Theoretical Analysis Based on Experimental Studies of Heat and Moisture Fluxes Penetrating Through a Masonry Wall Above Ground Level in an Annual Cycle

Mariusz Owczarek () and Barbara Nasiłowska
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Mariusz Owczarek: Faculty of Civil Engineering and Geodesy, Military University of Technology, gen. Sylwestra Kaliskiego Street 2, 00-908 Warsaw, Poland
Barbara Nasiłowska: Institute of Optoelectronics, Military University of Technology, gen. S. Kaliskiego 2, 00-908 Warsaw, Poland

Energies, 2024, vol. 17, issue 22, 1-21

Abstract: This article calculates horizontal and vertical heat and moisture fluxes in the wall based on measurements of temperature and relative humidity in the building wall. It was a basement wall that was close to the ground on one side and the basement ceiling on the other, which increased the difficulty in problem simulation. The brick material from the wall was also analyzed under an electron microscope and its elemental composition was determined using the EDX (Energy Dispersive X-ray spectroscopy) method. The brick had a relatively uniform elemental composition apart from several variations in calcium content. Monthly, daily, and hourly heat and moisture fluxes were determined. The tested wall was characterized by low humidity, and the values obtained of the moisture fluxes confirmed this. The maximum recorded relative humidity inside the wall is 57.89%, and the minimum is 43.99%. The effect of buffering moisture by brick material was noticed. Vertical streams of water vapor were found to be important in the moisture balance of the tested partition. The maximum heat flux through the tested wall area in August was 0.06 W, and the minimum in January was −0.2 W. The maximum moisture flux in August was 5 × 10 −11 kg/s, and the minimum in January was −5 × 10 −11 kg/s.

Keywords: moisture content; masonry wall; heat fluxes; porous material vapor conductivity; temperature and humidity measurements (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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