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The influence of concrete density and conductivity on walls’ thermal inertia parameters under a variety of masonry and insulation placements

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  • Kontoleon, K.J.
  • Theodosiou, Th.G.
  • Tsikaloudaki, K.G.

Abstract

In this study the variations of concrete density and concrete thermal conductivity of various wall assemblies are considered to analyse their influence on the dynamic thermal characteristics, such as the decrement factor and time lag. The assemblies under study refer to insulated walls with variable concrete density and the concrete placement in one or two layers. The insulation is also placed as one or two equivalent layers giving rise to a total of six typical wall configurations. The thermal inertia parameters are determined using the thermal-circuit modelling approach and the analysis is based on the nodal solution method. Density and conductivity variations of the concrete layers are seen to interrelate non-linearly with the walls’ RC-sections corresponding parameters with consequences on its inertia parameters. As such variations, together with the studied insulation placements, affect the decrement factor and time lag in a different fashion, metrics for assessing the walls’ thermal behaviour from a proportional (PDM, PTM) and a relative (RDM, RTM) point of view are introduced. Computer results, showing the impact of the variations of concrete density and conductivity on the decrement factor, time lag and the proposed metrics are presented for all the studied wall assemblies.

Suggested Citation

  • Kontoleon, K.J. & Theodosiou, Th.G. & Tsikaloudaki, K.G., 2013. "The influence of concrete density and conductivity on walls’ thermal inertia parameters under a variety of masonry and insulation placements," Applied Energy, Elsevier, vol. 112(C), pages 325-337.
    • Handle: RePEc:eee:appene:v:112:y:2013:i:c:p:325-337
    DOI: 10.1016/j.apenergy.2013.06.029
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    References listed on IDEAS

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    1. Al-Sanea, Sami A. & Zedan, M.F. & Al-Hussain, S.N., 2013. "Effect of masonry material and surface absorptivity on critical thermal mass in insulated building walls," Applied Energy, Elsevier, vol. 102(C), pages 1063-1070.
    2. Mavromatidis, Lazaros Elias & EL Mankibi, Mohamed & Michel, Pierre & Santamouris, Mat, 2012. "Numerical estimation of time lags and decrement factors for wall complexes including Multilayer Thermal Insulation, in two different climatic zones," Applied Energy, Elsevier, vol. 92(C), pages 480-491.
    3. Al-Sanea, Sami A. & Zedan, M.F., 2011. "Improving thermal performance of building walls by optimizing insulation layer distribution and thickness for same thermal mass," Applied Energy, Elsevier, vol. 88(9), pages 3113-3124.
    4. Kontoleon, K.J. & Eumorfopoulou, E.A., 2008. "The influence of wall orientation and exterior surface solar absorptivity on time lag and decrement factor in the Greek region," Renewable Energy, Elsevier, vol. 33(7), pages 1652-1664.
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    Cited by:

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    2. Mazzeo, D. & Oliveti, G. & Arcuri, N., 2016. "Influence of internal and external boundary conditions on the decrement factor and time lag heat flux of building walls in steady periodic regime," Applied Energy, Elsevier, vol. 164(C), pages 509-531.
    3. Kyriakidis, Andreas & Michael, Aimilios & Illampas, Rogiros & Charmpis, Dimos C. & Ioannou, Ioannis, 2018. "Thermal performance and embodied energy of standard and retrofitted wall systems encountered in Southern Europe," Energy, Elsevier, vol. 161(C), pages 1016-1027.
    4. Kontoleon, K.J. & Giarma, C., 2016. "Dynamic thermal response of building material layers in aspect of their moisture content," Applied Energy, Elsevier, vol. 170(C), pages 76-91.
    5. Theodosiou, Theodoros & Tsikaloudaki, Katerina & Kontoleon, Karolos & Giarma, Christina, 2021. "Assessing the accuracy of predictive thermal bridge heat flow methodologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 136(C).
    6. Kyriakidis, A. & Michael, A. & Illampas, R. & Charmpis, D.C. & Ioannou, I., 2019. "Comparative evaluation of a novel environmentally responsive modular wall system based on integrated quantitative and qualitative criteria," Energy, Elsevier, vol. 188(C).
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    8. Corrado, Vincenzo & Paduos, Simona, 2016. "New equivalent parameters for thermal characterization of opaque building envelope components under dynamic conditions," Applied Energy, Elsevier, vol. 163(C), pages 313-322.

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