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Modelling of cool roof performance for double-skin roofs in tropical climate

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  • Zingre, Kishor T.
  • Wan, Man Pun
  • Wong, Swee Khian
  • Toh, Winston Boo Thian
  • Lee, Irene Yen Leng

Abstract

Double-skin roof is a popular passive cooling solution to curb heat gain into buildings and cool roof is another emerging solution. This study proposed a novel CRHT (cool roof heat transfer) model for double-skin roof which is able to model the heat transfers for a double-skin roof combined with cool roof. The CRHT model was validated against experiments performed in two identically-configured, naturally ventilated apartments in Singapore. CRHT predictions match with experimental measurements with reasonable accuracy. White-color cool coating on a flat double-skin roof reduces the daily heat gain by 0.21 kWh/m2 (or 51%), resulting peak indoor air temperature reduction by 2.4 °C on a sunny day. Furthermore, thermal performance of cool roof is compared with double-skin roof using the CRHT model. In the roof setup of the current study, double-skin roof is about 6% more effective than cool roof in reducing annual heat gain into the apartment during day time. However, the extra insulation of double-skin roof hinders the heat loss during night time, ensuing cool roof is almost equally effective in reducing net annual heat gain. The proposed CRHT model is generally applicable to any climate conditions as demonstrated by applying it for Mediterranean climate of Athens, Greece.

Suggested Citation

  • Zingre, Kishor T. & Wan, Man Pun & Wong, Swee Khian & Toh, Winston Boo Thian & Lee, Irene Yen Leng, 2015. "Modelling of cool roof performance for double-skin roofs in tropical climate," Energy, Elsevier, vol. 82(C), pages 813-826.
    • Handle: RePEc:eee:energy:v:82:y:2015:i:c:p:813-826
    DOI: 10.1016/j.energy.2015.01.092
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    9. Wang, Haitao & Wei, Jiahua & Guo, Chengzhou & Yang, Liu & Wang, Zuyuan, 2024. "Numerical investigation of the effects of different influencing factors on thermal performance of naturally ventilated roof," Energy, Elsevier, vol. 289(C).
    10. Qin, Yinghong & Zhang, Mingyi & Hiller, Jacob E., 2017. "Theoretical and experimental studies on the daily accumulative heat gain from cool roofs," Energy, Elsevier, vol. 129(C), pages 138-147.
    11. Ascione, Fabrizio & De Masi, Rosa Francesca & Santamouris, Mattheos & Ruggiero, Silvia & Vanoli, Giuseppe Peter, 2018. "Experimental and numerical evaluations on the energy penalty of reflective roofs during the heating season for Mediterranean climate," Energy, Elsevier, vol. 144(C), pages 178-199.
    12. Syed Ahmad Farhan & Fouad Ismail Ismail & Osamah Kiwan & Nasir Shafiq & Azni Zain-Ahmed & Nadzhratul Husna & Afif Izwan Abd Hamid, 2021. "Effect of Roof Tile Colour on Heat Conduction Transfer, Roof-Top Surface Temperature and Cooling Load in Modern Residential Buildings under the Tropical Climate of Malaysia," Sustainability, MDPI, vol. 13(9), pages 1-23, April.
    13. Lima-Téllez, T. & Chávez, Y. & Hernández-López, I. & Xamán, J. & Hernández-Pérez, I., 2022. "Annual thermal evaluation of a ventilated roof under warm weather conditions of Mexico," Energy, Elsevier, vol. 246(C).
    14. Seong-Il Park & Taek-Hyoung Ryu & Ick-Chang Choi & Jung-Sup Um, 2019. "Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs," Energies, MDPI, vol. 12(14), pages 1-14, July.
    15. V. Vinod Kumar & Nitin Raut & Norie Allafi Akeel & Omar Suliman Zaroog, 2023. "Experimental investigation of cooling potential of a ventilated cool roof with air gap as a thermal barrier," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(4), pages 3255-3268, April.
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