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Operational efficiency of photovoltaic generators
Koval, Filip ; Václav, Březina (referee) ; Gregor, Jan (advisor)
Objective of master’s thesis theoretical part is especially to illustrate influence of operation conditions, such as solar radiation, temperature or pollution of photovoltaic generator active area, on load and power characteristics of photovoltaic generator, or more precisely on photovoltaic conversion efficiency. Possible variants of increasing effectivity of using photovoltaic generator are explored, such as solar radiation concentration, photovoltaic generator active area cooling or aplication of optimalization circuit. Pivotal part of master‘s thesis is focused on experimental device practical realisation, concretely type MSQ36-10 photovoltaic generator with oriented concentrators of solar radiation. Practical realisation includes design of master‘s thesis experimental part construction with subsequent design of photovoltaic generator motion cycle necessary for adequate simulation of configuration variants solved using single testing photovoltaic generator. Description of own experimental device construction with list of measuring places used in task takes up. It is used automatic monitoring system working as independent measurement task for required values measuring and consecutive data collecting. It is done in two phases. First phase is measurement of all required values, in second phase measurement with attached optimalization circuit is made. Optimalization circuit sets best working point of photovoltaic generator according to actual working conditions. Master‘s thesis intention is experimental verification of solar radiation concentrators application convenience, orientation of photovoltaic generator or its mutual combination, namely using type MSQ36-10 photovoltaic generator. Objective is evaluation of reached energetic gain for all experimental device layouts in variable operating conditions.
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Study of the intersection in the village of Javornice
Gregor, Jan ; Janda, Michal (referee) ; Kosňovský, Michal (advisor)
The bachelor's thesis deals with the modification of the intersection in the village of Javornice, located in the district of Rychnov nad Kněžnou. In total, three treatment variants are proposed at the same level of processing. The reason for the induced modification is the current opacity of the intersection. Another reason is to meet the requirements of the municipality for the construction of bus stops at the primary school Javornice, modification of the adjacent parking lot and protection of the slopes of a nearby stream against erosion.
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Optimalize Application of Cascade Convection of a Heat Pumps
Hrnčíř, Zdeněk ; Šenk, Josef (referee) ; Gregor, Jan (advisor)
The introductory part of this diploma work contains a basic thought for the application of the heat pumps cascade connection and further I describe its function and define the notion of an optimum middle temperature.Then the direct comparison of two heats pumps cascade connection with an one-stage heat pump is shown there in a concrete example. The main part of the work is aimed to the determination of the most suitable variant for the heating and for the preparation of a hot service water in a benchmark family house. The systems of heatings are provided in options of a low-temperature floor heating and hot-water radiators. Both types of the heat pumps supply the warm to every heating system. It results into four possibles alternatives of the building heating.Besides of the alternatives mentioned above, a new variant of optimalised cascade connection was arisen during this work elaboration . The first stage of this connection which supplies the warm to the floor heating is disconnected out of the heating season and the second stage provides only a hot service water warming. The results of this work showed us that just this variant of a cascade connection causes savings in energy in comparison with an one-stage heat pump. In the conclusion of this work there are discussed the reached results and indicated the possibilities of a practical exploitation.
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The Stirling Thermodynamic Cycle
Macháček, Jan ; Sokanský, Karel (referee) ; Kyncl, Jan (referee) ; Gregor, Jan (advisor)
My doctoral thesis deals with study and analyse of Stirling thermodynamical cycle. Cycle that is composed of two isochoras and two isotherms. I describe functional principle of Stirling engine and all its parts, constructional variations of pistons system and possible engine working modes. Next chapter contains analyse of engine constructional parameters. Measuring of torque and load characteristics, p - V schemes and output work for various engine inputs is part of this analyse. There is composed mathematical engine characterization by means of Schmidt theory in chapter five. Mathematical characterization is consequently applied to engine model. Theoretical analysis and practical measurement were base for concepts, realization and verification of constructional correction. One part of my thesis is attended to design of new lamella for regenerative exchanger. For optimal lamella constructional proportions were used computational algorithm and simulations. There is concept of cogeneration unit with Stirling engine and its benefits check in last chapter. General theoretical and practical analyse of workable Stirling engine is result of my thesis. Analyse in this extent was not nowhere publishing yet. Design of regenerative exchanger lamella is then practical input of my thesis.
