This is a question that we often hear… ” And solar panels, this is better no ? “ . But to oppose the choice of the pv to the cool roofing, it is limited to a single solution for real-time energy optimization. And it is a pity ! Especially thatthere are net benefits to combine the two solutions on the same roof.
The proper question to ask, so it would be rather : ” Why and how solar panels work better on the covered roof cool roof ? “ Cool Roof you explain what it is in this article.
A “cool roof” (literally “cool-roof” in good French) is a roof cover ofa coating reflective and emissive (usually white).
There are two effects of the cool roofing on the solar panels installed on the same roof:
In fact, the high reflectivity of the coating, Cool Roof allows, compared to a roof covered with bitumen or metal,:
A solar panel loses 0.5% of power per degree above 25°C.
The coating, Cool Roof, dramatically reducing the temperature experienced by the panel, it is possible toincrease up to +10% of the power generated by the panel (relative to an environment ” classic “).
A solar panel that captures not only the direct radiation of the sun, but also the radiation reflected (albedo) on the surfaces surrounding (roofs, floors, walls, etc.).
It is estimated that if 25% of the floor area was ” painted in white “, the productivity gain of the panels would be +48%.
Unlike modules, single-sided, these new modules “bifaciaux” is also taken up by the radiance reflected in the under-face of the panel. Thus, the more the environment and the support of the panel is reflective, the greater the efficiency of the panel will be high.
Increase of up to 25% of the gain of bifacialité !
20 cm in height above the roof membrane roof white reflectance of 78%, 9 month period.
Low-tech innovation for all