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    Wyświetlanie 1-4 z 4
    Tytuł:
    Evaluation of technical efficiency of heat and electric power generation
    Autorzy:
    Piwowarska, H.
    Piwowarski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/259361.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Data Envelopment Analysis (DEA)
    technical efficiency
    Malmquist index
    thermal power generation
    Opis:
    This paper presents an evaluation of technical efficiency and time-dependent changes in productivity of Polish professional electric power and heat & electric power stations by using Data Envelopment Analysis non-parametric method. The research covered the enterprises whose total available electric power amounted to about 98% of that of all professional thermal electric power stations in this country. The analysis has concerned the years 2000÷2004. Impact was considered of such factors as: scale of enterprise activity, form of ownership as well as type of carried out activity, on technical efficiency and time-dependent productivity changes. Changes in productivity of the power generation sector were determined by means of Malmquist index.
    Źródło:
    Polish Maritime Research; 2009, S 1; 39-44
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected problems of determining an efficient operation standard in contemporary heat-and-flow diagnostics
    Autorzy:
    Głuch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259296.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    steam turbines
    operation of turbines
    power units
    thermal measurements
    thermal diagnostics
    diagnostic relations
    Opis:
    In this paper are specified causes of ambiguities and difficulties in determining an efficient operation standard for land and marine turbine power plants. Two of them, namely: lowering values of working media inlet parameters and changes in configuration of connections between component devices of thermal cycles, have been analyzed. As a remedy for resulting difficulties a thermal cycle computational model of modular structure has been proposed. As showed, the tuning of the computational model with respect to correct measurements by elaborating individual corrections for calculation coefficients of computational methods used for particular devices ensures good accuracy of determination of unserviceability symptoms in these conditions. Introduction to the modular computational model – of control modules making use of valve opening indicators in DCS system ensures good accuracy also in the case of changes in structure of complex power object.
    Źródło:
    Polish Maritime Research; 2009, S 1; 22-27
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault detection in measuring systems of power plants
    Autorzy:
    Głuch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/258570.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    steam turbines
    turbines exploitation
    power units
    efficiency
    thermal diagnostics
    diagnostic relations
    Opis:
    This paper describes possibility of forming diagnostic relations based on application of the artifical neural networks (ANNs), intended for the identifying of degradation of measuring instruments used in developed power systems. As an example a steam turbine high-power plant was used. And, simulative calculations were applied to forming diagnostic neural relations. Both degradation of the measuring instruments and simultaneously occurring degradation of the measuring instruments and thermal cycle component devices, were taken into account. Good quality of diagnostic neural relations was stated. They make it possible to distinguish degradation of measuring instruments from degradation of thermal cycle components. The calculated errors of identification of dergraded devices and measuring instruments in the case of simultaneous occurence of three different degradations were on the level of 0.25 %. Performance of the relations was presented by using an example based on industrial practice.
    Źródło:
    Polish Maritime Research; 2008, 4; 45-51
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative analysis of energy potential of three ways of configuration of a condenser power plant thermal cycle
    Autorzy:
    Chmielniak, T.
    Krzyślak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/258540.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    Comparative analysis of energy
    condenser
    power plant
    thermal cycle
    new regeneration
    separation preheater
    Opis:
    A theoretical, comparative analysis of three configuration ways of a condenser power plant thermal cycle is shown in the work. A new regeneration & separation preheater and its application in a thermal cycle is presented. Results obtained allow to compare all three analysed configurations efficiencies.
    Źródło:
    Polish Maritime Research; 2008, 4; 30-36
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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