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    Wyświetlanie 1-8 z 8
    Tytuł:
    The influence of external cooling system on the performance of supercritical steam turbine cycles
    Autorzy:
    Kosman, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/240233.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    para nadkrytyczna
    schładzanie
    turbina parowa
    wydajność
    cooling
    efficiency
    steam turbine
    supercritical steam
    Opis:
    The problem presented in this paper refers to the concepts applied to the design of supercritical steam turbines. The issue under the investigation is the presence of a cooling system. Cooling systems aim to protect the main components of the turbines against overheating. However the cooling flows mix with the main flow and modify the expansion line in the steam path. This affects the expansion process in the turbine and changes the performance when compared to the uncooled turbine. The analysis described here investigates the range of the influence of the cooling system on the turbine cycle. This influence is measured mainly through the change of the power generation efficiency. The paper explains the approach towards the assessment of the cooling effects and presents results of the modeling for three supercritical steam cycles.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 3; 131-144
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of start energy of Stirling engine type alpha
    Autorzy:
    Kropiwnicki, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/240606.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Stirling engines
    system efficiency
    low temperature supply
    silniki Sterlinga
    wydajność systemu
    zasilanie
    niska temperatura
    Opis:
    The Stirling engine type alpha is composed of two cylinders (expansion space E and compression space C), regenerator that forms the space between the cylinders and the buffer space (under the pistons). Before the start-up and as a result of long-term operation, the average pressure in the working space (above the pistons) and in the buffer space is the same. However, in the initial phase of operation, the average pressure in the working space is different then the average pressure in the buffer space depending on the crankshaft starting position (starting angle). This, in turn, causes a large variation in the starting torque. An additional unfavorable factor caused by a large variation in the course of the indicated torque is the rotational speed variation and the formation of torsional vibrations in the drive system. After some time, depending on the quality of the engine piston sealing, the average pressure in the working and buffer space will equalize. The occurrence of the above-described phenomenon affects the selection of the starting electric motor, which can be significantly reduced, when the crankshaft starting position is optimized (the starting torque is several times greater than the average torque occurring in the generator operation mode). This paper presents the analysis of the impact of the crankshaft starting position on the course of the indicated torque and the resulting start-up energy. Starting the engine at an unfavorable position of the crankshaft may, in extreme cases, increase the starting torque even three times.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 3; 243-259
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of moisture content of combusted wood on the thermal efficiency of a boiler
    Autorzy:
    Dzurenda, L.
    Banski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/239999.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    boiler
    wood
    combustion
    thermal efficiency
    mathematical dependence
    bojler
    drewno
    spalanie
    wydajność termiczna
    matematyczna zależność
    Opis:
    In the paper the influence of moisture content of wood on the heat losses and thermal efficiency of a boiler is analysed. The moisture content of wood has a negative effect, especially on flue gas loss. The mathematical dependence of the thermal efficiency of a boiler is presented for the following boundary conditions: the moisture content of wood 10–60%, range of temperatures of emitted flue gases from the boiler into the atmosphere 120–200 C, the emissions meeting the emission standards: carbon monoxide 250 mgm-3, fly ash 50 mgm-3 and the heat power range 30–100%.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 1; 63-74
    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:
    The effect of different organic fluids on performances of binary slag washing water power plants
    Autorzy:
    Li, Z.
    Liu, Y.
    Dong, P.
    Zhang, Y.
