[en] The use of recycled materials and porous aggregates such as rubber crumbs and volcanic gravel (pozzolana) for the drainage layer can lead to improving thermal behaviour of the green roofs. On the other hand, the thermal performances of green roofs can be affected by the thickness of substrate and drainage layer. Therefore, the main objective of this study was to adapt modelling characteristics for different thicknesses of substrate and drainage layers used under constant and variable temperatures and solar radiation: specific rubber crumbs and volcanic gravel behaviour has been modelled. The simultaneous heat and moisture transfers within the green roof were estimated as well. According to the results, the 9cm substrate was recommended to be used for the green roofs, once the thickness of drainage layer was 4cm. Moreover, the optimum thickness of pozzolana and rubber crumbs as drainage layer was 6cm and 7cm, respectively, once the thickness of the substrate was kept constant (5cm). By increasing the thickness of substrate and drainage layers, the fluctuation of internal ceiling temperature in the green roof models with the presence of humidity decreased, but not as much as that in the green roof models without the presence of humidity.
Disciplines :
Civil engineering
Author, co-author :
Kazemi, Mostafa ; Université de Liège - ULiège > Département ArGEnCo > Département ArGEnCo
Courard, Luc ; Université de Liège - ULiège > Département ArGEnCo > Matériaux de construction non métalliques du génie civil
Language :
English
Title :
Modelling thermal and humidity transfers within green roof systems: effect of rubber crumbs and volcanic gravel
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