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Equations for Calculating the Thermal Conductivity of Capillary-Porous Materials with over Sorption Moisture Content

Author

Listed:
  • Abdrahman Alsabry

    (Faculty of Civil Engineering, Architecture and Environmental Engineering, Institute of Civil Engineering, University of Zielona Gora, 65-417 Zielona Gora, 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 Mechanical Engineering, Brest State Technical University, 224017 Brest, Belarus)

  • Serafim K. Nikitsin

    (Faculty of Electronic Information Systems, Brest State Technical University, 224017 Brest, Belarus)

Abstract

This article is the result of the authors’ work on the method of calculating the effective thermal conductivity of moist capillary-porous materials used in wall partitions. The proposed methodology was developed based on the theory of generalized conductivity and geometric modeling of the structure. Materials are considered as heterogeneous ternary systems consisting of a solid skeleton, gas and liquid, and all components are simultaneously taken into account in the calculation. In this work, additional equations are constructed that allow calculation of the effective thermal conductivity of capillary-porous materials with over sorption moisture, thus extending the scope of application of the method to the entire possible range of changes in moisture content. The details of calculating the thermal conductivity of moist capillary-porous materials are demonstrated using experimental data for wall ceramics samples. It is shown that the proposed equations are capable of predicting the thermal conductivity of moist capillary-porous materials with sufficient accuracy. Knowledge of the thermal conductivity of materials in conditions of their actual moisture is fundamental in the sustainable design of new buildings as well as thermo-renovation and dump protection of historic ones.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:10:p:5796-:d:812873
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    References listed on IDEAS

    as
    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.
    2. 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.
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    Cited by:

    1. 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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