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Wyszukujesz frazę "thermodynamic optimization" wg kryterium: Temat

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Optimization of idealized ORC in domestic combined heat and power generation
    Autorzy:
    Rybiński, W.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240921.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ORC
    CHP
    thermodynamic optimization
    endoreversible
    optymalizacja termodynamiczna
    Opis:
    Organic Rankine cycle (ORC) is used, amongst the others, in geothermal facilities, in waste heat recovery or in domestic combined heat and power (CHP) generation. The paper presents optimization of an idealized ORC equivalent of the Carnot cycle with non-zero temperature difference in heat exchangers and with energy dissipation caused by the viscous fluid flow. In this analysis the amount of heat outgoing from the ORC is given. Such a case corresponds to the application of an ORC in domestic CHP. This assumption is different from the most of ORC models where the incoming amount of heat is given.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 137-146
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical thermodynamic optimization of supercritical coal fired power plant with support of IPSEpro software
    Autorzy:
    Elsner, W.
    Kowalczyk, Ł.
    Marek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240118.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja termodynamiczna
    siłownia nadkrytyczna
    symulacja
    wydajność
    efficiency
    simulation
    supercritical power plant
    thermodynamic optimization
    Opis:
    The paper presents a thermodynamic optimization of supercritical coal fired power plant. The aim of the study was to optimize part of the thermal cycle consisted of high-pressure turbine and two chosen high-pressure feed water heaters. Calculations were carried out using IPSEpro software combined with MATLAB, where thermal efficiency and gross power generation efficiency were chosen as objective functions. It was shown that the optimization with newly developed framework is sufficiently precise and its main advantage is the reduction of computation time on comparison to the classical method. The calculations have shown the tendency of the increase in efficiency, with the rise of a number of function variables.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 3; 101-110
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-parametric and multi-objective thermodynamic optimization of a spark-ignition range extender ICE
    Autorzy:
    Toman, R.
    Brankov, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/243112.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    Range Extender
    hybrid electric vehicle
    battery electric vehicle
    internal combustion engine
    spark ignition
    thermodynamic optimization
    genetic algorithm
    Opis:
    The current legislation pushes for the increasing level of vehicle powertrain electrification. A series hybrid electric vehicle powertrain with a small Range Extender (REx) unit – comprised of an internal combustion engine and an electric generator – has the technical potential to overcome the main limitations of a pure battery electric vehicle: driving range, heating, and air-conditioning demands. A typical REx ICE operates only in one or few steady-states operating points, leading to different initial priorities for its design. These design priorities, compared to the conventional ICE, are mainly NVH, package, weight, and overall concept functional simplicity – hence the costeffectiveness. The design approach of the OEMs is usually rather conservative: parting from an already-existing ICE or components and adapting it for the REx application. The fuel efficiency potential of a one-point operation of the REx ICE is therefore not fully exploited. This article presents a multi-parametric and multi-objective optimization study of a REx ICE. The studied ICE concept uses a well-known and proven technology with a favourable production and development costs: it is a two-cylinder, natural aspirated, port injected, four-stroke SI engine. The goal of our study is to find its thermodynamic optimum and fuel efficiency potential for different feasible brake power outputs. Our optimization tool-chain combines a parametric GT-Suite ICE simulation model and modeFRONTIER optimization software with various optimization strategies, such as genetic algorithms, gradient based methods or various hybrid methods. The optimization results show a great fuel efficiency improvement potential by applying this multi-parametric and multi-objective method, converging to interesting short-stroke designs with Miller valve timings.
    Źródło:
    Journal of KONES; 2018, 25, 3; 459-466
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance optimization of organic Rankine cycles for waste heat recovery for a large diesel engine
    Autorzy:
    Ma, Z.
    Wu, J.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/240064.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low grade waste heat
    organic rankine cycle
    thermodynamic optimization
    thermoeconomic optimization
    intelligent marine diesel engine
    organiczny obieg Rankine'a
    optymalizacja termodynamiczna
    optymalizacja termoekonomiczna
    Opis:
    In order to recover the low grade waste heat and increase system fuel economy for main engine 10S90ME-C9.2-TII(part load, exhaust gas bypass) installed on a 10000 TEU container ship, a non-cogeneration and single-pressure type of waste heat recovery system based on organic Rankine cycle is proposed. Organic compound candidates appropriate to the system are analyzed and selected. Thermodynamic model of the whole system and thermoeconomic optimization are performed. The saturated organic compound vapor mass flow rate, net electric power output, pinch point, thermal efficiency and exergy efficiency varied with different evaporating temperature are thermodynamically analyzed. The results of thermodynamic and thermoeconomic optimization indicate that the most appropriate organic compound candidate is R141b due to its highest exergy efficiency, biggest unit cost benefit and shortest payback time.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 1; 3-23
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic analysis of medium pressure reciprocating natural gas expansion engines
    Autorzy:
    Farzaneh-Gord, M.
    Izadi, S.
