Thermal storage plays a major role in a wide variety of industrial, commercial, and residential applications when there is a mismatch between the offer and the claim of energy. In this paper, we study numerically the contribution of phase change materials (PCMs) for solar thermal energy storage (TES) in buildings. The studied configuration is a plane solar collector incorporating a PCM layer and coupled to a concrete slab (a roof of a building). The study is conducted for Casablanca (Morocco) meteorological conditions. Several simulations were performed to optimize the melting temperature and the PCM layer thickness. The results show that PCM imposes, on the roof, a temperature close to its melting temperature. The choice of a melting temperature Tmelt = 22 °C (the local indoor temperature Tc is fixed as Tc = 22 °C) limits the losses through the concrete slab, considerably. This last seems to be, nearly, adiabatic, in this case. Also, the energy released by PCM solidification, overnight, increases the outlet temperature of the coolant fluid to 35 °C and the useful flux to 80 W/m2, increasing the efficiency of the solar collector by night. The PCM functioned both as an energy storage material for the stabilization of the coolant fluid temperature and as an insulating material for the building.
Phase Change Material For Solar Thermal Energy Storage In Buildings: Numerical Study
Microelectronics, Automatics and
Heat Transfer (LPMMAT),
Faculty of Sciences,
Hassan II University of Casablanca-Morocco,
Casablanca 20600, Morocco
Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received April 26, 2016; final manuscript received August 9, 2016; published online September 15, 2016. Assoc. Editor: Jorge E. Gonzalez.
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Bouhssine, Z., Najam, M., and El Alami, M. (September 15, 2016). "Phase Change Material For Solar Thermal Energy Storage In Buildings: Numerical Study." ASME. J. Sol. Energy Eng. December 2016; 138(6): 061006. https://doi.org/10.1115/1.4034518
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