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Experimental and numerical investigation of urban street canyons to evaluate the impact of green roof inside and outside buildings

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  • Ouldboukhitine, Salah-Eddine
  • Belarbi, Rafik
  • Sailor, David J.

Abstract

In the present work, an experimental urban canyon (scale 1:10) with 4cm concrete wall thickness and full scale green roof was used to evaluate the impact of green roof inside and outside the buildings. The platform was equally used to validate a coupled heat and mass transfer model for green roof behavior. The albedo of the green roof was measured and implemented in the numerical model. The developed model has been coupled to a building thermal code (TRNSYS). Then, simulations were conducted for the experimental urban canyon studied where a comparison was undertaken between green and conventional roofing. A reduction of the maximum roof surface temperature by 20°C was found in summer due to the green roof. Green roof protects the roof membrane from high temperature fluctuations increasing the roof longevity and delay the timing of the peak membrane surface temperature by several hours. Also, the presence of vegetation permits to reduce the outside air temperature of the street canyon by 0.8°C. Hence, green roofing is an effective solution to reduce the total energy demand and to improve the urban microclimate in the street canyon for an oceanic temperate climate.

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  • Ouldboukhitine, Salah-Eddine & Belarbi, Rafik & Sailor, David J., 2014. "Experimental and numerical investigation of urban street canyons to evaluate the impact of green roof inside and outside buildings," Applied Energy, Elsevier, vol. 114(C), pages 273-282.
    • Handle: RePEc:eee:appene:v:114:y:2014:i:c:p:273-282
    DOI: 10.1016/j.apenergy.2013.09.073
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    5. Mihalakakou, Giouli & Souliotis, Manolis & Papadaki, Maria & Menounou, Penelope & Dimopoulos, Panayotis & Kolokotsa, Dionysia & Paravantis, John A. & Tsangrassoulis, Aris & Panaras, Giorgos & Giannako, 2023. "Green roofs as a nature-based solution for improving urban sustainability: Progress and perspectives," Renewable and Sustainable Energy Reviews, Elsevier, vol. 180(C).
    6. Mohajeri, N. & Gudmundsson, A. & Kunckler, T. & Upadhyay, G. & Assouline, D. & Kämpf, J.H & Scartezzini, J.L., 2019. "A solar-based sustainable urban design: The effects of city-scale street-canyon geometry on solar access in Geneva, Switzerland," Applied Energy, Elsevier, vol. 240(C), pages 173-190.
    7. Brunetti, Giuseppe & Porti, Michele & Piro, Patrizia, 2018. "Multi-level numerical and statistical analysis of the hygrothermal behavior of a non-vegetated green roof in a mediterranean climate," Applied Energy, Elsevier, vol. 221(C), pages 204-219.
    8. Mansoureh Gholami & Alberto Barbaresi & Patrizia Tassinari & Marco Bovo & Daniele Torreggiani, 2020. "A Comparison of Energy and Thermal Performance of Rooftop Greenhouses and Green Roofs in Mediterranean Climate: A Hygrothermal Assessment in WUFI," Energies, MDPI, vol. 13(8), pages 1-15, April.
    9. Tang, Mingfang & Zheng, Xing, 2019. "Experimental study of the thermal performance of an extensive green roof on sunny summer days," Applied Energy, Elsevier, vol. 242(C), pages 1010-1021.
    10. Yang, An-Shik & Juan, Yu-Hsuan & Wen, Chih-Yung & Chang, Chao-Jui, 2017. "Numerical simulation of cooling effect of vegetation enhancement in a subtropical urban park," Applied Energy, Elsevier, vol. 192(C), pages 178-200.
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    12. Bevilacqua, Piero & Bruno, Roberto & Arcuri, Natale, 2020. "Green roofs in a Mediterranean climate: energy performances based on in-situ experimental data," Renewable Energy, Elsevier, vol. 152(C), pages 1414-1430.
    13. Aboelata, Amir, 2021. "Assessment of green roof benefits on buildings’ energy-saving by cooling outdoor spaces in different urban densities in arid cities," Energy, Elsevier, vol. 219(C).
    14. Hong Jin & Bo Wang & Bingbing Han, 2019. "Study on Environment Regulation of Residential in Severe Cold Area of China in Winter: Base on Outdoor Thermal Comfort of the Elderly," Sustainability, MDPI, vol. 11(22), pages 1-18, November.
    15. Kim, Jimin & Hong, Taehoon & Jeong, Jaemin & Koo, Choongwan & Jeong, Kwangbok, 2016. "An optimization model for selecting the optimal green systems by considering the thermal comfort and energy consumption," Applied Energy, Elsevier, vol. 169(C), pages 682-695.
    16. Mikkola, Jani & Lund, Peter D., 2014. "Models for generating place and time dependent urban energy demand profiles," Applied Energy, Elsevier, vol. 130(C), pages 256-264.
    17. Cotana, Franco & Rossi, Federico & Filipponi, Mirko & Coccia, Valentina & Pisello, Anna Laura & Bonamente, Emanuele & Petrozzi, Alessandro & Cavalaglio, Gianluca, 2014. "Albedo control as an effective strategy to tackle Global Warming: A case study," Applied Energy, Elsevier, vol. 130(C), pages 641-647.
    18. Vera, Sergio & Pinto, Camilo & Tabares-Velasco, Paulo Cesar & Bustamante, Waldo, 2018. "A critical review of heat and mass transfer in vegetative roof models used in building energy and urban enviroment simulation tools," Applied Energy, Elsevier, vol. 232(C), pages 752-764.
    19. Fernando Alonso-Marroquin & Ghulam Qadir, 2023. "Synergy between Photovoltaic Panels and Green Roofs," Energies, MDPI, vol. 16(13), pages 1-17, July.

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