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Performance analysis of a planted roof as a passive cooling technique in hot-humid tropics

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  • Hodo-Abalo, Samah
  • Banna, Magolmèèna
  • Zeghmati, Belkacem

Abstract

Planted roofs are passive cooling techniques that reduce the thermal load of buildings. In this paper, the authors have developed a model for evaluating the cooling potential of green roofs. Transfer equations are solved using a finite difference scheme and Thomas algorithm. The study was conducted taking into account the Togolese climate conditions. The effect of Leaf Area Index (LAI) and Biot (Bi) number on diurnal variation of the Solar Heat gain Factor (SHF) is presented and analysed. A correlation for the estimation of the Solar Heat gain Factor as a function of LAI and Bi has been established. The results presented in terms of evapotranspiration (ET) and Solar Heat gains Factor (SHF) show notably that the foliage density and hence the vegetable canopy type selection influence the thermal efficiency of the bioclimatic insulation screen greatly. It was found that a larger LAI reduces the solar flux penetration, stabilizes the fluctuating values, and reduces the indoor air temperature.

Suggested Citation

  • Hodo-Abalo, Samah & Banna, Magolmèèna & Zeghmati, Belkacem, 2012. "Performance analysis of a planted roof as a passive cooling technique in hot-humid tropics," Renewable Energy, Elsevier, vol. 39(1), pages 140-148.
    • Handle: RePEc:eee:renene:v:39:y:2012:i:1:p:140-148
    DOI: 10.1016/j.renene.2011.07.029
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    References listed on IDEAS

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    1. Doug, Banting & Hitesh, Doshi & James, Li & Paul, Missios, 2005. "Report on the Environmental Benefits and Costs of Green Roof Technology for the City of Toronto," MPRA Paper 70526, University Library of Munich, Germany.
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    1. He, Yang & Yu, Hang & Ozaki, Akihito & Dong, Nannan & Zheng, Shiling, 2017. "Influence of plant and soil layer on energy balance and thermal performance of green roof system," Energy, Elsevier, vol. 141(C), pages 1285-1299.
    2. 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.
    3. Chan, A.L.S. & Chow, T.T., 2013. "Evaluation of Overall Thermal Transfer Value (OTTV) for commercial buildings constructed with green roof," Applied Energy, Elsevier, vol. 107(C), pages 10-24.
    4. Saadatian, Omidreza & Sopian, K. & Salleh, E. & Lim, C.H. & Riffat, Safa & Saadatian, Elham & Toudeshki, Arash & Sulaiman, M.Y., 2013. "A review of energy aspects of green roofs," Renewable and Sustainable Energy Reviews, Elsevier, vol. 23(C), pages 155-168.
    5. 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.

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