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    Wyświetlanie 1-6 z 6
    Tytuł:
    Experimental and Theoretical Study on a Wind Energy Unit
    Autorzy:
    Abusamaha, Hanan M.
    Dawoud, Farah
    Al-Qalab, B.
    Ayadi, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/123619.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    wind turbine
    angle of attack
    power curve
    Opis:
    The conversion process in the wind turbine, from mechanical (kinetic) energy to electrical energy, is affected by many factors that increase or decrease the useful output of the wind energy convertor. In this paper, three factors were studied experimentally on a Horizontal Axis Wind Energy Unit “EEEC” in laboratory-scale. The aim of this experiment was to study the influence of the number of blades, the angle of attack and the incident angle on the wind energy unit parameters to optimize its efficiency. For this purpose, the effect of the number of blades was studied firstly, in order to select the number of blades where the maximum inputs obtained at lab ambient temperature 25 °C and atmospheric pressure. Then, different readings of the incident angle and angle of attacks were taken. The data was analyzed using Microsoft Excel software. The results show that the maximum parameters of wind unite energy that produce the maximum efficiency, namely: voltage (volt), current (ampere) and rotational speed (rpm) are obtained when the number of blades is 4, the incident angle is 0° (when the rotor direction is with wind direction) and the angle of attack is 75°. Finally, these results were implemented in a simulation program (HOMER software) that uses this turbine in a resident along with storage to cover the needs of a selected house.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 6; 207-214
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical approach to the physics of fuel cells
    Autorzy:
    Wijewardena Gamalath, K. A. I. L.
    Peiris, B. M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/411573.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ogniwa paliwowe
    transport jonów
    gradient stężenia
    straty polaryzacyjne
    krzywa polaryzacji
    krzywa mocy
    fuel cell
    ion transport rate
    concentration gradient
    polarization losses
    polarization curve
    power curve
    Opis:
    Ion transport rate of PAFC, AFC, PEMFC, DMFC and SOFC fuel cells under the influence of an electric field and concentration gradient were evaluated for static electrolytes. AFC are the best fuel cells for high er current applications while direct methanol fuel cells DMFC are the best for lower current applications AT lower temperatures. An equation for voltage output of a general fuel cell was obtained in terms of temperature and partial pressure of reactants. Performance of a 2D fuel cell was analyzed by simulating polarization and power curves for a fuel cell operating at 60 ?C with a limiting current density of 1.5 A cm- 2. The maximum power for this fuel cell was 8.454 W delivering 82% of maximum loading current density. When the temperature was increased by one third of its original value, the maximum power increased by 6.75% and at 60 ?C for a 10 times increment of partial pressure of reactants, the maximum power increased by 2.43%.The simulated power curves of the fuel cells were best described by cubic fits.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 2; 15-27
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Partial Shading Detection in Solar System Using Single Short Pulse of Load
    Autorzy:
    Bartczak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221207.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    maximum power point
    partial shading
    load pulse
    test station
    I-V curve
    Opis:
    A single photovoltaic panel under uniform illumination has only one global maximum power point, but the same panel in irregularly illuminated conditions can have more maxima on its power-voltage curve. The irregularly illuminated conditions in most cases are results of partial shading. In the work a single short pulse of load is used to extract information about partial shading. This information can be useful and can help to make some improvements in existing MPPT algorithms. In the paper the intrinsic capacitance of a photovoltaic system is used to retrieve occurrence of partial shading.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 1; 193-199
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis and modeling of load parameters of wind power station
    Autorzy:
    Medykovskyj, M.
    Kravchyshyn, V.
    Shunevych, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/410969.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    wind power station (WPS)
    load curve
    management system
    input load parameters simulation
    Opis:
    The method and the load parameters dynamics simulation algorithm fed to the input of the energy-dynamic wind power station modes management system have been developed. Based on the real data analysis, we obtained dependencies of the management system input data changes for the specific time intervals. Input load parameters were simulated using the developed method. We have obtained data for the neural network training with the justification of changes in active wind power composition. The results are shown in a load parameters table as input management system data and estimated load charts. The results are important for the wind power station management system simulation as they provide higher reliability and accuracy of the results.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 2; 19-24
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of constant parameters of copper as power-law hardening material at different test conditions
    Autorzy:
    Kowser, M. A.
