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    Wyświetlanie 1-9 z 9
    Tytuł:
    CFD Analysis of Heat Transfer in a Microtubular Solid Oxide Fuel Cell Stack
    Autorzy:
    Pianko-Oprych, P.
    Kasilova, E.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/185553.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    przenikanie ciepła
    strata ciepła
    rozkład temperatur
    microtubular Solid Oxide Fuel Cell stack
    heat transfer
    heat losses
    temperature distributions
    computational fluid dynamics (CFD)
    Opis:
    The aim of this work was to achieve a deeper understanding of the heat transfer in a microtubular Solid Oxide Fuel Cell (mSOFC) stack based on the results obtained by means of a Computational Fluid Dynamics tool. Stack performance predictions were based on simulations for a 16 anodesupported mSOFCs sub-stack, which was a component of the overall stack containing 64 fuel cells. The emphasis of the paper was put on steadystate modelling, which enabled identification of heat transfer between the fuel cells and air flow cooling the stack and estimation of the influence of stack heat losses. Analysis of processes for different heat losses and the impact of the mSOFC reaction heat flux profile on the temperature distribution in the mSOFC stack were carried out. Both radiative and convective heat transfer were taken into account in the analysis. Two different levels of the inlet air velocity and three different values of the heat losses were considered. Good agreement of the CFD model results with experimental data allowed to predict the operation trends, which will be a reliable tool for optimisation of the working setup and ensure sufficient cooling of the mSOFC stack.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 3; 293-304
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The control of the working parameters of car hydrogen fuel cell stack in urban traffic conditions
    Autorzy:
    Tyczka, M.
    Skarka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/393687.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    regulation
    optimization
    hydrogen cell stack
    fuel cell stack
    hydrogen car
    regulacja
    optymalizacja
    stos ogniw wodorowych
    stos ogniw paliwowych
    samochód wodorowy
    Opis:
    The paper describes the study of the control of the hydrogen fuel cell stack for a car, which has been prepared on the example of a light vehicle, built for racing competitions. The issue included of the control of the hydrogen cell stack in the conditions of varied energy demand, occurring during urban traffic and selection of system parameters, using numerical model.
    Źródło:
    Archives of Transport System Telematics; 2016, 9, 3; 50-54
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of applied control strategy on the current-voltage correlation of a solid oxide fuel cell stack during dynamic operation
    Autorzy:
    Szmyd, J. S.
    Komatsu, Y.
    Brus, G.
    Ghigliazza, F.
    Kimijima, S.
    Ściążko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240833.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solid oxide fuel cells
    stack operation
    dynamic operation
    current-based fuel control
    fuel utilization factor
    stałotlenkowe ogniwa paliwowe
    działania dynamiczne
    kontrola
    paliwo
    utylizacji paliwa
    Opis:
    This paper discusses the transient characteristics of the planar type SOFC cell stack, of which the standard output is 300 W. The transient response of the voltage to the manipulation of an electric current was investigated. The effects of the response and of the operating condition determined by the operating temperature of the stack were studied by mapping a current-voltage (I-V) correlation. The current-based fuel control (CBFC) was adopted for keeping the fuel utilization factor at constant while the value of the electric current was ramped at the constant rate. The present experimental study shows that the transient characteristics of the cell voltage are determined by primarily the operating temperature caused by the manipulation of the current. Particularly, the slope of the I-V curve and the overshoot found on the voltage was remarkably influenced by the operating temperature. The different values of the fuel utilization factor influence the height of the settled voltages. The CBFC has significance in determining the slope of the I-V characteristic, but the different values of the fuel utilization factor does not affect the slope as the operating temperature does. The CBFC essentially does not alter the amplitude of the overshoot on the voltage response, since this is dominated by the operating temperature and its change is caused by manipulating the current.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 3; 129-143
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of fuel cells under static and dynamic conditions
    Autorzy:
    Szwajca, Filip
    Berger, Andrew W.
