Quote:
Originally Posted by freebeard
1) It's at ?t=628. Ultrawhite paint is 88.6%, a silvered mirror is 89.5%.
2) Don't know
3) [citation needed]
4) Disagree. It's reflecting the heat load rather than cooling it.
The part significant to me is the mechanism, a three part precursor, a phase inversion, then washing one part, sintering away the other leaving an aluminum aerogel.
The resulting aluminum plate is white because of it's nanoscale structure not pigment. I suspect it's similar to the vacuum airship 'tic-tac' drones the Navy pilots are reporting offshore of California and Florida. |
2) When it's 'hot' and 'humid', the human body cannot reject heat through perspiration. The air is already saturated with water vapor, and your sweat just sits on your skin, never evaporating ( presently killing Guatemalan cane cutters by renal failure [ it was 119-F in Myanmar the other day ]). In order to 'cool' humans, you must dehumidify the air. The AC unit takes the air temp. down below dewpoint, the moisture collects on the evaporator coil, and drains out of the unit.
3) The American Society of Heating Refrigeration and Air conditioning Engineers ( ASHRAE ) publishes a HANDBOOK which contains all the necessary data from which to design HVAC systems.
Within the handbook, you'll find psychrometric charts, which allow you to study, and design for the amount of heat energy ( enthalpy )within a pound of dry air, for any given environmental condition. This is where you'll see the dewpoints ( temp at which water vapor condenses out of the air as liquid water ). By definition, the temp at the bottom of all 'clouds' is exactly at the 'dewpoint' temperature. If you cool without dehumidifying, you'll reach dewpoint, 100% relative humidity, and the water vapor will condense on the interior surfaces of the room, where 'killer' stachybotrys mold can take hold, requiring the building to be condemned.
4) If the temperature of the attic air in a ventilated attic, right at the top of the thermal insulation package above the ceiling, is no more than ten degrees above the outdoor temperature, then you're 'golden', as far as your AC system is concerned. It doesn't matter if the roof is a million-degrees!
The roof could be black and it might not make any difference.
Sure, your head might cook standing in there, but it doesn't make any difference to the house, as long as the attic is properly ventilated.
Insulation cannot 'see' infrared radiation that you feel standing there. Only delta-T. You could spend a fortune on roof coatings of extreme albedo, and see ultimately see zero difference in your air conditioning bill.
I used to see charlatans at HOME DEPOT all the time, deceiving uneducated home owners, with the infrared 'scam' hiding in plain view.