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A Systematic Analysis of Phase Change Material and Optically Advanced Roof Coatings Integration for Athenian Climatic Conditions

Author

Listed:
  • Angeliki Kitsopoulou

    (Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 15772 Athens, Greece)

  • Evangelos Bellos

    (Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 15772 Athens, Greece)

  • Panagiotis Lykas

    (Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 15772 Athens, Greece)

  • Christos Sammoutos

    (Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 15772 Athens, Greece)

  • Michail Gr. Vrachopoulos

    (Department of Agricultural Development, Agrofood and Management of Natural Resources, National and Kapodistrian University of Athens, 34400 Psachna, Greece)

  • Christos Tzivanidis

    (Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 15772 Athens, Greece)

Abstract

Energy retrofit solutions that concern a building’s roof structure play a significant role in the enhancement of a building’s thermal behaviour. This study investigates the integration of phase change materials (PCMs) with cool coatings (CCs) or thermochromic coatings (TCCs), namely, a PCM roof, a PCM-CC roof, and a PCM-TCC roof, as alternative and novel tactics for the simultaneous control of solar heat transfer and solar heat reflection. An energy simulation analysis with the DesignBuilder tool is conducted for a one-story residence and the climatic conditions of Athens. The simulation results indicate that, compared to the existing concrete roof construction, the PCM roof, PCM-CC, and PCM-TCC roof systems demonstrate energy savings that reach up to 13.55%, 16.04%, and 21.70%, respectively. The systematic analysis reveals that the increase in PCM’s thickness leads to an increase in the total electricity savings of the buildings, but in the case of PCM-CC and PCM-TCC roof systems, they merely effect the cooling thermal loads. The mean phase transition temperature that favours the cumulative electricity savings is 28 °C in the case of PCM and PCM-TCC roof systems and 35 °C in the case of PCM-CC roof systems. The methodology of this study allows the design of efficient, integrated roof systems with advanced thermal and optical properties as energy retrofit solutions for Mediterranean climatic conditions.

Suggested Citation

  • Angeliki Kitsopoulou & Evangelos Bellos & Panagiotis Lykas & Christos Sammoutos & Michail Gr. Vrachopoulos & Christos Tzivanidis, 2023. "A Systematic Analysis of Phase Change Material and Optically Advanced Roof Coatings Integration for Athenian Climatic Conditions," Energies, MDPI, vol. 16(22), pages 1-20, November.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:22:p:7521-:d:1277995
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    References listed on IDEAS

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    1. Pajek, Luka & Košir, Mitja, 2021. "Strategy for achieving long-term energy efficiency of European single-family buildings through passive climate adaptation," Applied Energy, Elsevier, vol. 297(C).
    2. Wang, Cheng & Zhu, Ye & Guo, Xiaofeng, 2019. "Thermally responsive coating on building heating and cooling energy efficiency and indoor comfort improvement," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    3. Santamouris, M. & Yun, Geun Young, 2020. "Recent development and research priorities on cool and super cool materials to mitigate urban heat island," Renewable Energy, Elsevier, vol. 161(C), pages 792-807.
    4. Lei, Jiawei & Kumarasamy, Karthikeyan & Zingre, Kishor T. & Yang, Jinglei & Wan, Man Pun & Yang, En-Hua, 2017. "Cool colored coating and phase change materials as complementary cooling strategies for building cooling load reduction in tropics," Applied Energy, Elsevier, vol. 190(C), pages 57-63.
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