The results of the simulation for Cairo, Fig. 5, show the climate
dependence of the south Mediterranean area. Heating demand is
low and the best solutions are cooling efficiency driven. CR lead to
40%, while moderated advantages are calculated for the metallic
roof High differences are found for the green roof configurations:
the wet green roof is the best performing solution, thanks to a
cooling demand similar to the cool roof and a heating demand
slightly higher than the conventional roof. This configuration leads
to 45% total energy savings. Actual rainfall and dry GR performances
practically give the same performance with 13% energy savings
respect to ST, with a 10% reduction of the cooling demand.