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

Abdrahman Alsabry, Beata Backiel-Brzozowska, Vadzim I. Nikitsin and Serafim K. Nikitsin
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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

Sustainability, 2022, vol. 14, issue 10, 1-14

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.

Keywords: effective thermal conductivity; capillary-porous materials; moisture content; structure modelling; theory of generalized conductivity; sustainable design of building partitions (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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