Hamdaoui, S. and Mahdaoui, M. and Kousksou, T. and El Afou, Y. and Ait Msaad, A. and Arid, A. and Ahachad, A. (2019) Thermal behaviour of wallboard incorporating a binary mixture as a phase change material. Journal of Building Engineering, 25.

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In this study, a physical model is developed to examine the thermal behavior of a mortar wallboard enclosing a phase change material (PCM). A binary mixture of paraffin (hexadecane-octadecane) is selected as a PCM. The porous medium approach is adopted to investigate the conduction heat transfer through the wallboard. The enthalpy porosity formulation is employed to describe the phase transition inside the PCM. The physical model was successfully verified by comparing its numerical results with the data from the literature. Numerical simulations were performed to determine the thermal response of the wallboard under periodical outside temperature. The effect of the PCM mass, the initial concentration of the binary mixture, the inside and outside heat transfer coefficients and the outside temperature amplitude on the thermal behavior is explored in detail. The time lag (φ) and thermal decrement factor (f) as indicators of the thermal inertia of the wallboard are also discussed and presented. The obtained results show that the use of a pure PCM increases the time delay of the thermal response, while binary mixtures allow reducing the amplitude. In other hand, the thermal behavior of the PCM-Mortar wallboard is optimized as well as the outside convective heat transfer coefficient is lower and the inside convective coefficient is higher. © 2019 Elsevier Ltd

Item Type: Article
Uncontrolled Keywords: Buildings; Digital storage; Energy conservation; Energy storage; Heat conduction; Heat convection; Heat transfer coefficients; Mortar; Paraffins; Phase change materials; Porous materials; Walls (structural partitions), Comfort; Convective coefficient; Enthalpy-porosity; Initial concentration; Outside convective heat transfer coefficients; Porous medium approach; Temperature amplitude; Thermal behaviours, Binary mixtures
Subjects: Engineering
Divisions: SCIENTIFIC PRODUCTION > Engineering
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47
URI: http://eprints.umi.ac.ma/id/eprint/3113

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