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Modeling of cool roof heat transfer in tropical climate

Author

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  • Zingre, Kishor T.
  • Wan, Man Pun
  • Tong, Shanshan
  • Li, Hua
  • Chang, Victor W.-C.
  • Wong, Swee Khian
  • Thian Toh, Winston Boo
  • Leng Lee, Irene Yen

Abstract

Cool roof is gaining popularity as a passive building energy saving solution. A concise and easy-to-apply mathematical model is essential for building designers to evaluate the impact of cool coating on heat transfer and indoor thermal comfort. A novel cool roof heat transfer (CRHT) model was developed using the spectral approximation method. The CRHT model was verified against the conduction transfer function method and was validated against experiments performed in two identically configured apartments with concrete roofs in Singapore. The model predictions show that on a sunny day, a cool coating (solar reflectance of 0.74) reduces the peak roof temperature, indoor air temperature and daily heat gain by up to 14.1 °C, 2.4 °C and 0.66 kWh/m2 (or 54%), respectively through the concrete roof. The model predictions match with experimental measurements with reasonable accuracy. Further model predictions suggested that significant daily heat gain reduction can also be achieved by cool coating on galvanized steel (metal) roofs. The daily heat gain reduction brought by the cool coating drops as the roof exposes to higher wind speeds. The proposed CRHT model largely simplifies the calculation of heat transfer of cool roofs, compared to existing methods, and is generally applicable to opaque solid surfaces (roofs and walls).

Suggested Citation

  • Zingre, Kishor T. & Wan, Man Pun & Tong, Shanshan & Li, Hua & Chang, Victor W.-C. & Wong, Swee Khian & Thian Toh, Winston Boo & Leng Lee, Irene Yen, 2015. "Modeling of cool roof heat transfer in tropical climate," Renewable Energy, Elsevier, vol. 75(C), pages 210-223.
  • Handle: RePEc:eee:renene:v:75:y:2015:i:c:p:210-223
    DOI: 10.1016/j.renene.2014.09.045
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    References listed on IDEAS

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    1. Zingre, Kishor T. & Wan, Man Pun & Yang, Xingguo, 2015. "A new RTTV (roof thermal transfer value) calculation method for cool roofs," Energy, Elsevier, vol. 81(C), pages 222-232.
    2. 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).
    3. 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.
    4. Yeong Huei Lee & Mugahed Amran & Yee Yong Lee & Ahmad Beng Hong Kueh & Siaw Fui Kiew & Roman Fediuk & Nikolai Vatin & Yuriy Vasilev, 2021. "Thermal Behavior and Energy Efficiency of Modified Concretes in the Tropical Climate: A Systemic Review," Sustainability, MDPI, vol. 13(21), pages 1-24, October.
    5. Guo, Rui & Gao, Yafeng & Zhuang, Chaoqun & Heiselberg, Per & Levinson, Ronnen & Zhao, Xia & Shi, Dachuan, 2020. "Optimization of cool roof and night ventilation in office buildings: A case study in Xiamen, China," Renewable Energy, Elsevier, vol. 147(P1), pages 2279-2294.
    6. Bu, Fan & Yan, Da & Tan, Gang & Sun, Hongsan & An, Jingjing, 2022. "Systematically incorporating spectrum-selective radiative cooling into building performance simulation: Numerical integration method and experimental validation," Applied Energy, Elsevier, vol. 312(C).
    7. 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.
    8. Taler, Dawid & Dzierwa, Piotr & Trojan, Marcin & Sacharczuk, Jacek & Kaczmarski, Karol & Taler, Jan, 2019. "Mathematical modeling of heat storage unit for air heating of the building," Renewable Energy, Elsevier, vol. 141(C), pages 988-1004.
    9. Bani, Rawand khasraw & Jalal, Shazad Jamal, 2019. "Impact of shadow distribution on optimizing insolation exposure of roofs according to harness or transfer of solar energy in Sulaimani city, Iraq," Renewable Energy, Elsevier, vol. 136(C), pages 452-462.
    10. Cavadini, Giovan Battista & Cook, Lauren M., 2021. "Green and cool roof choices integrated into rooftop solar energy modelling," Applied Energy, Elsevier, vol. 296(C).
    11. Mirrahimi, Seyedehzahra & Mohamed, Mohd Farid & Haw, Lim Chin & Ibrahim, Nik Lukman Nik & Yusoff, Wardah Fatimah Mohammad & Aflaki, Ardalan, 2016. "The effect of building envelope on the thermal comfort and energy saving for high-rise buildings in hot–humid climate," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 1508-1519.
    12. Bu, Fan & Yan, Da & Tan, Gang & Sun, Hongsan & An, Jingjing, 2023. "Acceleration algorithms for long-wavelength radiation integral in the annual simulation of radiative cooling in buildings," Renewable Energy, Elsevier, vol. 202(C), pages 255-269.
    13. Lu, Xing & Xu, Peng & Wang, Huilong & Yang, Tao & Hou, Jin, 2016. "Cooling potential and applications prospects of passive radiative cooling in buildings: The current state-of-the-art," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 1079-1097.
    14. Kishor T. Zingre & Kiran Kumar D. E. V. S. & Man Pun Wan, 2020. "Analysing the Effect of Substrate Properties on Building Envelope Thermal Performance in Various Climates," Energies, MDPI, vol. 13(19), pages 1-8, October.
    15. Jaehong Park & Sugie Lee, 2022. "Effects of a Cool Roof System on the Mitigation of Building Temperature: Empirical Evidence from a Field Experiment," Sustainability, MDPI, vol. 14(8), pages 1-19, April.

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