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    Wyświetlanie 1-14 z 14
    Tytuł:
    Energy management system of the hybrid ultracapacitor-battery electric drive vehicles
    Autorzy:
    Pielecha, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1832900.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicle
    battery
    ultracapacitor
    energy flow modeling
    pojazd elektryczny
    bateria
    ultrakondensator
    Opis:
    The search for new, alternative propulsion and energy sources in transport is one of the economic and technological priorities of the current decade. The modern development of hybrid drives and electric means of transport makes it possible to at least partially diversify conventional drive systems. The study discusses the use of a battery and ultracapacitor in electric vehicles. Simulation analyzes of energy flow were performed using the solutions of electric drive systems and various energy storage control algorithms. The research was carried out in relation to the use of braking energy, its con-version into electricity and its storage in a battery or ultracapacitor. The operating conditions of the battery and the ultra-capacitor were assessed in terms of specific energy consumption while driving. The article proposed the use of a drive system connected in series, the last link of which was an ultracapacitor. Such a solution significantly reduced the use of the battery as well as its regular charging-discharging. At the same time, it required the use of a high-capacity ultracapacitor, which contributed to increasing its charging time. The analyzes were carried out using standardized research tests as well as tests in real traffic conditions. The research was carried out with the use of the AVL Cruise software for the analysis of energy flow in vehicles; a middle class passenger vehicle was selected for the tests, equipped with an electrochemical battery and – in the next stage of the research – an ultracapacitor. Three research models were used: I) typical electric drive system; II) a system with the use of ultracapacitors ran by a simple control algorithm; III) a system with the use of ultracapacitors with an advanced control algorithm (the algorithm took into account the change of driving conditions to the ultracapacitor charging conditions). The advantages of using ultracapacitors in the electric drive of a vehicle were demonstrated, especially for results obtained in real traffic conditions. Analyzing the simulation tests results allowed to determine the most advantageous options of utilizing these systems, in particular in the aspect of increased possibilities of algorithms controlling the flow of electricity in the drive system.
    Źródło:
    Archives of Transport; 2021, 58, 2; 47-62
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conductance-controlled global-compensation-type shunt active power filter
    Autorzy:
    Szromba, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/140436.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    shunt active power filter
    active current
    indirect control method
    instantaneous compensation
    load equivalent conductance
    energy flow control
    Opis:
    This paper presents a load equivalent conductance based control method for a shunt active power filter. The principle of energy balance in the circuit, which means between supplying source - active filter - load, is used to obtain the control formula. The natural inertia of the active filter action is exploited, so no PI regulators are needed. The active filter can compensate for non-active current and, additionally, can stabilise the supplying source active power. In a case of generating loads energy harvesting is possible. The presented method is useful as well for voltage-source as current-source inverter based active filters, and for DC system as well as for AC single- or three-phase one.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 259-275
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy flows in PSII as an alternative indicator of winter damages of wheat plants: a mass-scale approach
    Autorzy:
    Sasal, M.
    Sniegowska, K.
    Rapacz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/81271.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    wheat plant
    winter damage
    stress reaction
    chlorophyll fluorescence
    energy flow
    winter hardiness
    freezing tolerance
    photosystem II
    leaf area
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of modular programming to characterize of functional features of the limited mechanisms of coupling
    Zastosowanie programu symulacji modułowej w procesie analizy charakterystyki sprzęgieł przeciążeniowych uwzględniającej ich właściwości funkcjonalne
    Autorzy:
    Broshchak, I.
    Lutsiv, I.
    Hurey, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/175825.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    limited mechanism
    modular design
    distributing module
    transmission module
    accumulation module
    energy flow
    mechanizm ograniczający
    konstrukcja modułowa
    moduł dystrybucji
    moduł transmisji
    moduł akumulacji
    przepływ energii
    Opis:
    The paper deals with the analysis of limited mechanisms construction designs exemplifying modern restricted couplings of world leading manufacturers. The description of limited mechanism structure as a technical system is given on the base of functional approach. The possibility of limited mechanisms separation into individual modules on the functional principle is proved. Main internal and external links between the elements of the technical system of limited mechanism are analyzed. These elements are proposed to be regarded as individual modules with the certain functions, characteristics and criteria.
