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Parametric study of air cooled heat exchanger
Tichý, Marek ; Toman, Filip (referee) ; Baláš, Marek (advisor)
This diploma thesis deals with air-cooled heat exchangers. Firstly, these types of heat exchangers are described theoretically in many different variations. The following part of the diploma thesis is focused on thermohydraulic calculations that aim to determine the resulting heat transfer coefficient and the necessary heat exchange surface. This calculation depends on the chosen piping and its geometry. The design of a specific heat exchanger follows the calculation, which is documented with a projection drawing. In the following section, a parametric study is conducted to investigate the dependence of heat exchanger properties on changes in its geometry.
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Design of concrete elements with FRP reinforcement
Mrkvová, Kateřina ; Lagiň, Juraj (referee) ; Kostiha, Vojtěch (advisor)
This diploma thesis focuses on deflection of reinforced concrete structures with FRP rebar. The thesis presents and compares various approaches on deflection of reinforced concrete structures with steel and FRP rebar based on national and international standards and existing research. The aim of the thesis is to point out differences among the various approaches and present the most suitable one for the particular case. Based on theoretical and experimental results, the goal is to modify one of the existing approaches or present a new method which would correspond with real deflection behaviour of FRP reinforced concrete beam. Simply supported beam with three-point bending was selected as a reference element. Analytical study and numerical analyses by ATENA software are performed. Results of analytical and numerical study are compared to experimental results.
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Effects of hydrogen addition to natural gas on steam boiler operating parameters
Kocman, Lukáš ; Skála, Zdeněk (referee) ; Baláš, Marek (advisor)
This work deals with the influence of hydrogen addition to natural gas on the parameters of steam boiler operation. In the first part of the work, a steam boiler for natural gas is designed, which is then recalculated for natural gas with a volume concentration of hydrogen in the range of 5–50 %. Calculations for individual concentrations were performed in the Mathcad program and were placed in the appendices. Finally, the results are summarized and commented.
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Software support in creating a complex calculation tool
Zich, Jan ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
The master’s thesis is focused on the calculation of a heat exchanger with a crossflowed tube bundle found most in the air-cooled heat exchangers. The knowledge gained from the literature search is used to create libraries, giving a choice of several different methods in the hydraulic and thermal calculation as well as other key areas. These libraries allow their implementation in the comprehensive computational software P.E.C. developed at the Institute of Process Engineering. The thesis includes a verification of the correctness of the library’s calculations with showcased problems as well as 2 parametric studies. These investigate the dependencies of the transverse and longitudinal pitch on some of the process parameters of the heat exchanger.
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Design of a new version of a trolley and docking station for channel racks
Pastrnková, Markéta ; Vepřek, Jiří (referee) ; Vosynek, Petr (advisor)
The master's thesis deals with the analysis of the current version of the trolley and the docking station of the channel racks and the design of modifications. The theoretical part describes the components of the storage channel system. There is also explained principle of pallet storage in this part. In the following chapter, several variants of the design of the lifting mechanism of the lifting platform are elaborated. The work also presents static structural analysis of the current version of the trolley and docking station, parametric study and topological optimization of one of the components. Static structural analyzes were partially solved in the finite element software RFEM by Dlubal Software s.r.o company, and mainly in the software ANSYS Workbench 2020 R2 by ANSYS, Inc. company.
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Calculation program for heat exchanger design
Švec, Dalibor ; Baláš, Marek (referee) ; Pospíšil, Jiří (advisor)
The diploma thesis is focused on creating a calculation software for designing heat exchanger. The software will not calculate one single heat exchanger but will recommend all heat exchangers which meet the requirements. Then, user can decide which heat exchanger is best suited for the specific application and make a comprehensive calculation. Part of the diploma thesis is to verify correctness of the software and make a parametric studies. Parametric studies will be focused on baffle cut, baffle spacing, tube pitch, and tube thickness and its effect on heat transfer and pressure drop.
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Design of concrete structures reinforced with non-metallic FRP reinforcement
Golisová, Michaela ; Januš, Ondřej (referee) ; Kostiha, Vojtěch (advisor)
This diploma thesis investigates the design of concrete structures reinforced with non-metallic FRP reinforcement with a focus on solving the bearing capacity in extrusion. The work is divided into a theoretical and a practical part. The theoretical part begins with an introduction to FRP reinforcement and a description of shear stress. The following is an introduction to current approaches dealing with this issue. In the practical part, in connection with these regulations, parametric studies are developed to compare the influence of individual input parameters and selected regulations. The last part is dedicated to the design and nonlinear analysis performed in the ATENA software.
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Proposal of topology of piezoceramic composite sensor
Dostal, Vojtěch ; Ševeček, Oldřich (referee) ; Majer, Zdeněk (advisor)
This master thesis deals with design and numerical modelling of piezoceramic sensor, which is placed on a rail, in order to generate electrical energy, which can be used for wireless monitoring of railway traffic and to monitor the condition of the railway. The thesis is divided into three parts. Theoretically background of piezoelectric energy harvesting is described in first part, where some previous application of piezoelectric generator in railway area are shown. In the second part, parametric analysis of numerical model is performed, which directly leads to finding best location on a rail, where piezoelectric generator should be placed. For this analysis the homogenized model of MFC sensor was used. Results of the numerical model were then compared with the results of the conducted experiment. The third part presented own design of piezoceramic sensor, which is placed onto most suitable location on a rail. Results from numerical analysis shown eligibility of using piezoceramic sensor to monitor the railway traffic.
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Biomass gasification model
Studený, Vojtěch ; Baláš, Marek (referee) ; Milčák, Pavel (advisor)
Mathematical models of gasification are suitable for predicting gas composition and its properties. The aim of the diploma thesis is to compile a mathematical model for biomass gasification. The first part deals with the description of gasification and the technologies used. Theoretical part consists of the search of modeling methods. Other theoretical part is devoted to the description of the model and equations presented in the thesis. Part of the assignment is a parametric study that shows changes in gas production and its properties when changing the parameters. Finally, the model is compared with the data obtained in the experiment on the fluid reactor biofluid 2.
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