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Analysis of Non-Equilibrium and Equilibrium Models of Heat and Moisture Transfer in a Wet Porous Building Material

Author

Listed:
  • Mirosław Seredyński

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Michał Wasik

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Piotr Łapka

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Piotr Furmański

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Łukasz Cieślikiewicz

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Karol Pietrak

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Michał Kubiś

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Tomasz S. Wiśniewski

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

  • Maciej Jaworski

    (Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, 00-665 Warsaw, Poland)

Abstract

In the proposed paper, non-equilibrium and equilibrium models of heat and moisture transfer through wet building materials are presented and compared. In the former, the mass transfer between liquid and gaseous moisture results from the difference between the partial pressure of water vapor and its saturation value. In the second model, the equilibrium between both phases is assumed. In the non-equilibrium model, liquid moisture can be in the continuous (funicular) or discontinuous (pendular) form. The transfer of moisture for each proposed model is tightly coupled with the energy transfer, which is assumed to be an equilibrium process. The time step and grid size sensitivity analysis of both numerical models are performed primarily. The verification of the model is based also on the numerical data available in literature. Finally, obtained with considered models, temporal variations of moisture content in three locations in the computational domain are compared. Reasonable conformity of results is reported, and discrepancies related to differences in formulations of models are discussed.

Suggested Citation

  • Mirosław Seredyński & Michał Wasik & Piotr Łapka & Piotr Furmański & Łukasz Cieślikiewicz & Karol Pietrak & Michał Kubiś & Tomasz S. Wiśniewski & Maciej Jaworski, 2020. "Analysis of Non-Equilibrium and Equilibrium Models of Heat and Moisture Transfer in a Wet Porous Building Material," Energies, MDPI, vol. 13(1), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:1:p:214-:d:304398
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    Citations

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    Cited by:

    1. Łukasz Cieślikiewicz & Piotr Łapka & Radosław Mirowski, 2020. "In Situ Monitoring of Drying Process of Masonry Walls," Energies, MDPI, vol. 13(23), pages 1-13, November.
    2. Piotr Łapka & Łukasz Cieślikiewicz, 2021. "Efficiency Comparison between Two Masonry Wall Drying Devices Using In Situ Data Measurements," Energies, MDPI, vol. 14(21), pages 1-14, November.
    3. Wasik, Michał & Łapka, Piotr, 2022. "Analysis of seasonal energy consumption during drying of highly saturated moist masonry walls in polish climatic conditions," Energy, Elsevier, vol. 240(C).
    4. Wasik, Michał & Łapka, Piotr, 2023. "Numerical analysis on the energy efficiency improvement of thermo-injection method of masonry walls drying by applying the variable temperature profiles of drying air," Energy, Elsevier, vol. 282(C).

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