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Heat transfer in solar energy equipment
Hylas, Martin ; Jegla, Zdeněk (referee) ; Babička Fialová, Dominika (advisor)
Photovoltaic panels are an efficient device for converting solar energy when exposed to high solar radiation intensity, which is, however, associated with a high ambient temperature. The high operating temperature of a photovoltaic panel has a negative effect on the efficiency and lifetime of the device. The first part of this thesis presents the current state of the art in the field of active and passive cooling methods for photovoltaic panels. The main metrics for evaluating the effectiveness of cooling systems are the cooling rate and the power gain of the photovoltaic module. The research shows that significant reduction of temperature effects can be achieved by support systems, but based on the experimental work to date there is no unified view on the applicability of the cooling devices in practice. Investment and operating costs are a significant barrier to the use of these systems by the general public. A possible solution to efficiently generate electricity and utilise otherwise wasted heat is to combine the functions of photovoltaic panels and solar thermal collectors into hybrid photovoltaic-thermal collectors. The tubular distribution system is an integral part of these installations. From a design point of view, these are simple systems, naturally subject to uneven distribution of the working medium, which results in a decrease in the efficiency of the entire device. In the second part of the thesis, the functionality of analytical models to predict the distribution of the working medium in a K-type distribution system is verified. The results of the comparison of predicted data with experimentally measured values show that the predictive ability of the analytical models is strongly dependent on the method of determining the value of hydraulic resistance (local losses).
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Analysis of the technical designs of lightning protection for a commercial building with PV power plant
Paclík, Patrik ; Bátora, Branislav (referee) ; Ptáček, Michal (advisor)
The main objective of the thesis is the issue of lightning and surge protection and demonstration of its practical application at the level of a fictitious object. In the context of this, a search of the currently valid standards and legislation is carried out and a basic list of requirements for the creation of related project documentation is given a key complement of the thesis is the synthesis of lightning and surge protection with the protection of photovoltaic panels located on the roof structure of the building, where the issue of possible damage after lightning strike is addressed and the risks with external and internal protection are analysed. The thesis also includes an evaluation of possible collision in the application of lighting protection and photovoltaic panels, as well as the prevention of the spread of a possible fire from the roof to the object. Three different technical designs of external lightning protection are compared in terms of aesthetics, financial costs and practicality.
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Detached house in Boleradicích
Pospíšilová, Kateřina ; Jelínek, Petr (referee) ; Dohnal, Jakub (advisor)
The aim of this bachelor’s thesis is to design a nearly zero energy detached house for a family of four. The first part of the thesis is architectural and structural design, including fire safety solution and building physics, which is focusing on acoustic assessment, thermal assessment, and assessment of daylight. The second part is design of building services and design of heating system for a documentation for building permit. The building is located on gently sloping plot in a Boleradice in South Moravia. It has two storeys and gable roof. There is a separate one-storey garage with flat green roof on the plot. The building is based on a reinforced cocreate foundation slab on gravel of foam glass. The external walls are made from sand-lime blocks with ETICS of expanded polystyrene with graphite. The floor structure is a cast-in-place reinforced concrete slab. Gable roof is design like a warm roof, with load bearing structure from timber. The ground floor includes a walk-in wardrobe, a study, a utility room, a bathroom, a pantry, a living room open to a kitchen with access to the deck. The private zone, located on the first floor, consists of a master bedroom, children’s bedrooms, a bathroom, a separate toilet, and walk-in wardrobes. In the project, the design includes mechanic ventilation with heat recovery, rainwater management system, sanitary installation, electric installations, and a photovoltaic system as part of design conception of building services. Heating and domestic hot water treatment are provided by an air-water heat pump. Distribution of heat is provided by floor heating. The project also includes the Energy Performance Certificate.
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Photovoltaic laptop charger with wireless connectivity
Komár, Josef ; Kratochvíl, Tomáš (referee) ; Kufa, Jan (advisor)
This thesis deals with the design and construction of a photovoltaic charger designed primarily for a laptop. The solar charge controller works using the MPPT (Maximum Power Point Tracking) principle and is controlled by a ESP32 microcontroller. The control algorithm constantly searches for the maximum power point, thus achieving the maximum possible power and efficiency of the PV panel. The produced energy is then stored in the battery system, which has a BMS including protections and cell balancers. The charger includes an adjustable 18 – 22 V output for powering a laptop computer and 5 V output for powering devices via USB. All important parameters (voltages, currents and powers) are sent wirelessly by the charger via Wi-Fi interface.
