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    Wyświetlanie 1-3 z 3
    Tytuł:
    Investigation of thermal insulation panels made of wood shavings
    Autorzy:
    Pásztory, Zoltán
    Kókai, Péter
    Adamik, Péter
    Halász, Katalin
    Börcsök, Zoltán
    Powiązania:
    https://bibliotekanauki.pl/articles/2010796.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    natural insulation
    wood shavings utilization
    urea formaldehyde
    methyl diphenyl diisocyanate
    Opis:
    Natural insulations made from by-products available in large quantities are growing in importance. In the wood processing industry, among other materials, wood chips and shavings are available in large quantities. The aim of this research was to determine the optimal density of thermal insulation panels made of different wood shavings. Planer and drill shavings of spruce (Picea abies) were used as raw material. The same amount of both types of shavings was compacted. The thermal conductivity of both types of shavings asymptotically approached a value between 0.05 and 0.06 W/mK. After a preliminary experiment, panels were manufactured with densities from 55 to 400 kg/m3 with urea formaldehyde and with methyl diphenyl diisocyanate glue. The thermal conductivity and the bending strength of the panels increased with increasing density. The bending strength of the panels glued with methyl diphenyl diisocyanate was much higher than for the others with the same densities.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2021, 64, 207; 73-86
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The application of a molecular sieve for drying the insulation system of a power transformer in terms of improving its perational reliability
    Autorzy:
    Cybulski, Mateusz
    Przybyłek, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2172034.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    power transformer
    insulation system
    drying
    molecular sieve
    mineral oil
    natural ester
    synthetic ester
    Opis:
    The first research objective was the assessment of the selectivity of water and hydrogen adsorption by the 3A molecular sieve (MS) in the terms of the safety of using the DGA (Dissolved Gas Analysis) method as a diagnostic technique. The second objective was to demonstrate the efficiency of drying the insulation system consisting of cellulose insulation impregnated with various insulating liquids in terms of improving safety and extending the service life of power transformers. In order to achieve the assumed objectives, measurement systems were prepared and material tests were carried out, based mainly on chromatographic analyzes and measurements of water content using the Karl Fischer titration method. On the basis of the obtained test results and the conducted physical analyzes, the selectivity of MS sorption was shown and it was explained that the facilitator of the adsorption of water molecules is their polar nature related to their large dipole moment. The high efficiency of drying cellulose insulation impregnated with various insulating liquids using MS was also demonstrated.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 3; 502--509
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study on the effects of multiple internal diathermal obstructions on natural convection in a fluid-saturated porous enclosure
    Autorzy:
    Chordiya, J. S.
    Sharma, R. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/139520.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal insulation
    natural convection
    internal obstructions
    porous enclosure
    Darcy's law
    izolacja termiczna
    konwekcja naturalna
    przeszkody wewnętrzne
    obudowa porowata
    prawo Darcy'ego
    Opis:
    The present work aims at studying the effects of orientation, size, position, and the combination of multiple internal diathermal obstructions in a fluid-saturated square porous enclosure, generally encountered in thermal insulations. The overall objective is to suppress the natural convection fluid flow and heat transfer across a differentially heated porous enclosure. To serve this purpose, multiple diathermal obstructions are employed to mechanically protrude into a porous medium. It is sought to estimate the effect of various types of orientation, clustering and alternate positioning of obstructions by considering number of obstructions (Np), length of obstructions (λ), modified Rayleigh number (Ra*) on local and average Nusselt number (Nu). The Darcy model for porous media is solved using Finite difference method along with Successive Accelerated Replacement scheme. One of the findings is that the value of the Nusselt number decreases by increasing both, the number of obstructions as well as the length of obstructions irrespective of its orientation and positioning. The reduction in Nusselt number is significant with obstructions attached on lower half of the hot wall and/or on upper half of cold wall. In addition, the overall reduction in Nusselt number is slightly greater with obstructions attached explicitly to the cold wall.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 4; 553-578
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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