National Repository of Grey Literature 43 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Analysis of HVAC systems of a low-energy house
Urban, Erik ; Bahr,, Josef (referee) ; Šikula, Ondřej (advisor)
In the first part, the diploma thesis addresses the issue of comparing individual HVAC systems for family houses. The second part is an experimental measurement of HVAC systems of a low-energy family house. The third part deals with the current state of heating and air conditioning of the family house, together with a certificate of energy performance of buildings. The diploma thesis is more focused on the experimental part.
Mathematical Models for Analytical Calculation of Energypiles
Oravec, Jakub ; Šikula, Ondřej
A current trend is to reduce the energy performance of buildings by using alternative sources for heating and cooling. One of the most promising, and so far unprecedented sources of heating and cooling, is the use of energy from the earth using the thermally-activated foundation piles of a building, the so-called energy piles. The paper deals with an overview and comparison of computer-aided analytical models of energy piles. The individual analytical models are compared (categorized) from the point of view of their physical complexity, computational costs, and thus their usability for the purpose of optimizing energy-pile equipment or assessing the long-term energy efficiency of an energy pile field. Selected mathematical models were algorithmized, and the results obtained were compared with a more robust numerical solution performed using CalA 4 software.
Simulation of thermally activated foundation structures of buildings
Sliva, Matěj ; Adam, Pavel (referee) ; Šikula, Ondřej (advisor)
Diploma thesis deals with geothermal foundations. The aim of the thesis is to find optimal way of pipe winding for heat-carrying liquid in foundation piles. The problem is solved by CFD simulations in ANSYS Fluent. Determinative parameters like the pressure loss, heat fluxes and U-value in one pile circuit with two ways of pipe installations – Single coil, where reverse pipe is led in the middle of pile and Duplex Coil with reverse pipe in spiral shape are observed.
Ventilation of a primary school
Urban, Erik ; Bahr,, Josef (referee) ; Šikula, Ondřej (advisor)
The bachelor thesis addresses the first part to the microclimate in school buildings. The second part concerns the proposals of forced equal pressure ventilation of single-storey primary school. In the third part, the technical documentation of the proposed ventilation equipment is processed.
PCM-based heat and cold storage
Němec, Lukáš ; Ostrý, Milan (referee) ; Šikula, Ondřej (advisor)
In the first part of the bachelor thesis I will deal with the accumulation of heat and cold using materials with phase change and also the design of a PCM storage tank. The aim of my effort is to design the most ideal spacing of tubes in a given tank, so as to achieve the greatest possible heat capacity. I performed simulation experiments in CalA 4.0. The second part is computational, where I focus on the design of heating in the pension. I solve heating with an air-to-water heat pump. I designed solar collectors for hot water heating. The last and third part is the project, which contains the project documentation together with the technical report.
Analysis and optimization of thermal behavior of buildings
Nováková, Iva ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
The diploma thesis with research of efficiency of renewable and low-potential energy sources of buildings. It is available on numerical simulations for sharing office and heating and cooling system buildings in DesignBuilder. There are various energy sources and ways of controlling heating and cooling. The results are evaluated in terms of time, after the expected compromises in the building, in terms of energy consumption and its price.
Industrial hall cooling
Sliva, Matěj ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
This bachelor thesis deals with the issue of working conditions in heat in the workplace of the powder coating plant production line, especially summer operation. The largest heat source here is from the surface. The aim is to optimize measures to reduce heat stress for workers. This is solved by CFD simulations in Designbuilder. It is expected that this will be the first way in which it will evolve in the future. Each simulation focuses on alternative cooling methods or combinations thereof. The work environment requirements for each simulation are evaluated by the WBGT indicator for hot operations.
Ventilation and cooling of an office building
Čtvrtečka, Václav ; Adam, Pavel (referee) ; Šikula, Ondřej (advisor)
My bachelor thesis deals with a complex proposal of forced ventilation and cooling of an office building. The aim of the work is to provide a quality and functional system of ventilation and cooling equipment to ensure optimal microclimate inside the building. The theoretical part deals with cooling systems and their use in detail.
Dynamics of heating surfaces behavior
Oravec, Jakub ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
The diploma thesis is focused on the research of dynamics of selected heating surfaces behavior. The aim of the thesis is to determine the dynamics of heating and cooling and to determine the effect of these characteristics on energy consumption of the building. The project part deals with the design of a heating solution for a residential building in three variants. An Energetic simulation is made for the designed variants, that compares the consumption of thermal energy during one year. The next simulation research the dynamics of selected large-scale heating surfaces. For each construction, nonstationary models of heating up and cooling were made, which are compared in terms of the thermal inertia.
Simplified computer models of elements for an air distribution
Mishuk, Aliaksandra ; Gebauer, Günter (referee) ; Šikula, Ondřej (advisor)
The goal of this master thesis is to create a simplified model of an actual swirl diffuser using CFD (Computational Fluid Dynamics) simulation, so that it would be easy to calculate (would have a simple geometry, a proper mesh and would enable quick definition of the model’s boundary conditions) and would also create an airflow pattern in space as close to reality as possible. In the process a CFD model with a certain geometry was created. Subsequently, various model settings were tested. Calculation results were compared with the results of the experimental measurement done using the PIV method.

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