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Analytical solution for the study of time lag and decrement factor for building walls in climate of Iran

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  • Fathipour, Reza
  • Hadidi, Amin

Abstract

More than 40% of energy consumption in Iran associated with the building sector. Among the factors affecting energy consumption, time lag and decrement factor of the walls can be mentioned, which usually are not considered in the design of building of Iran. Therefore, in the present study, time lags and decrement factor for different building materials that prevalently are utilized in Iran have been investigated. In this research, the transient heat conduction equation is solved analytically using Green function under time-dependent convection boundary conditions. The effect of different parameters such as wall thickness and both inner and outer heat transfer coefficients as well as the effect of the thermal insulation layer in sandwich wall on time lag and decrement factor is investigated. The results indicate that the thickness and the type of the building material have a significant effect on the time lag and decrement factor of the wall. Also, it is shown that inside combined convection and radiation heat transfer coefficients affects time lag and decrement factor of the walls. The results of the present study are applicable for designing more effective passive solar buildings in Iran and optimal design of walls and other related areas resulting in energy saving.

Suggested Citation

  • Fathipour, Reza & Hadidi, Amin, 2017. "Analytical solution for the study of time lag and decrement factor for building walls in climate of Iran," Energy, Elsevier, vol. 134(C), pages 167-180.
    • Handle: RePEc:eee:energy:v:134:y:2017:i:c:p:167-180
    DOI: 10.1016/j.energy.2017.06.009
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    References listed on IDEAS

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    1. Kaska, Önder & Yumrutas, Recep & Arpa, Orhan, 2009. "Theoretical and experimental investigation of total equivalent temperature difference (TETD) values for building walls and flat roofs in Turkey," Applied Energy, Elsevier, vol. 86(5), pages 737-747, May.
    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. 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.
    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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