Several numerical studies were carried out in the past years to
assess the energy performance of buildings equipped with cool
roofs. The impact of cool roofs on a single floor detached house
placed in different climatic zones of the planet world was calculated
for insulated and not insulated dwellings [17]. The cooling
energy consumption reduction was 18% and 93% increasing the roof
solar reflectance from 20% to 85%. Three typical building models
were developed respectively for: a residential building, an office
and retails store, differentiated by age (before and after 1980). The
impact of cool roof ensured global energy savings from 7% to 25%
according to the different age and building type for several US climates
[18]. Other studies were focused to limited geographical
sites, as Jordan or Honk Kong [19,20]. Other studies faced the cool
roof positive impact evaluated as an additional thermal insulation
[21]. The results of the analysis revealed that the integrated daily
roof heat gain was not dependent on its thermal mass. An energy
analysis run proved that the daily heat flow in a roof with SR of 0.65
and a thermal resistance (R-value) of 1.1 m2 K/W was equivalent to
the flow in a roof with SR 0.3 and R-value 2.2 m2 K/W.