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(WIBC Indianapolis)   New 'super-white' paint that reflects 95.5 percent of sunlight off buildings is so good at reducing heat it could one day replace air conditioning. Subby would like to have them test this in Houston during the month of August   (wibc.com) divider line
    More: Unlikely  
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1057 clicks; posted to STEM » on 24 Oct 2020 at 9:30 PM (4 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



47 Comments     (+0 »)
 
View Voting Results: Smartest and Funniest
 
2020-10-24 8:56:41 PM  
Unfortunately I have to close my eyes and feel around for the door handle to insert the key in. Long ago, my eyes fried outta my head when I took a good look at my place at the wrong time of day.
 
2020-10-24 8:57:23 PM  

JohnnyApocalypse: Unfortunately I have to close my eyes and feel around for the door handle to insert the key in. Long ago, my eyes fried outta my head when I took a good look at my place at the wrong time of day.


i uhhhh guess i would be closing my eye pits out of habit when i concentrate? feh. lame
 
2020-10-24 9:01:36 PM  
The difference is in the paint's recipe: it's filler is calcium carbonate, a compound found in rocks and seashells.

FTFA

Sounds like a whitewash to me.
 
2020-10-24 9:10:55 PM  

Fingerware Error: The difference is in the paint's recipe: it's filler is calcium carbonate, a compound found in rocks and seashells.

FTFA

Sounds like a whitewash to me.


Fark user imageView Full Size
 
2020-10-24 9:40:50 PM  
Successfully fighting climate change really will take an "all of the above" strategy.
 
2020-10-24 9:48:41 PM  
So a mirror?
 
2020-10-24 9:49:50 PM  
In Houston?  Unless it's impervious to mildew and dirt, it won't be reflective long.
 
2020-10-24 9:50:36 PM  
Wouldn't having walls which are cooler than the surrounding air cause condensation? Potentially useful outside, but indoors might cause problems.
 
2020-10-24 9:52:47 PM  
No air conditioning in Florida? You'd still have to fit houses with dehumidifiers, otherwise enjoy your mold.
 
2020-10-24 9:57:05 PM  
Available soon to buy for anyone who is not Anish Kapoor.
 
2020-10-24 9:58:58 PM  

greatgodyoshi: No air conditioning in Florida? You'd still have to fit houses with dehumidifiers, otherwise enjoy your mold.


You'd still have ambient temperatures to still deal with getting through the windows and insulation.  AC won't be going any where.  You just wouldn't need as much.
 
2020-10-24 10:15:00 PM  
Fark user imageView Full Size
 
2020-10-24 10:18:36 PM  
"Yet across the gulf of space, minds that are to our minds as ours are to those of the beasts that perish, intellects vast and cool and unsympathetic, regarded this earth with envious eyes, and slowly and surely drew their plans against us."

 
2020-10-24 10:20:04 PM  
Feh... wrong thread. :)
 
2020-10-24 10:54:39 PM  
Mirrors work also.. and reflected 100% of the sunlight
 
2020-10-24 11:06:10 PM  
I can barely keep my eyes open on sunny days with snow on the ground as it is. But I guess we'll just paint our houses black for the winter so that should balance it out.
 
2020-10-24 11:10:41 PM  
The paint is white in color, non-toxic, and it can be sprayed or brushed like any other paint. The difference is in the paint's recipe: it's filler is calcium carbonate, a compound found in rocks and seashells. The paint also has layers of particles that are different sizes, which allows the paint to defend against a wider range of sunlight wavelengths.

Sounds like a chemical to me! I don't like chemicals! I only use organic free-range paint.
 
2020-10-25 12:11:24 AM  
Painting your house or apartment building white, especially if your building has a shallow sloped roof or a flat one, has been a thing in basic architectural design since the 1970s, subby.

Well, correction, technically it's "been a thing" since prehistory, as that's one of the reasons adobe was so popular in desert regions in both the americas and the Mediterranean for millennia, but I mean making a standard practice of adding white to non-white buildings to save on AC specifically.

The new material is pretty cool (heh) but TFA is doing that pop science article thing where they misunderstand what a new development is and instead write an article on the premise that the entire field was only just invented.

// An individual house still has to deal with the convection component, so you'll still need AC, but larger experiments with white roofing have actually demonstrated that with enough whitewash you can quite literally drop the outside temperature of a city block by five degrees relative to the blocks around it during hot summer days.
 
2020-10-25 12:50:03 AM  

redbucket: So a mirror?


No, diffuse vs specular reflection. Diffuse means the rays scatter in all directions. Specular means they only reflect in one direction so an image can form. Mirrors also don't reflect that much total light. Some gets trapped in the mirror due to total internal reflection.
 
2020-10-25 1:04:00 AM  
I applaud the effort. I am skeptical about the math and practical effectiveness. And calcium carbonate just makes me chuckle.

You know, theoretically, if you reflect the sunlight, then it is not absorbed. The heat does not have to be kept from the interior by insulation, and it will not raise the interior temperature by much if it does penetrate.

Wouldn't you want a different color of house than just white? What about winter? What about better insulation and air gaps? Why not titanium oxide? Titanium is less reactive than calcium. It is widely used in paints already. And just for laughs, because TiO2 is a semiconductor, why not just make huge panels of it and generate electricity while you cool your house?

