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Wyszukujesz frazę "conduction coefficient" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Calculation of the thermal dynamic performance of the residential buildings walls
    Autorzy:
    Kalinović, Saša M.
    Djoković, Jelena M.
    Nikolić, Ružica R.
    Hadzima, Branislav
    Powiązania:
    https://bibliotekanauki.pl/articles/104140.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wall's specific mass
    heat conduction coefficient
    periodical heat transfer
    reduction factor
    thermal inertia
    ściany
    współczynnik przewodzenia ciepła
    okresowe przekazywanie ciepła
    współczynnik redukcji
    bezwładność cieplna
    Opis:
    Calculation of the thermal dynamic properties of the multi-layer wall isolation of residential buildings is presented in this paper. Taking into account that the final objective is to create a building with the highest energy efficiency ratio, i.e. with the lowest energy consumption, both for heating and cooling, it is necessary to realize the good thermal characteristics of the multi-layer wall. To obtain the optimal solution for the wall's structure, various wall structures with different thicknesses of the individual layers, were analyzed. Based on results, presented in this paper, one can conclude that for walls with the same total thickness, but various thicknesses of the individual layers, that constitute the complete wall structure, the differences appear in the delay of the change of the walls outside temperature. In that way, by varying those individual layers' thicknesses, one can obtain the optimal solution for the wall structure with the highest savings of energy.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 212-221
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the average and local boundary condition of heat transfer during cooling with a water spray under surface boiling
    Autorzy:
    Jasiewicz, Elżbieta
    Hadała, Beata
    Malinowski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/29520235.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    water spray cooling
    heat transfer coefficient
    heat flux
    inverse problem
    heat conduction equation
    Opis:
    The study determined the local and average heat transfer coefficient and the heat flux on the surface of a cylinder cooled with a water nozzle. The inverse method was used to identify the heat transfer coefficient. An objective function was defined to determine the distance between the measured and calculated temperatures. Two models describing the heat transfer coefficient on the cooled surface were considered. The first model described changes in the heat transfer coefficient as a function of the sample radius and cooling time, and the second one assumed the dependence of the heat transfer coefficient solely on time. Numerical simulations showed significant differences in the determined heat transfer coefficients depending on the adopted model of the boundary condition. The performed tests included experimental temperature measurements at selected points of the sensor, numerical simulations of temperature changes, and the inverse solution.
    Źródło:
    Computer Methods in Materials Science; 2020, 20, 4; 147-155
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of Beck’s method combined with FEM and Trefftz functions to determine the heat transfer coefficient in a minichannel
    Autorzy:
    Maciejewska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/281153.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Beck’s method
    FEM
    Trefftz functions
    heat transfer coefficient
    inverse heat conduction problem
    flow boiling
    Opis:
    The aim of this study is to determine the heat transfer coefficient between the heated surface and the boiling fluid flowing in a minichannel on the basis of experimental data. The calculation model is based on Beck’s method coupled with the FEM and Trefftz functions. The Trefftz functions used in the Hermite interpolation are employed to construct the shape functions in the FEM. The unknown local values of the heat transfer coefficient at the foil- -fluid contact surface are calculated from Newton’s law. The temperature of the heated foil and the heat flux on the foil surface are determined by solving a two-dimensional inverse heat conduction problem. The study is focused on the identification of the heat transfer coefficients in the subcooled boiling region and the saturated nucleate boiling region. The results are compared with the data obtained through the one-dimensional method. The investigations also reveal how the smoothing of measurement data affects calculation results.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 1; 103-116
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the Thermal Conductivity Coefficient in the Heat Conduction Model with Fractional Derivative
    Autorzy:
    Brociek, R.
    Słota, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382791.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat conduction equation
    thermal conductivity coefficient
    inverse problem
    fractional derivative
    thermal conductivity
    model przewodzenia ciepła
    współczynnik przewodzenia ciepła
    problem odwrotny
    pochodna ułamkowa
    przewodność termiczna
    Opis:
    Main goal of the paper is to present the algorithm serving to solve the heat conduction inverse problem. Authors consider the heat conduction equation with the Riemann-Liouville fractional derivative and with the second and third kind boundary conditions. This type of model with fractional derivative can be used for modelling the heat conduction in porous media. Authors deal with the heat conduction inverse problem, which, in this case, consists in identifying an unknown thermal conductivity coefficient. Measurements of temperature, in selected point of the region, are the input data for investigated inverse problem. Basing on this information, a functional describing the error of approximate solution is created. Minimizing of this functional is necessary to solve the inverse problem. In the presented approach the Ant Colony Optimization (ACO) algorithm is used for minimization.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 38-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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