    W pracy przedstawiono modele nowoczesnych ograniczających mechanizmów konstrukcyjnych na przykładzie sprzęgieł przeciążeniowych dostarczonych od wytwórców. Wykonano analizę charakterystyki badanych sprzęgieł uwzględniającą ich właściwości funkcjonalne. Stwierdzono możliwość zastosowania metody prowadzenia procesu projektowania poszczególnych mechanizmów konstrukcji sprzęgieł na podstawie analizy dostępnych modułów opracowanego programu. Stwierdzono przydatność wszystkich składowych programu symulacji numerycznej na podstawie zdefiniowanych przez użytkownika kryteriów funkcjonalnych, parametrów oraz wymagań konstrukcyjnych.
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 3; 33-43
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot Deformation Activation Energy of Metallic Materials Influenced by Strain Value
    Autorzy:
    Schindler, I.
    Opěla, P.
    Kawulok, P.
    Sauer, M.
    Rusz, S.
    Kuc, D.
    Rodak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049432.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flow stress curves
    steady state
    metallic materials
    hot deformation activation energy
    Opis:
    Suitable and complete sets of stress-strain curves significantly affected by dynamic recrystallization were analyzed for 11 different iron, copper, magnesium, titanium or nickel based alloys. Using the same methodology, apparent hot deformation activation energy Qp and Qss values were calculated for each alloy based on peak stress and steady-state stress values. Linear dependence between quantities Qp and Qss was found, while Qp values are on average only about 6% higher. This should not be essential in predicting true stress of a specific material depending on the temperature-compensated strain rate and strain.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 223-228
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New gas-liquid two-phase flow pattern maps based on the energy ratio of pressure fluctuation through a Venturi tube
    Autorzy:
    Sun, Zhiqiang
    Chen, Luyang
    Yao, Fengyan
    Powiązania:
    https://bibliotekanauki.pl/articles/220955.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas-liquid two-phase flow
    flow pattern map
    Venturi tube
    pressure fluctuation
    energy ratio
    ensemble empirical mode decomposition
    Opis:
    To find effective and practical methods to distinguish gas-liquid two-phase flow patterns, new flow pattern maps are established using the differential pressure through a classical Venturi tube. The differential pressure signal was first decomposed adaptively into a series of intrinsic mode functions (IMFs) by the ensemble empirical mode decomposition. Hilbert marginal spectra of the IMFs showed that the flow patterns are related to the amplitude of the pressure fluctuation. The cross-correlation method was employed to sift the characteristic IMF, and then the energy ratio of the characteristic IMF to the raw signal was proposed to construct flow pattern maps with the volumetric void fraction and with the two-phase Reynolds number, respectively. The identification rates of these two maps are verified to be 91.18% and 92.65%. This approach provides a cost-effective solution to the difficult problem of identifying gas-liquid flow patterns in the industrial field.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 241-252
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy of intrinsic mode function for gas-liquid flow pattern identification
    Autorzy:
    Sun, Z.
    Gong, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/221137.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas-liquid flow pattern
    flow-pattern map
    pressure fluctuation
    bluff body
    signal energy
    intrinsic mode function
    empirical mode decomposition
    Opis:
    Gas-liquid flows abound in a great variety of industrial processes. Correct recognition of the regimes of a gas-liquid flow is one of the most formidable challenges in multiphase flow measurement. Here we put forward a novel approach to the classification of gas-liquid flow patterns. In this method a flow-pattern map is constructed based on the average energy of intrinsic mode function and the volumetric void fraction of gas-liquid mixture. The intrinsic mode function is extracted from the pressure fluctuation across a bluff body using the empirical mode decomposition technique. Experiments adopting air and water as the working fluids are conducted in the bubble, plug, slug, and annular flow patterns at ambient temperature and atmospheric pressure. Verification tests indicate that the identification rate of the flow-pattern map developed exceeds 90%. This approach is appropriate for the gas-liquid flow pattern identification in practical applications.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 4; 759-766
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of V-Ti on Dynamic Recrystallization Behavior and Hot Deformation Activation Energy of 30MSV6 Micro-alloyed Steel
    Autorzy:
    Tavaei, K.
