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'Whitest ever' paint reflects 98% of sunlight

bbc.com

31–40 of 271 posts

Re: 'Whitest ever' paint reflects 98% of sunlight

#31
post #11

I assume this could be useful to shield something in space with extremely specific temperature tolerances. I'm not sure about the suggestion that people are going to paint their roofs with it. People already have the opportunity to paint their roofs with cheap white paint which would provide nearly all the benefits this would, and still choose not to do it.

NYC roofs are definitely painted with reflective paint. They're usually silver-ish though.

Re: 'Whitest ever' paint reflects 98% of sunlight

#32
post #26

Earlier quoted context omitted.

>They get dirty fast do they get dirty fast in both humid and not humid climates? I would think in not humid, dry climates it might be more useful?

Dust would settle on them despite of humidity levels I think

It likely rains enough in humid environments to make dust a non issue. Both because you get vastly less dust in the air and because it washes away most dust that does show up as long as the roof has a significant slant to it.

However you don’t need white to see significant benefit over a black roof, even just green helps.

Re: 'Whitest ever' paint reflects 98% of sunlight

#33
This is mostly off-topic, but the title instantly made me think of this quote from Invisible Man:

> “Our white is so white you can paint a chunka coal and you’d have to crack it open with a sledge hammer to prove it wasn’t white clear through.”

Of course, I'm not implying any connection to this 'whitest ever' paint, but the book is quite good.

Re: 'Whitest ever' paint reflects 98% of sunlight

#34
post #21

Earlier quoted context omitted.

White roofs don’t look great which is why I think they’re largely relegated to commercial buildings instead of residential ones. They get dirty fast, are super bright and don’t fit with the traditional look for houses. On commercial flat top roofs they are hidden so it doesn’t matter if they’re blindingly bright or stained because they’re not visible.

>They get dirty fast do they get dirty fast in both humid and not humid climates? I would think in not humid, dry climates it might be more useful?

They show any dirt really clearly so for houses it’s a crummy choice because it’s not hidden on out of view (on most houses, if it’s a modern house with a flat roof you could potentially use a flat white painted roof) which means cleaning a lot.

Re: 'Whitest ever' paint reflects 98% of sunlight

#36
post #4

Someone needs to compile a list of all this fringe tech that I see popping up in my feeds, almost daily now. I know there are techpress blogs that pump out articles like this, but there doesn't seem to be an authoritative compendium of such tech anywhere on the net. I could curate this by hand with 3 hours of free time and some Red Bull I suppose. The reason I want this is because we seem to be swimming in innovation…

Custom RSS News feed?

Re: 'Whitest ever' paint reflects 98% of sunlight

#37
post #11

I assume this could be useful to shield something in space with extremely specific temperature tolerances. I'm not sure about the suggestion that people are going to paint their roofs with it. People already have the opportunity to paint their roofs with cheap white paint which would provide nearly all the benefits this would, and still choose not to do it.

What we really need is white paint in the summer, black paint in the winter - reversible roofs, if you will. That said, in the desert southwest and many places in the world, white roofs are common. I wish it were more common in the southeast...

Couldn't solar panels be used to achieve both benefits?

Re: 'Whitest ever' paint reflects 98% of sunlight

#38
post #11

I assume this could be useful to shield something in space with extremely specific temperature tolerances. I'm not sure about the suggestion that people are going to paint their roofs with it. People already have the opportunity to paint their roofs with cheap white paint which would provide nearly all the benefits this would, and still choose not to do it.

What we really need is white paint in the summer, black paint in the winter - reversible roofs, if you will. That said, in the desert southwest and many places in the world, white roofs are common. I wish it were more common in the southeast...

If you look at old architecture in rural Georgia and Alabama. Houses are on rocks raised above the ground (air circulates underneath), 10 ft ceilings, a huge attic fan to pull cool air in in the evening, tall trees planted next to the house for shade (we have 4 pecan trees), and reflective tin roofs (if still shiny). This helped significantly to cooling in the summer. Winters aren't cold enough to warrant more than a fireplace in the common area. We have an old farm house built in the 1920's...the old original part of the house doesn't get uncomfortable until the temperatures outside get above 100. A newer part of the house with standard 9ft ceilings built in the 70's gets very warm and uncomfortable.

Re: 'Whitest ever' paint reflects 98% of sunlight

#39
post #11

I assume this could be useful to shield something in space with extremely specific temperature tolerances. I'm not sure about the suggestion that people are going to paint their roofs with it. People already have the opportunity to paint their roofs with cheap white paint which would provide nearly all the benefits this would, and still choose not to do it.

What we really need is white paint in the summer, black paint in the winter - reversible roofs, if you will. That said, in the desert southwest and many places in the world, white roofs are common. I wish it were more common in the southeast...

Black in the winter would make the building lose heat faster - especially during the night.

Re: 'Whitest ever' paint reflects 98% of sunlight

#40
post #2

Also: Black 3.0, the purchasable variant of Vantablack For sale at: https://www.culturehustleusa.com/

see also, color manufacturers that will sell to anybody who ISN'T Anish Kapoor https://www.dezeen.com/2017/07/07/anish-kapoor-banned-from-u...

I know this is such a small microcosm of the world, but I really love to see, just once in a while, that someone with power uses their power for the greater good and not for selfish benefit (realistically "we won't sell to Kapoor" is a marketing spin but it's still a risk and a strong statement).
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