National Repository of Grey Literature 33 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Analysis of boundary conditions of ground heat exchangers
Floreková, Skarleta ; Horák, Petr (referee) ; Hirš, Jiří (advisor)
Diplomová práca,, ,,Analysis of boundary conditions of ground heat exchangers,, je primárne zameraná na analýzu okrajových podmienok a hlavných faktorov vplývajúcich na spoľahlivý návrh a prestup tepla plošného zemného výmenníka v oblasti geotermálnych aktivít na kúpeľnom ostrove v Piešťanoch. Posúdenie možných vplyvov na životné prostredie, ako je napríklad vznik tepelných zmien v dôsledku extrakcie tepla vrátane zamŕzania pôdy v okolí potrubia a potenciálneho znečistenia podzemných vôd je taktiež rozoberané. Súčasťou tejto záverečnej práce boli spracované tri numerické analýzy metódou konečných prvkov pomocou softvéru COMSOL Multiphysics 5.6., ktoré sa môžu vyskytnúť v tejto konkrétnej oblasti. Prvá numerická analýza je podrobená štúdii dynamických procesov plošného zemného výmenníka tepla a zeminy nasýtenou vodou pri konštantnej teplotnej okrajovej podmienke pôdy. Dynamický proces zemného výmenníka tepla a nasýteného podložia pri nestálej teplotnej okrajovej podmienke je skúmaný v druhej numerickej analýze. Posledná analýza je vyhotovená na posúdenie prevádzky plošného zemného výmenníka tepla s možnosťou prúdenia podzemnej vody v rovnakej vrstve. Vďaka týmto numerickým štúdiám a výsledkom dynamických tepelných modelov, každá prípadová štúdia obsahuje rozloženie teplôt v zemine, výstupné teploty z výmenníka a vlastný čiastočný záver.
Boundary conditions for the operation of thermal energy distribution
Floreková, Skarleta ; Horák, Petr (referee) ; Hirš, Jiří (advisor)
Bachelor thesis ,,Boundary conditions for the operation of thermal energy distribution” is primarily focused on the analysis of the boundary conditions of balneotherapy operation at Slovak Health Spa Piešťany, a. s.. Due to its content, thesis is structurally divided to the analysis of internal and external boundary conditions. In the part of experimental analysis of internal boundary conditions, the incrust was taken from distribution pipelines of natural healing water and subsequently subjected to chemical analysis and to differential thermal analysis. Partial conclusion of this part lists the recommended material list and procedures, leads to elimination of incrustation form on the surface of materials from natural healing water. The second part is focused on the analysis of thermal fields in the subsoil at Slovak Health Spa Piešťany, a. s. and on usage possibilities of ground energy. For initial state, based on measured temperatures in the drills and project documentations, 2D thermal fields were created, by which it is possible to define zones with high and low potential usage of energy. Documents serve for the design way of energy use and for experimental verification of current state of thermal fields.
Energy use of digestate
Kaška, Zdeněk ; Štelcl, Otakar (referee) ; Baláš, Marek (advisor)
This bachelor thesis deals with the research of biomass in general, its types and processing. Nowadays, biomass appears to be an environmentally and financially acceptable substitute for fossil fuels due to increasingly stringent emissions standards. The second part deals with its particular type, digestate. It is investigated whether the fossil fuel can be replaced or how the energy production process could be changed.
Control and monitoring of a distributed energy generation systems based on renewable sources with storage system
Smugala, Ondrej ; Paar, Martin (referee) ; Vrána, Michal (advisor)
The diploma thesis is dealing with possible approaches to control distributed energy resources and storage systems. One of these approaches is a virtual power plant and its concept is described in the first part of the thesis. The virtual power plant is a controlled system of distributed energy resources, storage systems and controllable loads interconnected via communication network, that can act as a conventional power plant. The theoretical part contains a survey of control system's topologies, a brief summary of available communication infrastructures and standards. The second part of the thesis is focused on the description of operation and control of hybrid system that represents an inseparable component of virtual power plant. A Matlab Simulink model was created for this purpose. A simulation of hybrid inverter's step response is realised to test the operation of the hybrid system and it is compared with the real measurements in the laboratory. A comparison of control approaches of hybrid system implemented on the basis of measurements is also included in this thesis and was published in the scientific paper attached in the appendix.
