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

Salah Eddine Ouldboukhitine, Rafik Belarbi, David J. Sailor

Research output: Contribution to journalArticle

42 Scopus citations


In the present work, an experimental urban canyon (scale 1:10) with 4. cm 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.

Original languageEnglish (US)
Pages (from-to)273-282
Number of pages10
JournalApplied Energy
StatePublished - Feb 2014



  • Albedo
  • Canyon street
  • Energy performance
  • Green roofs
  • Heat and mass transfer

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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