    Pishbin, S. I.
    Sheikhani, H.
    Deymi-Dashtebayaz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/777996.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Expansion engine
    thermodynamic
    first law
    optimization
    ideal gas model
    Opis:
    Natural gas pressure has to be reduced from medium pressure of 1.724 MPa (250 psia) to lower pressure of 0.414 MPa (60 psia) at Town Border pressure reduction Station (TBS). Currently, the pressure reduction is carried out by throttling valves while considerable amount of pressure energy is wasted. One of the equipment which could be used to recover this waste energy is the reciprocating expansion engine. The purpose of this research is to simulate one-sided reciprocating expansion engine thermodynamically for TBS pressure range. The simulation is based on first law of thermodynamics, conversation of mass and ideal gas assumptions. The model could predict in-cylinder pressure and in-cylinder temperature at various crank angles. In addition, the effects of the engine geometrical characteristics, such as intake and exhaust port area and ports timing on the Indicated work per cycle output are investigated.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 2; 119-125
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing the shape of a compression-ignition engine combustion chamber by using simulation tests
    Autorzy:
    Pielecha, Ireneusz
    Merkisz, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/962691.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    CI engine combustion system
    combustion process thermodynamic analysis
    combustion chamber optimization
    Opis:
    Modern solutions used in compression-ignition internal combustion engines are quite similar to each other. The use of high-pressure, direct fuel injection results in high combustion rates with controlled exhaust emissions. One of the combustion system quality criteria is to obtain adequately high thermodynamic indicators of the combustion process, which are obtained through, among others, the right combustion chamber geometry. Its shape influences the fuel atomization process, turbulence of fuel dose, evaporation and the combustion process. Optimizing the combustion chamber shape is one of the decisive factors proving the correct execution of the combustion process. This article presents the methodology of choosing the combustion chamber shape (changes of three selected combustion chamber dimensions) by using the optimization methods. Generating multidimensional data while maintaining the correlation structure was performed by using the Latin hypercube method. Chamber optimization was carried out by using the Nelder-Mead method. The combustion chamber shape was optimized for three engine load values (determined by the average indicated pressure) at selected engine operating conditions. The presented method of engine combustion chamber optimization can be used in low and high speed diesel propulsion engines (especially in maritime transport applications).
    Źródło:
    Polish Maritime Research; 2019, 3; 138-146
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prechamber optimal selection for a two stage turbulent jet ignition type combustion system in CNG-fuelled engine
    Autorzy:
    Pielecha, Ireneusz
    Bueschke, Wojciech
    Skowron, Maciej
    Fiedkiewicz, Łukasz
    Szwajca, Filip
    Powiązania:
    https://bibliotekanauki.pl/articles/133967.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    gas engine
    prechamber
    thermodynamic analysis
    combustion
    exhaust emission
    optimization
    silnik gazowy
    komora wstępna
    analiza termodynamiczna
    spalanie
    emisja spalin
    optymizacja
    Opis:
    Searching for further reduction of fuel consumption simultaneously with the reduction of toxic compounds emission new systems for lean-mixture combustion for SI engines are being discussed by many manufacturers. Within the European GasOn-Project (Gas Only Internal Combustion Engines) the two-stage combustion and Turbulent Jet Ignition concept for CNG-fuelled high speed engine has been proposed and thoroughly investigated where the reduction of gas consumption and increasing of engine efficiency together with the reduction of emission, especially CO2 was expected. In the investigated cases the lean-burn combustion process was conducted with selection of the most effective pre-combustion chamber. The experimental investigations have been performed on single-cylinder AVL5804 research engine, which has been modified to SI and CNG fuelling. For the analysis of the thermodynamic, operational and emission indexes very advanced equipment has been applied. Based on the measuring results achieved for different pre-chamber configurations the extended methodology of polioptimization by pre-chamber selection and the shape of main chamber in the piston crown for proposed combustion system has been described and discussed. The results of the three versions of the optimization methods have been comparatively summarized in conclusions.
    Źródło:
    Combustion Engines; 2019, 58, 1; 16-26
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a method for finding the optimal solution when upgrading a motorcycle engine
    Autorzy:
    Vrublevskyi, Oleksandr
    Wojnowski, Radomir
    Powiązania:
    https://bibliotekanauki.pl/articles/298245.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    spark ignition engine
    thermodynamic cycle simulations
    optimization
    design of experiments
    DoE
    Monte Carlo method
    Nonlinear Programming Quadratic Line search
    NLPQL
    Opis:
    This paper describes a method for finding the optimal parameters of a spark-ignition engine gas exchange system for a motorcycle. The vectors of the initial data for filling the parameter space, in which the search for the optimal solution has been made, have been formed through methods of experiment planning and technique nonlinear programming quadratic line search. As the quality criteria, the engine power has been used at selected points of the external speed characteristic. The results of the work have shown how using the proposed optimization method allows modernization of a gas exchange systems in order to increase the engine power.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(2); 135-149
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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