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Wyszukujesz frazę "PEM" wg kryterium: Temat

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Dynamic characteristics of the proton exchange membrane fuel cell module
    Autorzy:
    Cieśliński, J. T.
    Kaczmarczyk, T. Z.
    Dawidowicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/240068.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PEM fuel cell
    hydrogen
    dynamic characteristics
    ogniwo paliwowe PEM
    wodór
    charakterystyka dynamiczna
    Opis:
    The paper describes a fuel cell based system and its performance. The system is based on two fuel cell units, DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and a set of measurement instruments. In the study presented in the paper a dynamic response of the proton exchange membrane (PEM) fuel cell system to unit step change load as well as to periodical load changing cycles in the form of semi-sinusoidal and trapezoidal signals was investigated. The load was provided with the aid of an in-house-developed electronic load unit, which was fully PC controlled. The apparatus was commissioned by testing the steady-state operation of the module. The obtained efficiency of the fuel cell shows that the test apparatus used in the study provides data in substantial agreement with the manufacturer’s data.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 125--140
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exergetic sustainability indicators of a polymer electrolyte membrane fuel cell at variable operating conditions
    Autorzy:
    Xu, Bing
    Chen, Yan
    Ma, Zheshu
    Powiązania:
    https://bibliotekanauki.pl/articles/1845491.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PEM fuel cell
    exergy balance
    exergy analysis
    exergetic sustainability indicators
    Opis:
    Based on the exergetic sustainability indicators of polymer electrolyte membrane (PEM) fuel cell, this paper studied the effects of irreversibility of thermodynamics on some exergetic sustainability indicators of PEM fuel cell under changing operating temperature, operating pressure and current density. Some conclusions are drawn by analyzing the curves. As the operating temperature increases, the negative impact of PEM fuel cell on various parameters due to irreversibility decreases; As the operating pressure increases, the negative impact of PEM fuel cell on various parameters due to irreversibility decreases; On the other hand, with the increase of current density, the negative impact of the PEM fuel cell on various parameters due to irreversibility increases.
    Źródło:
    Archives of Thermodynamics; 2021, 42, 1; 183-204
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMF Exposure Modelling in the Vicinity of the Radiocommunication Stations
    Autorzy:
    Więcek, Dariusz
    Niewiadomski, Daniel
    Mora, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/226900.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    exposure limits
    electric field strength distribution
    5G
    EMF modelling
    SI2PEM
    Opis:
    Due to rapid development of wireless systems and future implementation of the 5G system, it is necessary to increase number of the stations and/or number of radio emissions in current and new mobile service frequency bands. For each of the new or modified radio installation in Poland the Electromagnetic Field (EMF) strength levels has to be evaluated and measured/validated in accordance with allowable limits. In the paper the model of estimation of total EMF levels coming from mobile base stations radio emissions to be used for estimation of the whole country territory EMF levels is proposed. Results of preliminary analysis were also shown on practical examples. The model presented in the paper can be used for initial finding of possible places where exist the risk of exceedance of the maximum exposure limits and for analysis of potential radio network development taking into account current regulatory limits. The model will be used in computerized system SI2PEM which is developing in Poland for EMF levels controlling and validation purposes.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 5-10
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new power management strategy for PV-FC-based autonomous DC microgrid
    Autorzy:
    Bhat Nempu, P.
    Sabhahit Jayalakshmi, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/140476.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DC microgrid
    electrolyzer
    fuzzy logic controller
    PEM fuel cell
    PV Array
    supercapacitor bank
    Opis:
    Solar energy is widely available in nature and electricity can be easily extracted using solar PV cells. A fuel cell being reliable and environment friendly becomes a good choice for the backup so as to compensate for continuously varying solar irradiation. This paper presents simple control schemes for power management of the DC microgrid consisting of PV modules and fuel cell as energy sources and a hydrogen electrolyzer system for storing the excess power generated. The supercapacitor bank is used as a short term energy storage device for providing the energy buffer whenever sudden fluctuations occur in the input power and the load demand. A new power control strategy is developed for a hydrogen storage system. The performance of the system is assessed with and without the supercapacitor bank and the results are compared. A comparative study of the voltage regulation of the microgrid is presented with the controller of the supercapacitor bank, realized using a traditional PI controller and an intelligent fuzzy logic controller.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 4; 815-828
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probabilistic estimation of diverse soil condition impact on vertical axis tank deformation
    Autorzy:
    Żyliński, Kamil
    Górski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2204506.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    storage tank
    foundation settlement
    subsoil parameters
    point estimated method
    PEM
    zbiornik magazynujący
    osiadanie fundamentów
    parametry podłoża
    metoda estymacji punktowej
    Opis:
    The calculations of fuel tanks should take into account the geometric imperfections of the structure as well as the variability of the material parameters of the foundation. The deformation of the tank shell can have a significant impact on the limit state of the structure and its operating conditions. The paper presents a probabilistic analysis of a vertical-axis, floating-roof cylindrical shell of a tank with a capacity of 50000 m3 placed on stratified soil with heterogeneous material parameters. The impact of a random subsoil description was estimated using the Point Estimated Method (PEM). In this way, the number of analyzed FEM models was significantly reduced. This approach also makes it possible to assess the sensitivity of tank settlement and deformation to the changing foundation conditions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144576
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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