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    Wyświetlanie 1-6 z 6
    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:
    Fuel cells - the future of electricity generation for portable applications
    Autorzy:
    Pierozynski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/363228.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    ogniwo paliwowe PEM
    przenośne aplikacje
    energia odnawialna
    paliwo kopalne
    fossil fuel
    PEM fuel cells
    portable applications
    renewable energy
    Opis:
    Fossil fuels, including crude oil, coal and natural gas are currently the key resources for world energy supply. Hence, the majority of electrical energy production is realized via combustion of conventional fuels, such as: coal, methane and petroleum. However, increasing emissions of pollutants and greenhouse gases from fossil fuel-based electricity production (especially withrespect to SO2, NOx and CO2 discharge) bring about major environmental concerns. In addition, the status of conventional (fossil) fuel reserves is still uncertain. Thus, production of "clean" electrical energy, especially from renewable resources, such as: biomass, solar, photovoltaic, geothermal, hydro and wind energy sources becomes of significant importance to the world's economy. Fuel cells (FCs) are electrochemical cells, which convert a source fuel (e.g. H2, CH4, alcohols, etc.) into an electric current. They generate electricity inside a cell via electrochemical reactions between a fuel and an oxidant, in the presence of an electrolyte. In general, most of fuel cells can be operated as emission-free devices, based on fuels produced fromrenewable resources. With a variety of possible FC types, fuel cells could potentially serve in stationary, transportation or portable applications. This work is a review of the state-of-the-art in fuel cell technology, with respect to FC employment in portable applications.
    Źródło:
    Environmental Biotechnology; 2008, 4, 2; 60-64
    1734-4964
    Pojawia się w:
    Environmental Biotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-symptom measurement based fault detection of the PEM fuel cell system
    Autorzy:
    Polak, Adam
    Kluczyk, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/11542695.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    PEM fuel cell
    failure detection
    oxygen starvation
    cell flooding
    acoustic emission
    ogniwo paliwowe PEM
    wykrywanie awarii
    emisja akustyczna
    Opis:
    The proper functioning of the fuel cell system depends on the proper operation of all its subsystems. One of the key subsystems is the oxidant supply system, which is responsible for supplying oxygen for the electrochemical reaction taking place in the cell. It also transports the reaction products, i.e., water, outside the fuel cell stack, and in some cases removes excess heat generated in the stack. Changes in the technical condition of machine individual elements always result in changes in operating or residual parameters; however, it is necessary to select appropriate diagnostic methods to be able to use these changes to assess the machine’s technical condition. This article presents the results of research focused on assessing the possibilities of diagnosing the oxidant supply subsystem, in particular, too low an oxidant flow leading to oxygen starvation and cathode flooding, based on the analysis of the voltage occurring in individual cells of the stack as well as on the basis of vibration and acoustic emission (AE) measurements. The presented results show that the faulty operation of that system can be indicated either through electrical and vibroacoustic/acoustic emission measurements.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2023, 33, 2; 197--205
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust Diagnosis of a Proton Exchange Membrane Fuel Cell Using Bond Graph Methodology – Physical and Electrical Faults Detection and Isolation
    Autorzy:
    Sallami, Abderrahmene
    Mzoughi, Dhia
    Allagui, Hatem
    Mami, Abdelkader
    Powiązania:
    https://bibliotekanauki.pl/articles/103256.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    robust diagnosis
    bond graph approach
    PEM fuel cell
    linear fractional transformation
    performance of the observer
    solidna diagnoza
    podejście do wykresu wiązań
    ogniwo paliwowe PEM
    liniowe transformacje ułamkowe
    ocena wyników obserwatora
    Opis:
    Fuel cells are currently experiencing an invigorating resurgence, both at the industrial and research levels. Diagnosis of stack performance is of importance for proton exchange membrane fuel cell (PEMFC) research. In this paper, a bond graph (BG) approach was used for modelling, simulation and robust diagnosis of a PEMFC. In literature, several PEMFC diagnosis methodologies were outlined in terms of efficiency and applicability. This paper described the linear fractional transformations (LFT) method to make it capable for handling the PEMFC diagnostics; an approach based on LFT-BG was developed to diagnose hydration and cells deterioration faults that may occur within a fuel cell. Simulation and experimental diagnostic testing results of a 1.2 kW Nexa fuel cell were presented and used to show the dynamic behaviour of the system variables and assessing the performance of the observer.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 4; 194-203
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical investigation of channel geometry on the performance of a PEM fuel cell
    Autorzy:
    Khazaee, I.
    Mohammadiun, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/264366.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    ogniwo paliwowe
    modelowanie numeryczne
    wydajność
    PEM fuel cell
    rectangular
    triangular
    elliptical
    numerical modeling
    performance
    Opis:
    A complete three-dimensional and single phase model for proton exchange membrane (PEM) fuel cells was used to investigate the effect of using different channels geometry on the performances, current density and gas concentration. The proposed model was a full cell model, which includes all the parts of the PEM fuel cell, flow channels, gas diffusion electrodes, catalyst layers and the membrane. Coupled transport and electrochemical kinetics equations were solved in a single domain; therefore no interfacial boundary condition was required at the internal boundaries between cell components. This computational fluid dynamics code was employed as the direct problem solver, which was used to simulate the three-dimensional mass, momentum, energy and species transport phenomena as well as the electron- and proton-transfer process taking place in a PEMFC. The results showed that the predicted polarization curves by using this model were in good agreement with the experimental results and a high performance was observed by using circle geometry for the channels of anode and cathode sides. Also, the results showed that the performance of the fuel cell improved when a rectangular channel was used.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 85-98
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical investigation and improvement of performance of a proton exchange membrane (PEM) fuel cell in mobile applications
    Autorzy:
    Khazaee, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/264425.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    PEM fuel cell
    performance
    semi-empirical method
    mobile application
    wydajność
    aplikacja mobilna
    ogniwo paliwowe
    Opis:
    In this study, the performance of a proton exchange membrane fuel cell in mobile applications is investigated analytically. At present the main use and advantages of fuel cells impact particularly strongly on mobile applications such as vehicles, mobile computers and mobile telephones. Some external parameters such as the cell temperature, operating pressure of gases (P) and air stoichiometry affect the performance and voltage losses in the PEM fuel cell. Because of the existence of many theoretical, empirical and semi-empirical models of the PEM fuel cell, it is necessary to compare the accuracy of these models. But theoretical models that are obtained from thermodynamic and electrochemical approach, are very exact but complex, so it would be easier to use the empirical and smi-empirical models in order to forecast the fuel cell system performance In many applications such as mobile applications. The main purpose of this study is to obtain the semi-empirical relation of a PEM fuel cell with the least voltage losses. Also, the results are compared with the existing experimental results in the literature and a good agreement is seen.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 319-328
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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