    Spalletta, Robert
    Pielecha, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/32101706.pdf
    Data publikacji:
    2022-12-28
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    fuel cell stack
    fuel cell module
    static and dynamic characteristics
    fuel cell efficiency
    Opis:
    Modern internal combustion powertrains are the main source of propulsion for on-road and non-road vehicles. However, they are increasingly being replaced by electric or fuel cell-equipped alternative propulsion systems. The article presents a study of fuel cell characteristics operating under both static and dynamic conditions, with a 1.2 kW fuel cell set with a voltage converter and lead-acid batteries. In the conducted tests, the fuel cell stack's maximum efficiency reached 65%. Load tests (static and dynamic) have indicated higher fuel cell efficiencies when using hybrid operation with a DC/DC converter and battery.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2022, 3-4; 44-52
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantification of the Radiative and Convective Heat Transfer Processes and their Effect on mSOFC by CFD Modelling
    Autorzy:
    Pianko-Oprych, P.
    Kasilova, E.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778685.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    microtubular Solid Oxide Fuel Cell stack
    heat transfer
    computational fluid dynamics (CFD)
    temperature distributions
    Opis:
    The CFD modelling of heat transfer in a microtubular Solid Oxide Fuel Cell (mSOFC) stack has been presented. Stack performance predictions were based on a 16 anode-supported microtubular SOFCs sub-stack, which is a component of the overall stack containing 64 fuel cells. Both radiative and convective heat transfer were taken into account in the modelling. The heat flux value corresponded to the cell voltage of 0.7 [V]. Two different cases of the inlet air velocity of 2.0 and 8.5 [ms–1] were considered. It was found that radiation accounted for about 20–30 [%] of the total heat flux from the active tube surface, which means that the convective heat transfer predominated over the radiative one.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 2; 51-55
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of the steady-state behaviour of a new design of a single planar Solid Oxide Fuel Cell
    Autorzy:
    Pianko-Oprych, P.
    Zinko, T.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/778012.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    planar Solid Oxide Fuel Cell stack
    computational fluid dynamics (CFD)
    voltage-current
    characteristics
    temperature distributions
    Opis:
    The aim of the work was to develop a mathematical model for computing the steady-state voltage – current characteristics of a planar Solid Oxide Fuel Cell and to determine the performance of a new SOFC design. The design involves cross-flow bipolar plates. Each of the bipolar plates has an air channel system on one side and a fuel channel system on the other side. The proposed model was developed using the ANSYS-Fluent commercial Computational Fluid Dynamics (CFD) software supported by additional Fuel Cell module. The results confirm that the model can well simulate the diagonal current path. The effects of temperature and gas flow through the channels and a Membrane Electrode Assembly (MEA) structure were taken into account. It was shown that a significant increase of the MEA temperature at high current density can lead to hot spots formation and hence electrode damage.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 1; 64-71
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The method of determining PEMFC fuel cell stack performance decrease rate based on the voltage-current charact eristic shift
    Metoda wyznaczania szybkości spadku wydajności stosu ogniw paliwowych typu PEMFC na podstawie przesunięcia charakterystyki napięciowo-prądowej
    Autorzy:
    Ceran, Bartosz
    Orłowska, Agata
    Krochmalny, Krystian
    Powiązania:
    https://bibliotekanauki.pl/articles/1841860.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    fuel cells system exploitation
    fuel cell stack exploitation indicators
    stack performance decrease after years of operation
    stack exploitation characteristics
    eksploatacja systemów ogniw paliwowych
    wskaźniki eksploatacyjne stosu ogniw paliwowych
    spadek wydajności stosu po latach eksploatacji
    charakterystyka eksploatacyjna stosu
    Opis:
    The article presents mathematical model designed to estimate the rate of performance decrease in fuel cell stack. The fuel cell stack performance decrease rate is determined on the basis of stack average voltage measurements. The proposed model is used to determine power curve as well as exploitation indicators of fuel cell stack with a nominal power of 50 kW after 14 000 hours of continuous operation. The model is also used to determine the average voltage drop for the eleven-year fuel cell stack with a nominal power of 1,2 kW. In both studies, the values of exploitation indicators as well as their differences in relation to nominal values are determined.
