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Thermal Fluxes and Solar Energy Storage in a Massive Brick Wall in Natural Conditions

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  • Mariusz Owczarek

    (Faculty of Civil Engineering and Geodesy, Military University of Technology, gen. Sylwestra Kaliskiego 2, 00-908 Warszawa, Poland)

Abstract

The thermal state of building elements is a combination of steady and transient states. Changes in temperature and energy streams in the wall of the building in the transient state are particularly intense in its outer layer. The factors causing them are solar radiation, ambient temperature and long-wave radiation. Due to the greater variability of these factors during the summer, the importance of the transient state increases at this time. The study analysed heat transfer in three aspects, temperatures in the outer, middle and inner parts of the wall, heat fluxes between these layers and absorption of solar energy, heat transfer coefficient on the wall exterior was also calculated. The analysis is based on temperature measurements at several depths in the wall and measurements of solar radiation. The subject of research is a solid brick wall. The results show that the characteristics of heat flow in winter and summer for the local climate show distinct differences. In the winter, the maximum temperature difference between the external and internal surface of the wall was 10 °C and in summer, 20 °C. In the winter, the negative flux on the internal surface reached 10 W/m 2 and on the external 40 W/m 2 and was constant throughout the day. The mean heat transfer coefficient on the exterior surface for winter week was 8 W/(mK). A Nusselt and Biot number for dimensionless convection analysis was calculated. The research contributes to the calculation of the variability of heat or cold demand in a daily period and to learn about the processes of energy storage in the wall using sensible heat.

Suggested Citation

  • Mariusz Owczarek, 2021. "Thermal Fluxes and Solar Energy Storage in a Massive Brick Wall in Natural Conditions," Energies, MDPI, vol. 14(23), pages 1-17, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:23:p:8093-:d:694273
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    References listed on IDEAS

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    1. Antonopoulos, K.A. & Vrachopoulos, M., 1995. "On the inverse transient heat-transfer problem in structural elements exposed to solar radiation," Renewable Energy, Elsevier, vol. 6(4), pages 381-397.
    2. Mariusz Owczarek & Stefan Owczarek & Adam Baryłka & Andrzej Grzebielec, 2021. "Measurement Method of Thermal Diffusivity of the Building Wall for Summer and Winter Seasons in Poland," Energies, MDPI, vol. 14(13), pages 1-11, June.
    3. Kočí, J. & Fořt, J. & Černý, R., 2020. "Energy efficiency of latent heat storage systems in residential buildings: Coupled effects of wall assembly and climatic conditions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 132(C).
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