    Meysami, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353695.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic recrystallization
    activation energy
    hot compression
    30MSV6 micro-alloyed steel
    flow stress
    Opis:
    In the current study, the hot deformation of medium carbon V-Ti micro-alloyed steel was surveyed in the temperature range of 950 to 1150°C and strain rate range of 0.001 to 1 s-1 after preheating up to 1200°C with a compression test. In all cases of hot deformation, dynamic recrystallization took place. The influence of strain rate and deformation temperature on flow stress was analyzed. An increase in the strain rate and decrease in the deformation temperature postponed the dynamic recrystallization and increased the flow stress. The material constants of micro-alloyed steel were calculated based on the constitutive equations and Zener-Hollomon parameters. The activation energy of hot deformation was determined to be 458.75 kJ/mol, which is higher than austenite lattice self-diffusion activation energy. To study the influence of precipitation on dynamic recrystallization, the stress relaxation test was carried out in a temperature range of 950 to 1150°C after preheating up to 1200°C. The results showed no a stress drop while representing the interaction of particles with dynamic recrystallization.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 1195-1200
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Smart control of energy storage system in residential photovoltaic systems for economic and technical efficiency
    Autorzy:
    Kaczorowska, Dominika
    Rezmer, Jacek
    Janik, Przemysław
    Sikorski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2202548.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    economic efficiency
    energy storage system ESS
    microgrid management
    optimal power flow
    OPF
    particle swarm optimisation PSO
    Opis:
    In recent years, due to the increasing number of renewable energy sources, which are characterised by the stochastic nature of the generated power, interest in energy storage has increased. Commercial installations use simple deterministic methods with low economic efficiency. Hence, there is a need for intelligent algorithms that combine technical and economic aspects. Methods based on computational intelligence (CI) could be a solution. The paper presents an algorithm for optimising power flow in microgrids by using computational intelligence methods. This approach ensures technical and economic efficiency by combining multiple aspects in a single objective function with minimal numerical complexity. It is scalable to any industrial or residential microgrid system. The method uses load and generation forecasts at any time horizon and resolution and the actual specifications of the energy storage systems, ensuring that technological constraints are maintained. The paper presents selected calculation results for a typical residential microgrid supplied with a photovoltaic system. The results of the proposed algorithm are compared with the outcomes provided by a deterministic management system. The computational intelligence method allows the objective function to be adjusted to find the optimal balance of economic and technical effects. Initially, the authors tested the invented algorithm for technical effects, minimising the power exchanged with the distribution system. The application of the algorithm resulted in financial losses, €12.78 for the deterministic algorithm and €8.68 for the algorithm using computational intelligence. Thus, in the next step, a control favouring economic goals was checked using the CI algorithm. The case where charging the storage system from the grid was disabled resulted in a financial benefit of €10.02, whereas when the storage system was allowed to charge from the grid, €437.69. Despite the financial benefits, the application of the algorithm resulted in up to 1560 discharge cycles. Thus, a new unconventional case was considered in which technical and economic objectives were combined, leading to an optimum benefit of €255.17 with 560 discharge cycles per year. Further research of the algorithm will focus on the development of a fitness function coupled to the power system model.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 81--102
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative assesment of steady-state pipeline gas flow models
    Analiza porównawcza modeli przepływu gazu w rurociągu w stanach ustalonych
    Autorzy:
    Chaczykowski, M.
    Osiadacz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/963887.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pipeline gas flow
    steady-state flow model
    convective term
    kinetic energy term
    design flow equation
    GERG 2004 application
    transport rurociągowy
    ustalony przepływ gazu
    człon konwekcyjny
    człon energii kinetycznej
    równanie przepływu
    metoda GERG 2004
    Opis:
    One-dimensional, non-isothermal flow of gas in a straight pipe has been considered to predict pressure and temperature profiles along the horizontal pipeline under steady-state conditions. Selected analytical models for the simplified calculation of these profiles are evaluated on the basis of the numerical solution of the accurate model, which incorporates the convective term in the momentum equation and the kinetic energy term in the energy equation, while treating the enthalpy as a function of pressure and temperature. For closure of the system of the conservation equations, the GERG 2004 equation of state was chosen. In order to present the discrepancies introduced by the models, the results of the numerical and analytical solutions are compared with the field data. The results show that in the case of the high pressure gas transmission system, the effects of the convective term in the momentum equation and the kinetic energy term in the energy equation are negligible for pipeline pressure and temperature calculation accuracies. It also indicates that real gas effects play an important role in the temperature distribution along the pipeline and cannot be neglected from the calculation when approximate analytical equations are used.