    Artykuł przedstawia model matematyczny przeznaczony do wyznaczenia szybkości spadku wydajności stosu ogniw paliwowych. Szybkość spadku wydajności stosu ogniw jest wyznaczana na podstawie wartości napięcia średniego stosu. Zaproponowany model wykorzystano do wyznaczenia krzywej mocy i wskaźników eksploatacyjnych stosu ogniw paliwowych o mocy nominalnej 50 kW po 14 000 h ciągłej pracy. Model wykorzystano także do wyznaczenia szybkości zmiany wartości napięcia średniego jedenastoletniego stosu ogniw paliwowych o mocy 1,2 kW. W obu badaniach wyznaczono wartości wskaźników eksploatacyjnych oraz ich różnice względem wielkości nominalnych.
    Źródło:
    Eksploatacja i Niezawodność; 2020, 22, 3; 530-535
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model development of integrated CPOx reformer and SOFC stack system
    Autorzy:
    Pianko-Oprych, P.
    Hosseini, S. M.
    Jaworski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/779855.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Catalytic Partial Oxidation (CPOx) reformer
    Solid Oxide Fuel Cell (SOFC) stack
    stead and dynamic mode
    modelling
    Opis:
    The main purpose of this study was to develop a mathematical model, in a steady state and dynamic mode, of a Catalytic Partial Oxidation (CPOx ) reformer – Solid Oxide Fuel Cell (SOFC) stack integrated system in order to assess the system performance. Mass balance equations were written for each component in the system together with energy equation and implemented into the MATLAB Simulink simulation tool. Temperature, gas concentrations, pressure and current density were computed in the steady-state mode and validated against experimental data. The calculated I–V curve matched well the experimental one. In the dynamic modelling, several different conditions including step changes in fuel flow rates, stack voltage as well as temperature values were applied to estimate the system response against the load variations. Results provide valuable insight into the operating conditions that have to be achieved to ensure efficient CPOx  performance for fuel processing for the SOFC stack applications.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 4; 41-46
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A review of the numerical studies on planar and tubular solid oxide fuel cells within four EU projects of the 7th framework programme
    Autorzy:
    Pianko-Oprych, P.
    Jaworski, Z.
    Zinko, T.
    Palus, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185086.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Solid Oxide Fuel Cell
    stack
    fuel cell system
    Computational Fluid Dynamics
    CFD
    Finite Element Method
    FEM
    modelling
    process simulation
    ogniwo paliwowe z tlenkiem stałym
    system ogniw paliwowych
    obliczeniowa dynamika płynów
    metoda elementów skończonych
    MES
    modelowanie symulacje procesu
    Opis:
    The paper addresses the issues of quantification and understanding of Solid Oxide Fuel Cells (SOFC) based on numerical modelling carried out under four European, EU, research projects from the 7FP within the Fuel Cell and Hydrogen Joint Undertaking, FCH JU, activities. It is a short review of the main projects’ achievements. The goal was to develop numerical analyses at a single cell and stack level. This information was integrated into a system model that was capable of predicting fuel cell phenomena and their effect on the system behaviour. Numerical results were analysed and favourably compared to experimental results obtained from the project partners. At the single SOFC level, a static model of the SOFC cell was developed to calculate output voltage and current density as functions of fuel utilisation, operational pressure and temperature. At the stack level, by improving fuel cell configuration inside the stack and optimising the operation conditions, thermal stresses were decreased and the lifetime of fuel cell systems increased. At the system level, different layouts have been evaluated at the steady-state and by dynamic simulations. Results showed that increasing the operation temperature and pressure improves the overall performance, while changes of the inlet gas compositions improve fuel cell performance.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 4; 377--393
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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