Research Papers

Experimental Study of Thermal Performance of a Reduced Scale Cavity Equipped With Phase Change Material: Study of the Optimal Phase Change Material Layer Location

[+] Author and Article Information
Ayoub Gounni

Laboratory of Physical Materials,
Microelectronics, Automatics and
Heat Transfer (LPMMAT),
Faculty of Sciences,
Hassan II University of Casablanca-Morocco,
Casablanca 20000, Morocco
e-mail: gounni.ayoub@gmail.com

Mustapha El Alami

Laboratory of Physical Materials,
Microelectronics, Automatics and
Heat Transfer (LPMMAT),
Faculty of Sciences,
Hassan II University of Casablanca-Morocco,
Casablanca 20000, Morocco
e-mails: m.elalami@fsac.ac.ma;

Mohamed Tahar Mabouk

Université de Lorraine,
UMR CNRS 7563,
Vandoeuvre-lès-Nancy F-54500, France
e-mail: mohamed.mabrouk@gmx.fr

Abdelhamid Kheiri

Université de Lorraine,
UMR CNRS 7563,
Vandoeuvre-lès-Nancy F-54500, France
e-mail: abdelhamid.kheiri@univ-lorraine.fr

1Corresponding author.

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 August 3, 2017; final manuscript received December 29, 2017; published online March 13, 2018. Assoc. Editor: Jorge Gonzalez.

J. Sol. Energy Eng 140(4), 041001 (Mar 13, 2018) (6 pages) Paper No: SOL-17-1321; doi: 10.1115/1.4039331 History: Received August 03, 2017; Revised December 29, 2017

Phase change materials (PCMs) used in the building walls constitute an attractive way to reduce the energy consumption and to increase the occupant's thermal comfort. However, there are some challenges to be faced among which the critical one is the PCM layer location allowing the greater heat flux reduction. In this work, the potential of PCM wallboards is evaluated experimentally using a heated reduced scale cavity including walls with or without PCM in a laboratory conditions. The cavity at reduced scale provides the flexibility to test most kinds of wall constructions in real time and allows faster installation and dismantling of the test walls. Three different PCM layer locations inside the walls are examined in terms of heat flux reduction and outside surface temperatures. The results confirm that the PCM layer reduces the peak heat flux compared to a reference wall (wall without PCM). Indeed, the PCM layer hugely affects the peak heat flux when it is placed on the inner face of the walls, near to the heat source. At this location, the peak heat flux reduction, compared to the reference wall, is 32.9%. Furthermore, for numerical validation purpose, the outside overall heat coefficient of the cavity outside walls is determined based on the experimental data.

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Fig. 1

Phase change material used in this study

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Fig. 2

Cavity placed in a local with controlled temperature

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Fig. 3

Wall compositions: (a) PCM wall and (b) reference wall

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Fig. 4

Flux-meters and thermocouples positions

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Fig. 5

Resulting indoor and outdoor air temperatures

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Fig. 6

Exterior and interior surface temperature of the PCM walls with only wood layers during the calibration test

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Fig. 7

Temperatures of the external faces

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Fig. 8

Temperature evolution at the inner and outer PCM layer of the PCM1 and PCM2 walls

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Fig. 9

Heat fluxes densities across the vertical walls

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Fig. 10

Convective heat transfer coefficient calculated for the vertical walls




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