    W artykule analizowano jednowymiarowy, nieizotermiczny przepływ gazu w stanie ustalonym w celu określenia zmian ciśnienia i temperatury w poziomym gazociągu. Wyniki uproszczonych obliczeń za pomocą wybranych modeli analitycznych zostały porównane z wynikami obliczeń uzyskanych za pomocą numerycznego całkowania modelu dokładnego, zawierającego człon konwekcyjny w równaniu pędu oraz człon energii kinetycznej w równaniu energii, jednocześnie przyjmując entalpię jako funkcję ciśnienia i temperatury. W celu zamknięcia układu równań zachowania zastosowano równanie stanu zgodnie z metodą GERG 2004. Dla przedstawienia niedokładności związanych z zastosowaniem różnych modeli, przeprowadzono weryfikację wyników na zbiorze danych rzeczywistych. Wyniki pokazują, że w przypadku systemów przesyłowych wysokiego ciśnienia, wpływ członu konwekcyjnego w równaniu pędu oraz członu energii kinetycznej w równaniu energii jest pomijalny z punktu widzenia dokładności obliczeń wartości ciśnienia i temperatury w gazociągu. Ponadto, wyniki pokazują, że prawidłowy opis właściwości gazu rzeczywistego odgrywa ważną rolę w obliczeniach zmian temperatury wzdłuż gazociągu i powinien być stosowany w przypadku przybliżonych metod analitycznych.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 1; 23-38
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Temperature Deformation Flow Of A ZK60A Magnesium Alloy After Extrusion
    Płynięcie stopu magnezu ZK60A podczas wysokotemperaturowego odkształcenia w trakcie wytłaczania
    Autorzy:
    Kawasaki, M.
    Lee, H. J.
    Oh, M. C.
    Ahn, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/354374.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    activation energy
    extrusion
    flow mechanics
    magnesium alloy
    tensile property
    energia aktywacji
    wytłaczanie
    mechanika przepływu
    stop magnezu
    rozciąganie
    Opis:
    Flow behavior of a ZK60A magnesium alloy after continuous casting and subsequent extrusion was examined in tension at a range of strain rates of 3.0×10-6 − 1.0×10-2 s-1 at temperatures of 473-623K. The results demonstrated that the alloy exhibited a maximum elongation of ~250% at 523K when tested at an initial strain rate of 1.0×10-5 s-1 and strain rate sensitivity, m, of ~0.3-0.4 and the activation energy of ~94 kJ/mol were calculated under the testing conditions. The detailed investigation suggested that the high temperature flow of the ZK60A alloy having submicrometer grains demonstrates quasi-superplastic flow behavior controlled by a dislocation viscous glide process.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2B; 1327-1330
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress-strain curves under compression for CMSX4 nickel based superalloy
    Krzywe odkształcania nadstopu CMSX-4 po próbie ściskania w wysokiej temperaturze
    Autorzy:
    Nowotnik, A.
    Pędrak, P.
    Rokicki, P.
    Mrówka-Nowotnik, G.
    Sieniawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175597.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    flow stress
    plastic deformation
    CMSX4
    superalloys
    activation energy
    krzywe płynięcia
    odkształcenie plastyczne
    nadstopy niklu
    CMSX-4
    energia aktywacji
    Opis:
    Variations of a flow stress vs. true strain illustrate behavior of material during plastic deformation. Stress-strain relationship is generally evaluated by a torsion, compression and tensile tests. Results of these tests provide crucial information pertaining to the stress values which are necessary to run deformation process at specified deformation parameters. Uniaxial compression tests at the temperature through which precipitation hardening phases process occurred (900-1200°C), were conducted on superalloy - CMSX-4, to study the effect of temperature and strain rate (ε =10 to the -4 and 4x10 to the -4 s to the -1) on its flow stress. On the basis of received flow stress values activation energy of a high-temperature deformation process was estimated. Mathematical dependences (σpl - τ i σpl - ε) and compression data were used to determine material's constants. These constants allow to derive a formula that describes the relationship between strain rate (ε), deformation temperature (τ) and flow stress σpl - ε = A1σ to the n ∙ exp(-Q / RT).
