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    Wyświetlanie 1-3 z 3
    Tytuł:
    Selected technical aspects of managing efficient heat supply in a district heating system
    Autorzy:
    Wrzalik, Aleksandra
    Powiązania:
    https://bibliotekanauki.pl/articles/29521087.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    district heating
    heat transmission
    district heating main
    flow velocity
    heat losses
    pressure losses
    efficiency
    Opis:
    District heating networks are key components of efficient heat supply systems for municipal and industrial consumers. The purpose of the research presented in this article was to analyze the thermo-hydraulic parameters of the operation of a transmission main in a district heating network to improve the heat transfer efficiency. Based on a literature review of existing studies, the basic issues of the heat supply process were discussed, and selected methods and tools for simulating district heating networks were characterized. A detailed mathematical description of the phenomena occurring during heat transport in a district heating network pipeline was also presented. Then, analytical calculations and simulations were carried out for the selected district heating system using Termis software. Operational parameters collected in the actual district heating system were used as output data for analytical modeling. Pressure drops, power losses, and heat transfer efficiencies in the main buses at different outdoor temperatures during the heating season were determined. Selected results of the study were included, and possibilities for improving the efficiency of heat transfer in the studied district heating network were indicated.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 76 (148); 32-41
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    K ispolzovaniju termodynamiceskih metodov dla analiza effektivnosti utilizacii tepla uhodasih gazov glavnyh dvigatelej
    Thermodynamic Methods for the Analysis of Efficiency of Utilization of Main Engines Exhaust Gases Heat
    Autorzy:
    Behrendt, C.
    Motornyj, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/359006.pdf
    Data publikacji:
    2005
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    OMiUO 2005
    ship power plant
    main engine
    factor of efficiency
    utilization of exhaust gases heat
    Opis:
    It has been shown that the concept of exergue can be used in the analysis of thermo-dynamic efficiency. The concept incorporates both principles of thermodynamics. The factor of exergue efficiency is shown. The developed technique of defining the values of exergue losses occurring at the utilization of heat of internal combustion engine exhaust gases is based. The technique is based on the entropy method. The obtained dependences determining the influence of various factors have been presented as well.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2005, 5 (77); 22-37
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The development of long-range heat transfer surfaces for marine diesel engine charge air coolers
    Autorzy:
    Kuznetsov, Valerii
    Gogorenko, Oleksiy
    Kuznetsova, Svetlana
    Powiązania:
    https://bibliotekanauki.pl/articles/1818882.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    marine diesel engines
    charge air cooler
    heat transfer surface
    efficiency
    finns
    dimples
    nonround cross section tube
    Opis:
    Charge air cooling is essential for the efficient operation of marine diesel engines. This work presents the results of research on the characteristics of long-range heat transfer surfaces for marine diesel engines. Elliptical and flat-oval tubes were considered. This study was carried out using mathematical models that consisted of the equations for energy conservation, motion, continuity, and state. The RSM turbulence model was used to close the system of equations. To solve the resulting system of equations, the RANS approach was used, which was implemented in the software package Code Saturne with a free license and the SimScale cloud service. The mathematical model was verified by comparing the model results with the experimental results obtained using a prototype heat-exchange surface of a charge air cooler at a test bench. The discrepancy between the theoretical and experimental heat transfer coefficient α was ≤ 8.3%. An estimate of the compactness of smooth elliptical and flat-oval tube banks compared with round ones was carried out. A 19.6% increase in compactness was obtained for elliptical tubes and 17.5% for flat-oval tubes. Based on the profiled finning surfaces, it is possible to improve their thermohydraulic characteristics by up to 40% when using them together with elliptical tubes compared with round ones and up to 26% when using them with flat-oval tubes.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2021, 65 (137); 51-57
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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