libřický, Stanislav ; Hejčík, Jiří (referee) ; Jedelský, Jan (advisor)
This bachelor’s thesis is focused on the sources of noise in air-conditioning equipment and potential noise reduction. The thesis also includes a detailed list of the sources of noise. Thoroughly describes only the main ones, which the fans, aerodynamic noise of air conduit and chillers. The thesis continues with description of methods of the reduction of selected causes of noise in a certain environment. The final part of the bachelor’s thesis includes listing and description of laws and regulations affecting issue of noise in air-conditioning equipment.
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Automatized working place for measuring of airfow parameters
Veis, Samuel ; Huzlík, Rostislav (referee) ; Vlach, Radek (advisor)
This work deals with the design and realization of the workplace for the measurement of ventilation parameters of fans, electric machines and other elements. The thesis contains an extensive research part regarding the air-conditioning issues. In the work was designed a channel for measurement, electronics, sensorics, control algorithm and user application. The workplace was completed and tested.
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Water Cooling System for Formula Engine
Bastl, Ondřej ; Janoušek, Michal (referee) ; Svída, David (advisor)
Diploma thesis is focused on design engine cooling system for formula vehicle type. The aim is introduce with cooling systems of Formula Student/SAE car and competition rules. Based on the famous engine determine the initial conditions for the cooling system. In addition to design all parts of the cooling system and check affordability.
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Aerodynamic noise of computers
Zouhar, Lukáš ; Dušek, Daniel (referee) ; Pellant, Karel (advisor)
This submitted thesis pursues a theme of decreasing the computer noise, especially focusing on the aerodynamic noise of the cooling fans, possibilities of decreasing the noise by fan optimization, using rubber bolsters and sound-isolating layers or construction changes in the very fans and their placing. We shall also aim on the relation between the created noise and the blade shape or rotation speed.
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Development and control of ventilating turbines
Ondra, Martin ; Malach, František (referee) ; Malášek, Jiří (advisor)
This master´s thesis will discuss the mechanical regulation of suction of ventilation turbines. There were designed and described three methods of mechanical regulation in this work. It is a regulation by half-valve, quarter-valve and so-called whirling turbine. Then the calculation of the auxiliary fan was included. The resulting mechanical regulation of this work permit, with high winds, restricting the flow of exhaust air without using electricity. Thanks to this there are saving overall cost of running ventilation turbines and reducing heat loss of industrial and commercial buildings.
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Calculation of induction machine cooling
Záruba, Jan ; Huzlík, Rostislav (referee) ; Janda, Marcel (advisor)
This thesis discusses in the first part of the theoretical concept of flow and cooling induction machine. His behavior , characteristics and possible variants of its calculation . Questions concerning losses from the engine, through the second cooling flow types and finally the calculation. The second part focuses on practical laboratory measurements on a real model. Furthermore, the evaluation of its results. The third part focuses on computer simulation and calculation. The third part is further divided into three phases , where in the first phase devoted to the calculation and simulation flow to the fan motor. In the second stage, the third part deals with the flow in the engine itself , and the third is described and simulated temperature analysis . In the final third phase are subsequently evaluated by computer simulations and compared with practical measurements . This comparison is based on the theory described from the beginning.
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Ventilation of nearly Zero Energy Building
Frčka, Lukáš ; Horák, Petr (referee) ; Rubinová, Olga (advisor)
This diploma thesis is focused on nearly zero energy buildings, which are a mandatory part of construction of the buildings in Czech republic after 2020. It also deals with HVAC and its design as part of these buildings. The theoretical part deals with legal and technical regulations and possible savings in HVAC systems. The computational part is focused on two solution of HVAC systems in given object. The project part is about the given object, which is otevřená zahrada Brno. This building was founded by Nadace Partnerství s.r.o.. This third part of diploma thesis deals with the quality of indoor microclimate and evaluation of the heat recovery system effiency, which is applied in local HVAC unit.
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Proposal to drive the fan impeller for ripening chamber
Dvořáček, Ondřej ; Strecker, Zbyněk (referee) ; Dvořáček, Jiří (advisor)
The Bachelor’s thesis deals with a structural design of proposal to drive the fan impeller with vertical axis of rotation for ripening chamber. The introduction gives a brief description of types, parts and operating principles of air conditioned chambers in meat technology. The second part of this work is focused on the design of belt drive, impeller bearing housing and electric motor layout. Thesis contains fundamental engineering calculations for horizontal and vertical axis positions as well as technical drawings.
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