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    Wyświetlanie 1-12 z 12
    Tytuł:
    Economic analysis of stationary and spatially optimized photovoltaic systems for Polish climatic conditions
    Autorzy:
    Bugała, A.
    Frydrychowicz-Jastrzębska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/97238.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    tracking system
    economic balance
    photovoltaics
    payback time
    Opis:
    The paper presents the economic aspect of use two - axis Sun tracking systems compared with stationary units in photovoltaics on the basis of own annual measurements of electrical energy for local urban conditions. The results were scaled to maximum power of 10 kWp. Electricity consumption by positioning system and maintenance costs were included and estimated payback period of investment for different variants of settlement of produced energy, taking into account own financing, banking and preferential subsidies under the Prosumer program from the National Fund for Environmental Protection and Water Management, was calculated.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 452-461
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sun tracking in PV systems aspects
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97242.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    photovoltaic system
    PV system
    sun tracking
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 333-346
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CIS, CIGS and CIBS thin film solar cells and possibilities of their application in BIPV
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97250.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    solar cell
    CIS
    heterojunction
    Light Soaking effect
    BIPV
    Opis:
    Photovoltaic thin–film solar cells have gained more and more popularity in recent years. As well as high efficiency, they have a number of properties allowing their application in BIPV. The paper presents thin film copper indium diselenide cells (CuInSe2 – CIS) and their modifications. Their electric and optical properties are characterised. The subject of presentation includes phenomena, which take place in these solutions as well as issues related to selection of absorbing–generating layers and a window layer, including the possibilities of solving these issues to obtain high efficiency of photovoltaic conversion. At present, the photovoltaic conversion is already at the level of 22.3% in laboratory conditions [29]. The examples of roof and facade applications of CIS with regards to buildings are provided.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 364-377
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected solutions in photovoltaic systems increasing their efficiency
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97495.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    solar cell
    concentrator
    PV module
    power gain
    Opis:
    The basic objective in photovoltaics is obtaining electrical energy with the costs comparable to the costs of energy obtained from conventional fuels. The effectiveness of acquisition of electrical energy from solar cells can be improved, among other things, by using solar radiation concentrators. Photovoltaic systems with low concentration (LCPV) and high concentration (HCPV) were characterised [13]. The possibilities of their operation under various conditions were presented, whereas the impact of temperature and concentration angle were considered in particular. The most modern solutions were presented, including Spin cell, Ephocell, Interdigitated Back Contact (IBC), Luminescent Solar Concentrator (LSC), High Concentration PhotoVoltaic Thermal (HCPVT), Concentration PhotoVoltaic (CPV), Telecontrolli. Results of current Polish research were given. In the years from 1985 to 2010 the increase from 17,5 % to 40,7 % in the efficiency of solar cells with concentrators was achieved [18].
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 462-474
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single – axis sun tracking unit with sensor control
    Autorzy:
    Bugała, A.
    Frydrychowicz-Jastrzębska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/97565.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    tracking system
    spatial orientation
    photovoltaics
    inclination angle
    microprocessor control
    Opis:
    The results of experimental verification of considerations conducted in [3] are presented, in terms of application single – axis tracking units, to increase the efficiency of the photovoltaic conversion, in comparison with fixed systems optimally oriented. The design and physical realization of a measurement stand is presented. A photovoltaic module inclination angle correlation algorithm, for a selected location and a measurement period, is described. The measurements were conducted in natural lighting conditions for different weather conditions. The current – voltage and power – voltage characteristics were compared for a fixed and vertically variable configuration. The value of the electric energy generated by tested photovoltaic modules in both cases was determined.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 414-422
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of external conditions and orientation of PV module on the energetic gain
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/97742.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    photovoltaic conversion
    double-axis tracker
    energetic gain
    external conditions
    Opis:
    Paper presents the influence of external conditions such as: the latitude φ, the solar declination δ, the hour angle ω, number of sunny hours, cloud cover and orientation of photovoltaic module on the energetic gain. The results of the measurements of radiation power density that reaches the surface of the PV receiver for its different positions, for the geographic location of the cities of Poznań and Playa del Ingles and for different time periods (yearly and daily) are presented in a graphical form. The study compares also production of electric power and energy in different weather conditions: cloudy, partly cloudy and cloudless sky using two- axis tracking system and fixed with one optimal angle setting during the year. Analyzed systems are located in Poznan on the roof of the Faculty of Electrical Engineering building. Distribution of power density of solar radiation in different days of the year was also compared.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 423-439
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent building systems
    Autorzy:
    Bugała, A.
    Frydrychowicz-Jastrzębska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/97401.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    intelligent building systems
    intelligent building
    DomoSim
    intelligent house
    Opis:
    The paper characterizes some selected aspects of intelligent building technology. Various functions are described that enable optimal controlling of the devices operating in accordance with previously programmed instructions and with current information. Such control is aimed at ensuring economic functioning of the building by reasonable and sound management of its resources (chiefly the energy) and to guarantee safety and comfort of the inhabitants. Examples of realization of these functions are presented, together with the computation - visualization software. The DomoSim visualization - designing software is characterized, that is intended for control and automation purposes. Applications of the discussed systems in Energy-Saving Intelligent Houses (ESH) have been presented.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 317-332
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    External conditions for using solar energy in photovoltaics
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376144.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    solar energy
    photovoltaic modules
    PV
    Opis:
    A consideration connected with the possibilities of obtaining solar energy depending on external conditions, such as: the latitude ϕ, the solar declination δ, the hour angle ω was performed. The operation of photovoltaic modules in very cloudy conditions as well as under clear sky was taken into consideration. The results of the measurements of radiation power density that reaches the surface of the photovoltaic receiver for its different positions, for the geographic location of the cities of Poznań and Playa del Ingles and for different time periods (yearly and daily) are presented in a graphical form.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 74; 289-299
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Management of an intelligent building
    Autorzy:
    Bugała, A.