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Design of a photovoltaic power plant for a family house in Opava region
Pekárek, Marek ; Jandová, Kristýna (referee) ; Vaněk, Jiří (advisor)
The bachelor thesis covers the design of a photovoltaic power plant with battery storage for a family house. In the theoretical part is mentioned principles of photovoltaic effect and the function of photovoltaic cells. The work deals with the description of the photovoltaic panels and entire systems of photovoltaic power plant used nowadays. Theses includes informations on legislative conditions and available subsidies related to the installation of photovoltaic power plants in the Czech Republic. In next part of the thesis, I focus on the design of a photovoltaic power plant for a selected family house with a measured annual energy consumption. The system design methodology includes calculation of the required power output of the plant, selection of the appropriate panel placement, component selection, and design of electrical wiring. The work also includes an economic analysis and a calculation of the return on investment, considering the available energy products from energy suppliers in the Czech Republic.
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Solar power inverter
Gottwald, Petr ; Boušek, Jaroslav (referee) ; Pavlík, Michal (advisor)
Tato práce se zabývá návrhem výkonového měniče určeného pro použití ve fotovoltaických systémech. Klíčovým je použití programovatelného hradlového pole (FPGA) pro realizaci řídicích funkcí. Do detailu jsou diskutovány aspekty návrhu spínaných měničů a na základě takto získaných poznatků je zkonstruován funkční vzorek měniče.
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Draft mix for network independence
Horváth, Radovan ; Špiláček, Michal (referee) ; Pospíšil, Jiří (advisor)
The aim of this diploma thesis is the development of research on the topic of the draft mix for network independence. Next is the outline the various design solutions of the battery systems for accumulation electric energy and balance model energy supply system for the selected object. The practical part of diploma thesis deals with necessary resources and the size of batteries for autonomous operation during the summer months and also implements technical and economic studies aimed at finding cost-effective solutions. The work is divided into 6 chapters that contain 16 tables and 18 figures. Diploma thesis brings an option to configure a photovoltaic system and also describes the features, functions and the choice between the most used technologies. Evaluation of results of theoretical methods are described in the final part.
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Monitoring of photovoltaic power plant Brumovice
Šumberák, David ; Knobloch, Jan (referee) ; Pochyla, Martin (advisor)
The Bachelor thesis deals with monitoring of photovoltaic power plant with nominal performance 3,075 MW. The first part describes the principle of photovoltaic conversion of solar energy, summarizes the principles of the photovoltaic phenomena, current trends and promising options. The following part of thesis an introduction to photovoltaic power plant in Brumovice, it is her monitoring and determining the efficiency. In the last part metod of calculating return power plant is describes.
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Analysis of the legitimacy of use of solar trackers for photovoltaic systems in a given area
Hořava, Pavel ; Radil, Lukáš (referee) ; Ptáček, Michal (advisor)
This bachelor’s thesis deals with the Analysis of justifiability of use of solar trackers for photovoltaic systems in given locality. The principle of the photovoltaic transformation, kinds of photovoltaic panels, legislation and a suitability of the Czech republic for photovoltaic systems are roughly characterized in the first part. The second part is about the systems of tracking the photovoltaic panel to the sun and the stationary placement photovoltaic panel. The possibilities of increasing of power of photovoltaic panel and the factors, which influent the power of photovoltaic panel, are detailly described in the third part. The photovoltaic system in given lokality is designed in the fourth part. The experiments are designed, realised and evaluated in the next parts. The experiments are focused on practical verification of the power of stationary placed panel during the day and the year. The last part of this bachelor’s thesis deals with the evaluation of justifiability of use of solar trackers for photovoltaic systems in given locality from many points of view.
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Design of a photovoltaic power plant for a family house near Jihlava
Dvořák, Vít ; Maule, Petr (referee) ; Vaněk, Jiří (advisor)
This diploma thesis deals with the design of a photovoltaic solar power station for a specific family house in the Jihlava region. The aim of the work was to get acquainted with technologies about the production of solar systems, evaluate the market in the Czech Republic and create a design of photovoltaic solar power station. Three designs of power stations were created with the help of the PV * SOL design system. Each design uses different photovoltaic cell technology. The result of each power station design is a complete finished project, which is based on many factors such as the efficiency of the entire system in a certain location, financial analysis, return on investment and more. In addition, these projects meet the conditions for the preparation of the subsidy program Nová zelená úsporám. At the end of the work, all three designed power stations are evaluated and with the help of multicriteria analysis, the best and most advantageous power station design for the given locality is determined. In the end, the idea of further development of the project is presented.
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