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Research Papers

Location and Thickness Effect of Two Phase Change Materials Between Layers of Roof on Energy Consumption for Air-Conditioned Room

[+] Author and Article Information
Hamid Hamza, Nisrine Hanchi, Bouchra Abouelkhayrat, Jawad Lahjomri, Abdelaziz Oubarra

Laboratory of Mechanics,
Faculty of Sciences Aïn Chock,
Hassan II University,
Casablanca 20100, Morocco

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received September 30, 2014; final manuscript received July 6, 2015; published online December 8, 2015. Assoc. Editor: Ziad Saghir.

J. Thermal Sci. Eng. Appl 8(2), 021009 (Dec 08, 2015) (7 pages) Paper No: TSEA-14-1230; doi: 10.1115/1.4031924 History: Received September 30, 2014; Revised July 06, 2015

Thermal discomfort inside building is due to outside climate, especially by excessive solar radiation during summer or by temperature drop during a cold season. The use of phase change materials (PCMs) can reduce this effect by storing heat transmitted by sensible and latent heat. This ensures good situation of thermal comfort throughout the year. In this work, thermal behavior of two roofing systems is studied. One roof that is taken as reference is constituted by usual materials in building. In the second, two PCMs are inserted according to three configurations. The objective of the study is to assess incorporation effect of two PCMs within reference roof and to evaluate the optimum locations to reduce the energy consumption of air-conditioned room. A monodimensional numerical model, validated analytically and experimentally, is used to carry out a parametric analysis to determine the characteristics of the PCMs to be used and their optimal location within the reference roof regardless of the external climate effect. Numerical calculations are performed for three configurations of roof with swapping PCMs. Results show that insertion of PCMs in the roof provides the best energy consumption saving regardless of annual climate change. Reduction in energy consumption of an air-conditioned room depends on the combination of PCMs, their mutual thicknesses, and thermal comfort level.

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Figures

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Fig. 1

Scheme of reference roof

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Fig. 2

Locations of PCMs inserted in the roof

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Fig. 3

Evolution of solid–liquid interface versus time for Newman problem [22]

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Fig. 4

Temperature profile within PCM during a cycle storage and destorage [6]

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Fig. 5

Combinations of PCMs for comfort temperature Ti = 20 °C

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Fig. 6

Combinations of PCMs for comfort temperature Ti = 18 °C

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Fig. 7

Relative energy deviation according to thicknesses of upper and lower PCMs incorporated in the roof for comfort temperature Ti = 20 °C

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Fig. 8

Relative energy deviation according to thicknesses of upper and lower PCMs incorporated in the roof for comfort temperature Ti = 18 °C

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