    Frydrychowicz-Jastrzębska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/376208.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    intelligent building
    building management
    BMS
    building management system
    DomoSim
    Opis:
    The paper characterizes some selected aspects of intelligent building technology. Various functions are described that enable optimal controlling of the devices operating in accordance with previously programmed instructions and with current information. Such control is aimed at ensuring economic functioning of the building by reasonable and sound management of its resources (chiefly the energy) and to guarantee safety and comfort of the inhabitants. Examples of realization of these functions are presented, together with the computation - visualization software. The DomoSim visualization - designing software is characterized, that is intended for control and automation purposes.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 70; 189-196
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of parameters of spatial orientation of a solar power receiver on energetic gain
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376423.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    solar radiation
    Liu-Jordan method
    solar power receiver
    energetic gain
    Opis:
    The paper characterizes selected mathematical models for calculating power density of solar radiation incident on the plane inclined with regard to the base and directed at proper azimuth angle with regard to southern direction. Analysis of the presented methods is carried out and for purposes of further consideration the Liu-Jordan model has been adopted. The paper presents the results of power density of solar radiation obtained from computer simulation, with reference to a day, month, and year, in graphical form. Power gain at different spatial settings of the receiver was determined.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 70; 181-188
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power and decorative solar façades
    Autorzy:
    Frydrychowicz-Jastrzębska, G.
    Bugała, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376781.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    PV
    solar façades
    photovoltaic module
    Opis:
    The work presents an analysis of the possibility of obtaining electric energy from a PV façade, both in the case of standard fitting - tilted at the angle of 90° and directed towards the south, and for a wall fitted at the angle of 75° also directed towards the south. In order to determine the energy gains expected in the second case, a computer simulation confirming the assumptions was executed.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 74; 261-268
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction of heavy aircraft wakes
    Wzajemne oddziaływanie wirów zaskrzydłowych dużych samolotów
    Autorzy:
    Bugała, P.
    Dziubiński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/213035.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    CFD
    vortex decay
    vortex interaction
    rozpad wirów
    oddziaływanie wirów
    Opis:
    In the next few years the problem of heavy aircraft wakes may increase on the account of continuous air transport growth. However, it can be noticed that even today the number of accidents resulting from an interaction with wakes is increasing. That is the reason why methods of wake vortex description should be searched for. The aim of this study is to analyze interaction of example aircraft wakes. In this paper the characteristics of vortex wake behind three-dimensional wing arc presented. It shows how a separation between aircraft affects the decay of vortex. Two- and three-dimensional calculations were performed using commercial RANS code. The following cases have been taken into consideration: flow past a full commercial aircraft, three-dimensional flow over the simplified wing and a two-dimensional analysis of vortex decay caused by the landing aircraft, including the separation effect. For all these cases a CFD simulation of the aircraft wakes was conducted. One of the main outcome of this work is a confirmation that the interaction between wakes consists of spreading out and lifting wakes. The achieved results show that the two-dimensional simulation is a sufficient tool for a preliminary analysis of wake vortices. Conclusions from this analysis can be used by the managements of busy international airports to enhance safety.
    W ciągu kilku kolejnych lat, problem wirów powstających za ciężkimi samolotami, może wzrastać z powodu rozwoju ruchu lotniczego. Jednak już dziś można zauważyć rosnącą liczbę wypadków spowodowanych interferencją z wirami. To jest powód, dla którego metody opisu wirów powinny stać się przedmiotem badań. Celem niniejszej pracy jest analiza interferencji wirów powstających za wybranym samolotem pasażerskim. W artykule zaprezentowano charakterystykę zaburzenia powstającego za trójwymiarowym skrzydłem. Niniejsza praca ukazuje wpływ separacji między samolotami na rozpad wirów. Dwu- i trójwymiarowe obliczenia zostały wykonane przy użyciu komercyjnego kodu RANS. Następujące przypadki zostały wzięte pod uwagę: przepływ za pełno wy miarowym samolotem komercyjnym, trójwymiarowa analiza wirów za uproszczonym skrzydłem oraz dwuwymiarowa symulacja rozpadu wirów za lądującymi samolotami z uwzględnieniem separacji. Dla wszystkich tych przypadków zostały przeprowadzone analizy CFD. Jednym z najistotniejszych rezultatów pracy jest potwierdzenie, że interakcja pomiędzy zaburzeniami polega na rozchodzeniu i unoszeniu się wirów. Uzyskane wyniki pokazują, że obliczenia dwuwymiarowe są wystarczające do wstępnej analizy wirów. Wnioski tych analiz mogą być wykorzystane przez zarządy zatłoczonych, międzynarodowych lotnisk do utrzymania odpowiedniego poziomu bezpieczeństwa.
    Źródło:
    Prace Instytutu Lotnictwa; 2016, 4 (245); 309-320
    0509-6669
    2300-5408
    Pojawia się w:
    Prace Instytutu Lotnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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