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Thermo-electric solar generator
Kočvárek, Ondřej ; Jakubová, Ivana (referee) ; Gregor, Jan (advisor)
The introduction of this work is devoted to the description of physical principals and condtruction of modern semiconductor thermoelectric transformers. This work describes thein basic characters and the most commonly used materials for thein production. Further, it mentions the basic principals and physical effects that describe the thermoelectric conversion of energy and the nondestructive method for establishing the basic material characteristics of thermoelectric transformers. The substantiv part of this work is the measuring of the material’s characteristics of the accessible thermoelectric elements through the medium of experimental measuring network. The optimal construction of thermoelectric solar generators used for individual thermoelectric elements are designed based on the taken measurements and the evaluation of material’s characteristics of the observed thermoelectric elements.
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Model of Bulk Energy Accumulation
Radil, Lukáš ; Barath, Peter (referee) ; Gregor, Jan (advisor)
The purpose of this pursuit is to introduce the reader about the questions of the accumulation of the electric energy and to outline possibilities of its design and what instruments is possible to get it. The other purpose is to inscribe possibilities of today´s attachment of dispersive sources to the net from the sight of the ERU, eventually from the sight of the UCTE. This persuit describes the posibility of the accumulation of adequate dimensions from renewable resources, the modern trends in this area and the prediction of future progress. The two most proper types of the energy accumulation are chosen by the following process with regarding to the optimal resolution of the given questions. The general balance will be ana-lysed by the comparison of their basic parameters. The other point of this pursuit is to try to realize a small model of the accumulation through the hydrogen´s cycle, it comes to that we can develop the efficiency and influence by the help of the electrolyzer and the metalhydride reservoir is realized energy of accumulation . In the conclusion of this pursuit is the appreciation of the whole project with the view of partly economical and especially with the view of the prospective usage into the electric grid
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Feasibility Study of a Large Photovoltaic Power Plant
Krčmář, Vít ; Mendl, Tomáš (referee) ; Gregor, Jan (advisor)
The Bachelor work reffers to a concept of usage possibilities of photo-voltaic powerplant in Nymburk division, Czech Republic. It introduces legislative terms for support, construction and approval procedure of a big photo-voltaic powerplant. It displays usage of economic indexes in feasibility study for three real variants of solar panel and accesories providers.
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Study cross I/20 Nová Hospoda
Gregor, Jan ; Janda, Michal (referee) ; Kosňovský, Michal (advisor)
The diploma thesis deals with the intersection of roads I/20 and II/122. The current intersection is a level crossing and is located in the South Bohemian Region. Three variants of the level crossing with other possible modifications are newly proposed. One variant was elaborated in more detail. The reason for the new proposal is the current increased risk of an accident and the reduced capacity of the current state. Another reason is the strong left turn on the I/20 road in the direction of České Budějovice – Netolice.
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Visualisation of phenomena related to linear programming
Gregor, Jan ; Pergel, Martin (advisor) ; Hladík, Milan (referee)
This thesis introduces design and implementation of scripting language especially focused on visualization of phenomena related to linear programming. We describe a construction of an interpreter and a theory around it. Further we specify what the linear programming is and we show the simplex method. Regarding requierements of manipulation and visualization in vector space of dimension greater than three, there could not be used standard methods, e.g., from computer graphic. That is why there is also a description of modified algorithms used in this cases. Namely projection, transformation and drawing of n-dimensional polyhedron. This thesis also contains examples of scripts showing possibilities of the language and its interpreter.
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Study of the intersection in the village of Javornice
Gregor, Jan ; Janda, Michal (referee) ; Kosňovský, Michal (advisor)
The bachelor's thesis deals with the modification of the intersection in the village of Javornice, located in the district of Rychnov nad Kněžnou. In total, three treatment variants are proposed at the same level of processing. The reason for the induced modification is the current opacity of the intersection. Another reason is to meet the requirements of the municipality for the construction of bus stops at the primary school Javornice, modification of the adjacent parking lot and protection of the slopes of a nearby stream against erosion.
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