3 ms·
This seems really viable. Deflecting is still better than absorbing on the roof top, since roof top means 100% warmth absorption and deflection always less tha
by wellboy 9y ago
This seems really viable.
Deflecting is still better than absorbing on the roof top, since roof top means 100% warmth absorption and deflection always less than 100%, probably only a fraction of that.
- sliken 9y agoYour assuming that the atmosphere is more transparent to infrared (from a hot roof) then optical ranges (from a white roof).
- jwilk 9y agoNo? The atmosphere is more transparent to sunlight than to IR, thanks to greenhouse gases. That's why absorbent roofs heat the Earth more than reflective roofs.
- wellboy 9y agoNo. As an a example, I'm assuming that hot roofs absorb 70% of the incoming energy and reflect 30%, where reflectig roofs absorb 10% and reflect 90%. These numbers can be a bit different, but I'm pretty sure that hot roofs absorb a multiple of energy compared to reflecting roofs. Makes sense?