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Boundary Conditions Accuracy Effect on the Numerical Simulations of the Thermal Performance of Building Elements

Author

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  • Paris A. Fokaides

    (School of Engineering, Frederick University, Nicosia 1036, Cyprus
    Faculty of Civil Engineering and Architecture, Kaunas University of Technology, Kaunas 51367, Lithuania)

  • Angeliki Kylili

    (School of Engineering, Frederick University, Nicosia 1036, Cyprus)

  • Ioannis Kyriakides

    (Department of Electrical and Computer Engineering, University of Nicosia, Nicosia 2147, Cyprus)

Abstract

Numerical simulation is widely used in the field of computational building physics for the definition of the thermal performance of building elements. An integral component of numerical simulation using finite elements is the boundary conditions, which, in the case of simulating the thermal performance of a building element, are usually expressed in terms of the external surface temperature as a function of time. The purpose of this study is to examine the effect of the accuracy of the boundary conditions on the thermal performance simulation of building elements. The assumption that the temperature versus time is a sinusoidal function, applied in standard methods, is comparatively assessed with the actual function for diverse climatic conditions using finite elements simulation. The findings of the analysis indicate that the sinusoidal function fails to accurately simulate real boundary conditions. The originality of this study lies within the adoption of a signal reconstruction algorithm, which follows a novel approach by reconstructing the actual temperature versus time signal for the simulation of the actual boundary conditions.

Suggested Citation

  • Paris A. Fokaides & Angeliki Kylili & Ioannis Kyriakides, 2018. "Boundary Conditions Accuracy Effect on the Numerical Simulations of the Thermal Performance of Building Elements," Energies, MDPI, vol. 11(6), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1520-:d:151895
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    References listed on IDEAS

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    1. Fokaides, Paris A. & Christoforou, Elias A. & Kalogirou, Soteris A., 2014. "Legislation driven scenarios based on recent construction advancements towards the achievement of nearly zero energy dwellings in the southern European country of Cyprus," Energy, Elsevier, vol. 66(C), pages 588-597.
    2. 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:

    1. Paris A. Fokaides & Rasa Apanaviciene & Jurgita Černeckiene & Andrius Jurelionis & Egle Klumbyte & Vilma Kriauciunaite-Neklejonoviene & Darius Pupeikis & Donatas Rekus & Jolanta Sadauskiene & Lina Sed, 2020. "Research Challenges and Advancements in the field of Sustainable Energy Technologies in the Built Environment," Sustainability, MDPI, vol. 12(20), pages 1-20, October.
    2. Mergim Gaši & Bojan Milovanović & Marino Grozdek & Marina Bagarić, 2023. "Laplace and State-Space Methods for Calculating the Heat Losses in Case of Heavyweight Building Elements and Short Sampling Times," Energies, MDPI, vol. 16(11), pages 1-18, May.

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