    Mahiuddin, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/955240.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    power-law hardening constant
    work-hardening process
    stress hardening exponent
    power-law hardening material
    heat treatment
    tensile test
    stress-strain curve
    proces utwardzania
    obróbka cieplna
    próba rozciągania
    Opis:
    In this paper a technique has been developed to determine constant parameters of copper as a power-law hardening material by tensile test approach. A work-hardening process is used to describe the increase of the stress level necessary to continue plastic deformation. A computer program is used to show the variation of the stress-strain relation for different values of stress hardening exponent, n and power-law hardening constant, α . Due to its close tolerances, excellent corrosion resistance and high material strength, in this analysis copper (Cu) has been selected as the material. As a power-law hardening material, Cu has been used to compute stress hardening exponent, n and power-law hardening constant, α from tensile test experiment without heat treatment and after heat treatment. A wealth of information about mechanical behavior of a material can be determined by conducting a simple tensile test in which a cylindrical specimen of a uniform cross-section is pulled until it ruptures or fractures into separate pieces. The original cross sectional area and gauge length are measured prior to conducting the test and the applied load and gauge deformation are continuously measured throughout the test. Based on the initial geometry of the sample, the engineering stress-strain behavior (stress-strain curve) can be easily generated from which numerous mechanical properties, such as the yield strength and elastic modulus, can be determined. A universal testing machine is utilized to apply the load in a continuously increasing (ramp) manner according to ASTM specifications. Finally, theoretical results are compared with these obtained from experiments where the nature of curves is found similar to each other. It is observed that there is a significant change of the value of n obtained with and without heat treatment it means the value of n should be determined for the heat treated condition of copper material for their applications in engineering fields.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 4; 687-698
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hilbert curve fractal antenna for detection and on-line monitoring of partial discharges in power transformers
    Antena fraktalna Hilberta do detekcji i monitoringu wyładowań niezupełnych w transformatorach energetycznych
    Autorzy:
    Sikorski, W.
    Szymczak, C.
    Siodła, K.
    Polak, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/300766.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    fault diagnosis
    maintenance of power transformers
    partial discharge detection
    monitoring
    UHF method
    Hilbert curve fractal antenna
    diagnostyka uszkodzeń
    eksploatacja transformatorów energetycznych
    detekcja wyładowań niezupełnych
    monitoring wyładowań niezupełnych
    metoda UHF
    antena fraktalna Hilberta
    Opis:
    This article describes the design of UHF Hilbert curve fractal antenna (HCFA) specially adapted for the partial discharge monitoring system. The authors present the mathematical apparatus for calculating resonant frequencies of Hilbert fractal antenna and results of a computer simulation of the developed prototype. In the design process, the antenna’s working environment (mineral oil) and the mechanical construction of the transformer inspection window were taken into consideration as well. The article also shows the results of laboratory tests carried out in the transformer tank model with different type of partial discharge sources. Both simulations and partial discharge measurements showed that the HCFA, due to such properties as: multi-resonance, small size, low fabrication cost and high sensitivity, is an interesting alternative to other UHF probes installed in transformer inspection window.
    W artykule zaprezentowano projekt anteny fraktalnej Hilberta przeznaczonej do stosowania w systemach monitoringu wyładowań niezupełnych wykorzystujących metodę UHF. Autorzy szczegółowo opisali aparat matematyczny służący do estymacji częstotliwości rezonansowych anteny fraktalnej Hilberta oraz wyniki symulacji komputerowych. Ponadto, w artykule zaprezentowano wyniki pomiarów laboratoryjnych, w trakcie których generowano impulsy wyładowań niezupełnych w modelu kadzi transformatora energetycznego. Zarówno wyniki symulacji komputerowych jak i pomiarów laboratoryjnych wykazały, że prototypowa antena fraktalna Hilberta, dzięki takim własnościom jak: wielorezonansowość, małe wymiary, niski koszt produkcji oraz wysoka czułość, stanowi ciekawą alternatywę dla innych czujników UHF instalowanych w oknie rewizyjnym transformatora energetycznego.
    Źródło:
    Eksploatacja i Niezawodność; 2018, 20, 3; 343-351
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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