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Research Papers

Thermal Behavior of a Building Provided With Phase-Change Materials on the Roof and Exposed to Solar Radiation

[+] Author and Article Information
Amina Mourid

Laboratory of Physical Materials,
Microelectronics, Automatics and
Heat Transfer (LPMMAT),
Faculté des Sciences Aïn Chock,
Université Hassan II de Casablanca,
Casablanca 20100, Morocco
e-mail: mouridamina@gmail.com

Mustapha El Alami

Laboratory of Physical Materials,
Microelectronics, Automatics and
Heat Transfer (LPMMAT),
Faculté des Sciences Aïn Chock,
Université Hassan II de Casablanca,
Casablanca 20100, Morocco
e-mails: m.elalami@fsac.ac.ma;
elalamimus@gmail.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received May 18, 2017; final manuscript received August 27, 2017; published online September 28, 2017. Assoc. Editor: Ming Qu.

J. Sol. Energy Eng 139(6), 061012 (Sep 28, 2017) (10 pages) Paper No: SOL-17-1189; doi: 10.1115/1.4037905 History: Received May 18, 2017; Revised August 27, 2017

This paper evaluates the effectiveness of phase change materials (PCMs) for the improvement of summer thermal comfort in lightweight buildings. Experiments have been carried out using PCM in the form of DuPont Energain wallboards in combination with a roof. Two factors influencing the effectiveness of PCM (thickness and location of PCM layer) have been investigated. An experimental study was carried out using two identical test cavities submitted to Casablanca weather. Thermal performance such as the roof surface temperatures and heat flux densities, through the envelope, have been studied. The results indicated that, compared with reference room (without PCM), the thermal storage allows solar radiation to be stored and released up to 6–7 h after solar irradiation; this has effects on both the reduction of daily temperature swings (up to 2 °C) and heat flux (more than 88%). It has been proved that the PCM with a thickness of 10.52 mm on the outer face of the roof has good thermal insulation effect and energy efficiency potential.

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Figures

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Fig. 1

View of the experimental cells ((a) PCM cavity and (b) reference cavity)

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Fig. 2

Cavity envelope composition, without PCM

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Fig. 3

Top view of the cell with PCM on the ceiling

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Fig. 5

Studied configurations

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Fig. 6

Global solar radiations of the studied periods

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Fig. 7

Outdoor temperatures of the studied periods

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Fig. 8

Wind speed of the studied periods

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Fig. 9

Temperatures of the inner faces of the ceilings, cases 1–3

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Fig. 10

Ambient temperatures of the cavities, cases 1–3

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Fig. 11

Temperatures of the inner faces of the southern walls of the cavities with and without PCM, cases 1–3

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Fig. 12

Temperatures of the inner faces of the ceilings, cases 2 and 4

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Fig. 13

Ambient temperatures of the cavities, cases 2 and 4

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Fig. 14

Temperatures of the inner faces of the southern walls, cases 2 and 4

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Fig. 15

Emplacement of the thermocouples in the ceiling

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Fig. 16

Transmitted heat flux densities through de ceiling, cases 1–3

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Fig. 17

Stored heat flux densities through de ceiling, cases 1–3

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Fig. 18

Transmitted heat flux densities through de ceiling, cases 2 and 4

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Fig. 19

Stored heat flux densities in PCM layer, cases 2 and 4

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