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A Model of Moist Polymer Foam and a Scheme for the Calculation of Its Thermal Conductivity

Author

Listed:
  • Vadzim I. Nikitsin

    (Faculty of Technical Sciences, Pope John Paul II State School of Higher Education in Biala Podlaska, 21-500 Biała Podlaska, Poland)

  • Abdrahman Alsabry

    (Faculty of Civil Engineering, Architecture and Environmental Engineering, Institute of Civil Engineering, University of Zielona Gora, 65-417 Zielona Góra, Poland)

  • Valery A. Kofanov

    (Department of Computer Science and Applied Mathematics, Brest State Technical University, 224017 Brest, Belarus)

  • Beata Backiel-Brzozowska

    (Faculty of Civil Engineering and Environmental Sciences, Institute of Civil Engineering and Transport, Bialystok University of Technology, 15-351 Białystok, Poland)

  • Paweł Truszkiewicz

    (Department of Foreign Languages, University of Zielona Gora, 65-417 Zielona Góra, Poland)

Abstract

This paper proposes a method for determining an effective value of the thermal conductivity for moist, highly porous rigid polymer foams. The model of moist foam based on an ordered structure with interpenetrating components was developed in accordance with the moisture distribution in the pore space. With small moisture content, isolated water inclusions are formed, and the pore space is considered as a binary system (vapor-gas mixture and water) with isolated inclusions. With an increase in moisture content, isolated water inclusions merge, forming a continuous layer, and pore space is considered as a binary system of interpenetrating components. The thermal conductivity of the vapor-gas mixture is represented as the sum of the thermal conductivity of the dry gas and the thermal conductivity of the vapor caused by the diffusion transfer of vapor in the pore space, taking into account the coefficient of vapor diffusion resistance. Using the proposed scheme of calculation, a computational experiment was performed to establish the influence of the vapor diffusion, moisture content, and average temperature of the foam on its thermal conductivity.

Suggested Citation

  • Vadzim I. Nikitsin & Abdrahman Alsabry & Valery A. Kofanov & Beata Backiel-Brzozowska & Paweł Truszkiewicz, 2020. "A Model of Moist Polymer Foam and a Scheme for the Calculation of Its Thermal Conductivity," Energies, MDPI, vol. 13(3), pages 1-11, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:520-:d:311334
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    Citations

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    Cited by:

    1. Abdrahman Alsabry & Beata Backiel-Brzozowska & Vadzim I. Nikitsin & Serafim K. Nikitsin, 2022. "Equations for Calculating the Thermal Conductivity of Capillary-Porous Materials with over Sorption Moisture Content," Sustainability, MDPI, vol. 14(10), pages 1-14, May.
    2. Grzegorz Dombek & Zbigniew Nadolny & Piotr Przybylek & Radoslaw Lopatkiewicz & Agnieszka Marcinkowska & Lukasz Druzynski & Tomasz Boczar & Andrzej Tomczewski, 2020. "Effect of Moisture on the Thermal Conductivity of Cellulose and Aramid Paper Impregnated with Various Dielectric Liquids," Energies, MDPI, vol. 13(17), pages 1-17, August.
    3. Abdrahman Alsabry & Beata Backiel-Brzozowska & Vadzim I. Nikitsin, 2020. "Dependencies for Determining the Thermal Conductivity of Moist Capillary-Porous Materials," Energies, MDPI, vol. 13(12), pages 1-14, June.
    4. Jan Kočí & Robert Černý, 2020. "Special Issue “Recent Developments in Building Physics”," Energies, MDPI, vol. 13(23), pages 1-3, December.

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