A new parameter for the dynamic analysis of building walls using the harmonic method

The authors propose a methodology to schematize correctly the capacitive effects in the transmission of heat in the multilayered walls of buildings. An analytical study is presented related to a steady periodic regime allowing consideration of three external loads acting singularly or simultaneously...

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Bibliographic Details
Published in:International journal of thermal sciences 2015-02, Vol.88, p.96-109
Main Authors: Oliveti, G., Arcuri, N., Mazzeo, D., De Simone, M.
Format: Article
Language:English
Subjects:
Brick
Building walls
Buildings
Construction
Decrement factor
Dynamic analysis
Dynamic tests
Dynamics
Harmonic method
Heat flux
Heat transfer
Thermal parameters
Time lag
Walls
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Summary:The authors propose a methodology to schematize correctly the capacitive effects in the transmission of heat in the multilayered walls of buildings. An analytical study is presented related to a steady periodic regime allowing consideration of three external loads acting singularly or simultaneously: air temperature, apparent sky temperature and incident solar irradiation. Such a study is applied in the case of four traditional types of wall (A – brick wall, B – hollow wall, C – polarized brick wall, D – prefabricated wall). The expression of the oscillating heat flux, which penetrates the internal environment, and the conductive heat flux which penetrates the wall in contact with the external air, was obtained by means of the electrical analogy and the resolution of the equivalent circuit. It is demonstrated that the nondimensional periodic global transmittance, the ratio between the heat flux which is transferred to the indoor environment and the external heat flux, with the plant turned on, is the most suitable nondimensional parameter for the dynamic analysis of the walls. This parameter allows for the evaluation of all the typical dynamic quantities for the complete description of the thermal behavior of the walls. •The thermal behavior of building walls by the harmonic method is analyzed.•Three forcings for the thermal dynamic characterization of the walls are considered.•New methodology and parameters for the dynamic analysis of the walls are formulated.•The parameters are applied to compare the thermal performance of different walls.
ISSN:1290-0729
1778-4166
DOI:10.1016/j.ijthermalsci.2014.09.006