    Xiao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240438.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    slag washing water
    efficiency
    organic fluids
    binary power cycle
    wydajność
    płyn organiczny
    podwójny cykl zasilania
    Opis:
    In this paper, 3 typical organic fluids were selected as working fluids for a sample slag washing water binary power plants. In this system, the working fluids obtain the thermal energy from slag washing water sources. Thus, it plays a significant role on the cycle performance to select the suitable working fluid. Energy and exergy efficiencies of 3 typical organic fluids were calculated. Dry type fluids (i.e., R227ea) showed higher energy and exergy efficiencies. Conversely, wet fluids (i.e., R143a and R290) indicated lower energy and exergy efficiencies, respectively.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 3; 49-62
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of waste heat energy sources of a conventional steam propulsion plant of an LNG carrier
    Autorzy:
    Adamkiewicz, Andrzej
    Grzesiak, Szymon
    Powiązania:
    https://bibliotekanauki.pl/articles/240754.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    waste heat energy
    steam turbine
    efficiency
    propulsion plant
    energia cieplna odpadowa
    silnik parowy
    wydajność
    instalacja napędowa
    Opis:
    This paper presents the origins of marine steam turbine application on liquefied natural gas carriers. An analysis of alternative propulsion plant trends has been made. The more efficient ones with marine diesel engines gradually began to replace the less efficient plants. However, because of many advantages of the steam turbine, further development research is in progress in order to achieve comparable thermal efficiency. Research has been carried out in order to achieve higher thermal efficiency throughout increasing operational parameters of superheated steam before the turbine unit; improving its efficiency to bring it nearer to the ideal Carnot cycle by applying a reheating system of steam and multi stage regenerative boiler feed water heating. Furthermore, heat losses of the system are reduced by: improving the design of turbine blades, application of turbine casing and bearing cooling, as well as reduction in steam flow resistance in pipe work and maneuvering valves. The article identifies waste energy sources using the energy balance of a steam turbine propulsion plant applied on the liquefied natural gas carrier which was made out basing on results of a passive operation experiment, using the measured and calculated values from behavioral equations for the zero-dimensional model. Thermodynamic functions of state of waste heat fluxes have been identified in terms of their capability to be converted into usable energy fluxes. Thus, new ways of increasing the efficiency of energy conversion of a steam turbine propulsion plant have been addressed.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 3; 195-210
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Steady-state and transient heat transfer through fins of complex geometry
    Autorzy:
    Taler, D.
    Taler, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240664.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fin of complex geometry
    fin efficiency
    finite volume method
    finite element method
    geometria złożona
    wydajność
    metoda objętości skończonych
    metoda elementów skończonych
    Opis:
    Various methods for steady-state and transient analysis of temperature distribution and efficiency of continuous-plate fins are presented. For a constant heat transfer coefficient over the fin surface, the plate fin can be divided into imaginary rectangular or hexangular fins. At first approximate methods for determining the steady-state fin efficiency like the method of equivalent circular fin and the sector method are discussed. When the fin geometry is complex, thus transient temperature distribution and fin efficiency can be determined using numerical methods. A numerical method for transient analysis of fins with complex geometry is developed. Transient temperature distributions in continuous fins attached to oval tubes is computed using the finite volume - finite element methods. The developed method can be used in the transient analysis of compact heat exchangers to calculate correctly the heat flow rate transferred from the finned tubes to the fluid.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 2; 117-133
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time performance of RGB to HSI colour space transformation methods
    Autorzy:
    Ziemba, A.
    Fornalik-Wajs, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/240294.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital image processing
    optical measurement method
    RGB to HSI colour space transformation
    linear transformation
    time performance
    relative computational time
    przetwarzanie
    obraz cyfrowy
    przekształcenia liniowe
    czas
    wydajność
    Opis:
    Present paper is a continuation of works on evaluation of red, green, blue (RGB) to hue, saturation, intensity (HSI) colour space transformation in regard to digital image processing application in optical measurements methods. HSI colour space seems to be the most suitable domain for engineering applications due to its immunity to non-uniform lightning. Previous stages referred to the analysis of various RGB to HSI colour space transformations equivalence and programming platform configuration influence on the algorithms execution. The main purpose of this step is to understand the influence of computer processor architecture on the computing time, since analysis of images requires considerable computer resources. The technical development of computer components is very fast and selection of particular processor architecture can be an advantage for fastening the image analysis and then the measurements results. In this paper the colour space transformation algorithms, their complexity and execution time are discussed. The most common algorithms were compared with the authors own one. Computing time was considered as the main criterion taking into account a technical advancement of two computer processor architectures. It was shown that proposed algorithm was characterized by shorter execution time than in reported previously results.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 1; 111-128
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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