Energy, economic and environmental analysis of balneotherapy
Miček, Denis ; Horák, Petr (referee) ; Hirš, Jiří (advisor)
The aim of this diploma thesis is to point out European Union´s goals such as low carbon economy, mainly future increasing the use of renewable sources as a potential source of energy. Slovak republic has due to its position in central Europe, rich in natural healing sources of water, which are considered as the most perspective sources of renewable energy in this country. The problem was solved as energy, economic and environmental analysis of Balneotherapy at Slovak Heath Spa Piešťany a.s. This analyzation was provided by real experimental measurement of temperature and flow rate and computational simulation of technological devices in opened natural healing water system. Experimentally measured data were afterwards use for elaboration conceptual design of new technological devices in order to increase efficiency of collection energy from potential renewable source of energy. The research shows that with help of new design technological devices connected to existing ones will be possible to cool down temperature of hot natural healing water from 67 °C to 21 °C, which decrease operation costs of Balneotherapy for more than 1 414 € per day. By Slovak republic entering to European Union it was necessary to accept global goals of low carbon economy. This diploma thesis provides an attention on potential energy in natural healing sources of water as renewable source of energy and helps Slovak Health Spa Piešťany to decrease amount of green-house gases released to atmosphere by efficient increasing the use of energy potential in natural healing source of water.
Electric boiler connection in heat plant for providing ancillary services
Ditrych, Marek ; Příhoda, Martin (referee) ; Wasserbauer, Vojtěch (advisor)
The bachelor thesis deals with using the electric boiler for extension ancillary services in heating plant. The system and support services are described in the thesis, because the ancillary services regulate an energy deflection. The system and ancillary services are described in the thesis. Thanks to these services an energy deflection is regulated. The thesis describes different types of electric boilers and there functions. In the thesis is shown the possible solution of using an electric boiler in heating plant Opatovice. The cable conduction is designed for a power of electric boiler. For this reason, there is calculated the equivalent warming short-circuit current close to the electric boiler.
The energy potential of pools that use geothermal energy as a natural heating source of water
Miček, Denis ; Horák, Petr (referee) ; Hirš, Jiří (advisor)
The aim of this bachelor thesis is to point out European Unions – low carbon economy, based on future using of renewable sources as a potential source of energy. Slovak republic is due to its position in central Europe rich in natural healing sources of water which are considered as the most perspective renewable source in this country. Chosen problem I decide to solve on specific part of Slovak Health Spa Piešťany, especially on Mirror pools located at Balnea Centre on Spa Island. According to measurements of temperature and discharge of natural healing source of water poured out of the Mirror pools obtained from Measurement and Regulation dispatching, I design the system which use this potential energy as a renewable source of heat. The research point out that obtaining energy from renewable sources such as natural healing sources of water are efficient and economical. With the help of designed system I declared the ability of using 98 % of this renewable source of energy, which reduced the costs of operation of the Slovak Health Spa by 216 € per one day. In spite of the fact that European Union accepted low carbon economy, by which countries have to reduce the amount of releasing Green-house gases over the 80 % , the results of this bachelor thesis allows us to reduce amount of gas used nowadays during the operation of Balneological departments and help us to fulfill this European Union idea.
Comparison of Connection Conditions of Photovoltaic Systems in the Czech Republic and the Slovak Republic
Vašica, Radoslav ; Radil, Lukáš (referee) ; Paar, Martin (advisor)
The objective of this work is an analysis and a comparison of legislative conditions of the connection of the photovoltaic power station on the territory of Czech Republic (CR) and Slovak Republic (SR). Presented are the working procedures for connecting of the power station to Distribution Grid (DG) and requirements of individual documents needed for a successful connection. Listed are also circumstances, which are taken into account during the consideration of the influence for connection, for the safe operation of DG. In the work are discussed the ways of support of constructing buildings of the photovoltaic power plant and the principle of repurchasing energy from renewable sources. The other part of work deals about hybrid photovoltaic power stations (HPPS), thus allowing to the power station to save energy into accumulators. There are the composition and principle of operation of the hybrid power stations. The following part deals with options of connectivity with hybrid power station to the DG. There are explained the advantages and disadvantages of connected and unconnected hybrid power plants to the DG.
Influence of RES to power system in Czech Republic
Vánišová, Michaela ; Bartošík, Tomáš (referee) ; Mastný, Petr (advisor)
This text deals with renewable energy sources in terms of working on the electricity network of the Czech Republic. There is the definition of renewable energy sources in the work. Next there are discussed the basic information about connecting to the distribution network. In two parts, there is mentioned and discussed the issue of operation of renewable energy resources and their effects in terms of the electricity network. The last chapter is focused on the possibility of further utilization of renewable energy sources because of their natural energy.
Utilization renewable energy sources inside of EPS Czech Republik
Zmeškal, Pavel ; Procházka, Zdeněk (referee) ; Matoušek, Antonín (advisor)
The purpose of this work was the analysis of current state and further development of renewable energy in the Czech Republic. And next their effects on the electricity system of the Czech Republic. On the basis of established facts has been developed actual state of renewable energy sources. The current situation is only orientation and is still changing at this time. Another objective was to evaluate the various renewable energy sources in terms of their impact on the electricity system and recoverability in the Czech Republic. In more detail were read up the conditions for the wind power plants operation and their connection to the electricity system of Czech Republic. In fine were discuss the impact of renewable energy sources on electricity system and prerequisite for their further development in the Czech Republic.

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