    Zachowanie się materiału podczas odkształcania plastycznego na gorąco charakteryzują krzywe zmiany naprężenia uplastyczniającego w funkcji odkształcenia. Do ich oceny stosowane są próby skręcania, ściskania lub rozciągania. Pozwalają określić dane niezbędne do prowadzenia procesu przeróbki plastycznej materiału z zastosowaniem odpowiednich parametrów odkształcania - temperatury i prędkości chłodzenia. W pracy przedstawiono analizę wyników badań wpływu temperatury i prędkości odkształcania (ε = 10 do - 4 i 4 x 10 do -4 s do -1) na wartość naprężenia uplastyczniającego nadstopu niklu - CMSX-4 w zakresie wartości temperatury wydzielania cząstek faz umacniających (900-1200°C) uzyskane w jednoosiowej próbie ściskania. Ustalone wartości naprężenia uplastyczniającego były podstawą do wyznaczenia energii aktywacji Q procesu odkształcania wysokotemperaturowego. Na podstawie uzyskanych danych oraz odpowiednich zależności (σpl - τ i σpl - ε) określono wartości stałych materiałowych oraz ustalono zależność prędkości (ε), temperatury odkształcenia (τ) i naprężeniem ustalonego płynięcia plastycznego σpl - ε = A1σ do n ∙ exp(-Q / RT).
    Źródło:
    Advances in Manufacturing Science and Technology; 2014, 38, 3; 65-77
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of operation problems at a 200 MWe PF boiler
    Autorzy:
    Peta, S.
    Toit, C. du
    Naidoo, R.
    Schmitz, W.
    Jestin, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/185774.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    process flow modeling
    mass and energy balance
    furnace CFD modeling
    PF swirl burner
    proces modelowania przepływu
    bilans masy i energii
    modelowanie pieca CFD
    Opis:
    To minimize oxides of nitrogen (NOx) emission, maximize boiler combustion efficiency, achieve safe and reliable burner combustion, it is crucial to master global boiler and at-the-burner control of fuel and air flows. Non-uniform pulverized fuel (PF) and air flows to burners reduce flame stability and pose risk to boiler safety by risk of reverse flue gas and fuel flow into burners. This paper presents integrated techniques implemented at pilot ESKOM power plants for the determination of global boiler air/flue gas distribution, wind-box air distribution and measures for making uniform the flow being delivered to burners within a wind-box system. This is achieved by Process Flow Modelling, at-the-burner static pressure measurements and CFD characterization. Global boiler mass and energy balances combined with validated site measurements are used in an integrated approach to calculate the total (stoichiometric + excess) air mass flow rate required to burn the coal quality being fired, determine the actual quantity of air that flows through the burners and the furnace ingress air. CFD analysis and use of at-the-burner static, total pressure and temperature measurements are utilized in a 2-pronged approach to determine root-causes for burner fires and to evaluate secondary air distribution between burners.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 3; 305-320
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Mathematical Model of Membrane Gas Separation with Energy Transfer by Molecules of Gas Flowing in a Channel to Molecules Penetrating this Channel from the Adjacent Channel
    Autorzy:
    Szwast, M.
    Szwast, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/185043.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    membrane
    membrane module
    reciprocal transfer of energy between gas molecules
    changes of the pressure of gas along the length of flow channel
    membrana
    wzajemne przekazywanie energii między cząsteczkami gazu
    zmiany ciśnienia gazu na długości kanału przepływowego
    Opis:
    The paper presents the mathematical modelling of selected isothermal separation processes of gaseous mixtures, taking place in plants using membranes, in particular nonporous polymer membranes. The modelling concerns membrane modules consisting of two channels – the feeding and the permeate channels. Different shapes of the channels cross-section were taken into account. Consideration was given to co-current and counter-current flows, for feeding and permeate streams, respectively, flowing together with the inert gas receiving permeate. In the proposed mathematical model it was considered that pressure of gas changes along the length of flow channels was the result of both – the drop of pressure connected with flow resistance, and energy transfer by molecules of gas flowing in a given channel to molecules which penetrate this channel from the adjacent channel. The literature on membrane technology takes into account only the drop of pressure connected with flow resistance. Consideration given to energy transfer by molecules of gas flowing in a given channel to molecules which penetrate this channel from the adjacent channel constitute the essential novelty in the current study. The paper also presents results of calculationsobtained by means of a computer program which used equations of the derived model. Physicochemical data concerning separation of the CO2/CH4 mixture with He as the sweep gas and data concerning properties of the membrane made of PDMS were assumed for calculations.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 151-169
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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