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Dependencies for Determining the Thermal Conductivity of Moist Capillary-Porous Materials

Author

Listed:
  • Abdrahman Alsabry

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

  • Beata Backiel-Brzozowska

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

  • Vadzim I. Nikitsin

    (Faculty of Civil Engineering, Brest State Technical University, 224017 Brest, Belarus)

Abstract

A method of determining the effective thermal conductivity of moist capillary-porous materials has been proposed, in which calculations are carried out while taking into account all components of the system (solid, liquid and gas) at once. The method makes it easy to take into account the way water is distributed in the pore space of the material, either as isolated inclusions (drops) or as a continuous component, depending on the moisture content of the material. In the analysis of heat transport in moist capillary-porous materials, the theory of generalized conductivity is used and the structure of moist material is modeled using an ordered geometric structure consisting of identical unit cells in the form of a cube. An equation is obtained for calculating the effective conductivity of capillary-porous materials with isolated and continuous liquid inclusions, with adiabatic and isothermal division of the unit cell. The proposed method is compared to the previously proposed method of determining the effective thermal conductivity of moist materials, in which the three-component system is gradually reduced to a binary system, showing disadvantages of this method compared to the currently proposed. It has been shown that the proposed formulas grant the possibility of a sufficiently accurate prediction of experimental results using the experimental results of the thermal conductivity of moist aerated concrete.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3211-:d:374255
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    References listed on IDEAS

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    1. 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.
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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. Beata Backiel-Brzozowska & Vadzim I. Nikitsin & Abdrahman Alsabry & Serafim K. Nikitsin & Wioleta Rutkowska, 2022. "Peculiarities of Calculating the Thermal Conductivity of Moist Autoclaved Aerated Concrete," Energies, MDPI, vol. 15(16), pages 1-11, August.

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