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Simplified design of heat exchangers using MS Excel
Konečný, Ondřej ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
This bachelor thesis deals in the first part with the research, where the types of heat exchangers are briefly described. The next part contains the basic equations for the calculation of heat exchangers as well as different approaches to the calculation of these devices. The practical part of this thesis focused on the development of the calculation tool, the corresponding manual and the functionality checking with examples.
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Study of the technological heat utilization system in the waste gas-to-energy process
Beneš, Daniel ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This diploma thesis deals with the conceptual design of systems for the technological use of heat in "waste gas-to-energy" (WGtE) industrial processes. In the beginning of the work, familiarization with the WGtE processes is carried out. Their general concept, equipment composition and possible design of exchangers within this system are presented. In the next part of the thesis, a specific industrial case of the WGtE process is presented, on which the analytical method for the design of new units is subsequently presented and assessed. The following is a part of the work that is devoted to the creation of a graphic-calculation tool for the conceptual design of the technological heat utilization system using the analytical method of calculation. At the end of the thesis, this tool is applied to the cases of two WGtE processes for the conceptual design of the optimal technical-economic solution of the technological heat utilization system of these processes, and the achieved optimization results are subsequently evaluated.
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Design calculation of heat exchanger for cooling of aggressive substances
Kůra, Tomáš ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
This thesis focuses on the design of a coaxial tube in tube heat exchanger. First, the existing methods of cooling of aggressive substances are presented. Subsequently, the compatibility of the heat exchanger materials with substances used in the semiconductor industry is addressed and the PFA polymer is presented in detail as a suitable material. The paper further explains heat transfer, both in general and specifically in heat exchangers. Not only the relationships commonly used in heat exchanger design are presented, but also equations for coaxial heat exchangers. The individual empirical equations are compared with measured data, and on this basis, the most appropriate relations are chosen to describe the processes in the exchanger under investigation. Then, the work describes the operation of the developed program in VBA, which includes thermal and hydraulic calculations and strength control.
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Calculations of steam condensers
Mifek, Roman ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This thesis deals with the calculation procedures for determining the heat transfer coefficient for steam condensers. The first section provides a basic overview for industrial steam condensers and possible procedure for selecting the appropriate type of tube condenser. The next section describes the types of condensation and equations for determining the heat transfer coefficient for various geometries of tubular condensers. In the final section there is performed practical calculation of condenser in Maple software using the above relations. The results obtained in this calculation are compared with the results obtained by professional computational software Chemcad and HTRI.
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Study of potential of heat transfer enhancement in process plant
Němeček, Zbyněk ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
This diploma thesis is a study of the potential of heat transfer enhancement in the process of hydrogenation refining of oil. The simulation of the process and the heat-hydraulic analysis of the heat exchanger network are performed using the software tools. Based on the obtained results and the results of the optimization study, a new heat exchanger is placed in the process and its parameters are subject to further calculations. The aim is to study the possibilities of heat transfer enhancement for the newly used heat exchanger and to discuss aspects connected with the use of selected software.
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Analysis of heat exchanger
Nosek, Miroslav ; Kilkovský, Bohuslav (referee) ; Jegla, Zdeněk (advisor)
The diploma thesis is focusing on research of possible damage mechanism of U-tubes in a heat exchanger placed within a gas waste incinerator unit in a factory dealing with chemicals manufacturing. In the first phase of the research, in which a thermo – hydraulic calculation is being made, a specialized software tool HTRI Xchanger Suite® v6.00 is used. Using the software it is possible to simulate certain operational conditions in which the heat exchanger operates. The output from the first phase of the solution is to obtain a set of temperatures of the tube material throughout the length of the tubes. These data are consequently used in the second phase of the analysis. The second phase of the analysis is dealing with thermal lenght dilatation differences assessment between tubes in the tube bundle as a predected reason of oversize tension formed in tube material and damage following afterwards. Conclusions of the calculation made in the second phase of the analysis are then checked by calculation via ANSYS Workbench 11.
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Analysis of heat exchanger troubles
Bartošek, Nikola ; Jegla, Zdeněk (referee) ; Kilkovský, Bohuslav (advisor)
The master thesis is focused on analysis of specific cross-flow in-line tube bundle heat exchanger which deals with significant operational problems. Thermal, hydraulic and vibration calculation analysis of selected parts of the heat exchanger is performed based on CFD flow distribution results. Calculation is performed by using Maple software. Thermal and hydraulic calculations are compared with results obtained by commercial software HTRI.
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Hydrodynamic analysis of basic equipment in units for the thermal processing of wastes
Říha, Kamil ; Kilkovský, Bohuslav (referee) ; Pařízek, Tomáš (advisor)
Thermal processing of wastes is a metod, when during combustion occur reduction of wastes till 10% previous volume. The main advantage of this method is possibility to heat utilization for heat and electric production. Through thermic process develops range of pollutants (NOx, CO, SO2, HCl, HF, PCDD/F) that had to be remove from off-gas or reduced to enviromental values in agreement with laws in force [16]. For this purpose are combustion units equip with range of devices for removing this pollutans. The main task of this diploma thesis is selectoin of ctirical device in term of pressure drops. The value of pressure drop stands significant part in proposition of efficiecy off-gas fan. In increase or decrease total pressure drop consumption of electrical energy of off-gas fan is rising or going down. Change of consumption in total classification is projecting in energy utilization rate of waste where is determinate if it stands of energy utilizatoin or just incineration. In first part of diploma thesis are described in detail availability methods of off-gas cleaning where is described their principle, advanteges, disadvatages and comparison of effectivity. In second part of diploma thesis is made example model about influnce technology on value of total pressure drop. There were chosen two technologies for removing dioxins (technology of catalytic filtration REMEDIA and DeNox/DeDiox). For both technologies were made detailed analysis of pressure drops single components of these technologies. Attainment results were compared and rated with one another. For analysis these two methods were designed mathematical process in software Maple 9.5.
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