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Investigation into the Flow of Gas-Solids during Dry Dust Collectors Exploitation, as Applied in Domestic Energy Facilities – Numerical Analyses

Maćkowiak Albert, Kostrzewski Mariusz, Bugała Artur, Chamier-Gliszczyński Norbert, Bugała Dorota, Jajczyk Jarosław, Woźniak Waldemar, Dombek Grzegorz, Nowak Karol

Eksploatacja i Niezawodność

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2023

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Vol. 25, no. 4

art. no. 174095

EN

The paper presents the results related to the simulation of dust-separating tangential cyclones: single cyclones of various geometries, and an axial multi-cyclone with fixed geometries and components. Its goal was to apply low-cost analyses for cyclones in industrial realization. Therefore, the presented research was applied with simulation methodology as a problem of Computational Fluid Dynamics. The models were analyzed using SolidWorks Flow Simulation software. The presented dust collectors are real-life objects, applied in industrial facilities. For a multi-cyclone, the increase in the number of blades, from 5 to 8, together with the change in the angle of a blade’s pitch i.e., 30° and 45°, resulted in dust concentration along the internal walls from just 10% for 5 blades up to c.a. 37.5% for 6 blades, and c.a. 50% for 8 blades, whereas the dust concentration in the device’s central part equals c.a. 20% for the last option. The model validation draws attention to the potential applicability of the software in flow issues alongside common and more complex numerical environments.

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Statistical Analysis of Electrical and Non-Electrical Parameters of Photovoltaic Modules in Controlled Tracking Systems

Bugała Artur, Bugała Dorota, Jajczyk Jarosław, Dąbrowski Tomasz

Rocznik Ochrona Środowiska

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2021

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Tom 23

694--714

EN

The paper presents statistical analysis of measurement results of electrical parameters for photovoltaic modules installed in stationary and dual-axis configurations. The parameters which were taken into account included: coefficient of variation, skewness and standard deviation. Also a correlation was determined between independent variables such as insolation, sunshine duration, cloudiness, ambient temperature and atmospheric pressure, and the dependent variable in the form of the daily electricity from photovoltaic conversion. In order to determine the repeatability of electricity waveforms occurring between summer months as well as between summer and winter months, the non-parametric U Mann-Whitney test was used. In order to analyse the repeatability of daily peak hours in which the highest value of the hourly electricity production is observed, the non-parametric Kruskal-Wallis test was used. The tested systems were connected to the power grid and operated independently. Test stands consisting of polycrystalline photovoltaic modules, single-phase on-grid inverters, irradiance sensors and a temperature recorder, were located on the building rooftop of the Faculty of Control Robotics and Electrical Engineering of the Poznan University of Technology in Poland (Central Poland, 52°24.4152′N, 16°55.7958′E) at the height of 30 metres above the ground level. A significant increase in the production of electricity using the PV module spatial positioning system was demonstrated in relation to modules based on the year-round modified design.

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Wieże hybrydowe turbin wiatrowych – alternatywną koncepcją magazynowania energii

Frydrychowicz-Jastrzębska Grażyna, Bugała Dorota

Przegląd Elektrotechniczny

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2021

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R. 97, nr 9

15--20

PL

W pracy przedstawiono innowacyjny system energetyczny wiatrowo-wodny. Należą do niego 4 turbiny wiatrowe, aktualnie najwyższe na świecie oraz zintegrowany układ magazynowania energii – zrealizowany na dwóch poziomach. Magazyny górne zrealizowano w zbiornikach wodnych umieszczonych w fundamentach wież hybrydowych turbin wiatrowych, jako magazyn dolny wykorzystano zbiornik wodny w dolinie, odległy o 3,2 km, zlokalizowany o 200 m niżej. Komponenty układu działają w sposób zintegrowany i niezawodnie.

EN

The paper presents an innovative wind-water energy system. It includes 4 wind turbines, currently the highest in the world and an integrated energy storage system – implemented on two levels. The upper warehouses were built in water reservoirs placed in the foundations of the hybrid turbine towers, while the bottom storehouse was a water reservoir in the Valley, 3,2 km away, located 200 m below. The system components operate In an integrated and reliable way.

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Odporność instalacji fotowoltaicznej na elektromagnetyczne zaburzenia udarowe

Bugała Dorota, Bugała Artur

Poznan University of Technology Academic Journals. Electrical Engineering

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2019

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No. 97

75--85

PL

W pracy dokonano analizy poprawności funkcjonowania instalacji fotowoltaicznej o znamionowej mocy elektrycznej 3500 W, składającej się z 14 modułów fotowoltaicznych oraz przetwornika energoelektronicznego w postaci jednofazowego falownika napięcia, wyposażonego w układ śledzenia punktu mocy maksymalnej, w przypadku wystąpienia udarowego zakłócenia elektromagnetycznego typu surge. Udar napięciowy o parametrach 1,2/50 μs, symulujący wyładowanie piorunowe, został wprowadzony do układu od strony sieci elektroenergetycznej. W celu komputerowego odwzorowania sygnału zaburzającego wykorzystano zalecenia zawarte w normie PN-EN 61000-4-5 „badanie odporności na udary typu surge”. Wykazano istotne zmiany wartości napięcia elektrycznego po stronie stałoprądowej, związanej z układem generacji mocy elektrycznej przez układ fotowoltaiczny, oraz zmiennoprądowej w układzie przemiennika DC/AC.

EN

The work analyzes the correctness of the photovoltaic system operation with a nominal electrical power of 3500 W, consisting of 14 solar modules and a power electronics transducer in the form of a single-phase voltage inverter equipped with a maximum power point tracking system, in the case of a surge electromagnetic interference. The voltage surge with the parameters 1.2/50 μs, simulating a lightning discharge, was introduced into the system from the power grid side. For the purpose of computer imaging of the disturbing signal, the recommendations included in the PN-EN 61000-4-5 standard "Surge Resistance Test" were used. Significant changes in the voltage value on the DC side, related to the system of electric power generation by the solar system, and AC current in the DC/AC converter system have been shown.