Yippee. This is fun. Let's do some more.
 
2020-10-25 1:16:21 AM  
And I will make the tired suggestion that anyone in a hot climate in the Northern Hemisphere should have the smallest south facing wall possible anyway. Paint it your favorite color. Slope that roof to give a high north face for heat exchange and shade, and pack up your roof with solar panels. Use your solar to run your AC and heat pumps and you are done. Ta Dah. Give the paint to your neighbor for Father's Day.
 
2020-10-25 1:26:48 AM  
"Oh, why's the paint gotta be white?" -- Chris Rock
 
2020-10-25 1:49:19 AM  

FormlessOne: "Yet across the gulf of space, minds that are to our minds as ours are to those of the beasts that perish, intellects vast and cool and unsympathetic, regarded this earth with envious eyes, and slowly and surely drew their plans against us."


User name checks out.
 
2020-10-25 2:34:39 AM  
I'll get excited when they find a way to get the dirt that builds up on top of the paint to reflect 95.5% of sunlight.
 
2020-10-25 4:43:29 AM  

hissatsu: The paint is white in color, non-toxic, and it can be sprayed or brushed like any other paint. The difference is in the paint's recipe: it's filler is calcium carbonate, a compound found in rocks and seashells. The paint also has layers of particles that are different sizes, which allows the paint to defend against a wider range of sunlight wavelengths.

Sounds like a chemical to me! I don't like chemicals! I only use organic free-range paint.


pbs.twimg.comView Full Size
 
2020-10-25 7:46:11 AM  
Difficulty:  its manufacture depletes the ozone and exposure to it causes birth defects, cancer, and a predilection for listening to show tunes and performing jazz hands.
 
2020-10-25 9:00:10 AM  
Could you imagine trying to navigate a city of buildings painted like this in the middle of a clear day?

No thanks.
 
2020-10-25 9:01:18 AM  

Excelsior: hissatsu: The paint is white in color, non-toxic, and it can be sprayed or brushed like any other paint. The difference is in the paint's recipe: it's filler is calcium carbonate, a compound found in rocks and seashells. The paint also has layers of particles that are different sizes, which allows the paint to defend against a wider range of sunlight wavelengths.

Sounds like a chemical to me! I don't like chemicals! I only use organic free-range paint.

[pbs.twimg.com image 850x478]


I'd like to point out that is a man bred banana, not a "natural" or wild banana.
 
2020-10-25 9:21:54 AM  
solar gains are only part of the heat gains of a structure.
 
2020-10-25 12:05:39 PM  
They used something similar on this building to minimize solar gain and provide solar shading. In Chicago...

upload.wikimedia.orgView Full Size


Then after the built it people noticed that "keeping a building cool" is NOT a pressing issue in Chicago for most months of the year.

In infrared it looks like this:
buildingscience.comView Full Size


Yup. They built an 80 story heat exchange in the middle of a city noted for cold winters.

But because of how building energy sustainability scoring was written at the time, focusing on avoiding heat gain, it scored very well. The rules have since been changed.
 
2020-10-25 12:09:31 PM  

Target Builder: In infrared it looks like this:
[buildingscience.com image 225x300]

Yup. They built an 80 story heat exchange in the middle of a city noted for cold winters.

But because of how building energy sustainability scoring was written at the time, focusing on avoiding heat gain, it scored very well. The rules have since been changed.


Everything about that building, from an energy perspective, is a huge lesson in what not to do.
I'm an architect with a specialization in building envelope science, practicing in an even colder climate than Chicago. If you want lessons on how to reduce energy costs in buildings, look up north - we've been the experts for 50 years - and this white paint stuff is nonsense.
 
2020-10-25 1:07:53 PM  
Will it melt the cars and sidewalk across the street?
 
2020-10-25 1:13:32 PM  

dittybopper: Difficulty:  its manufacture depletes the ozone and exposure to it causes birth defects, cancer, and a predilection for listening to show tunes and performing jazz hands.


Well, that explains a lot...

Fark user imageView Full Size
 
2020-10-25 1:19:22 PM  
It is not an approved color by my HOA.
 
2020-10-25 1:32:39 PM  
Would the universe implode if it gets mixed with some Vanta Black?
 
2020-10-25 1:36:39 PM  

johnphantom: Could you imagine trying to navigate a city of buildings painted like this in the middle of a clear day?

No thanks.


There's a reason the buildings on the Mediterranean coast are pastels. When they painted them white, it damn' near blinded people looking at them from boats.
 
2020-10-25 1:38:19 PM  
The future's so bright we'll have to wear shades.

/ Investing in sunglasses tomorrow.
 
2020-10-25 3:47:53 PM  

Fingerware Error: The difference is in the paint's recipe: it's filler is calcium carbonate, a compound found in rocks and seashells.

FTFA

Sounds like a whitewash to me.


Doesn't need to reflect all light, just the IR, I would think?
 
2020-10-25 3:54:10 PM  

Truck Fump: Doesn't need to reflect all light, just the IR, I would think?


The blackest flat black you can find should absorb other colors and transform that light into heat, I think.
 
2020-10-25 7:13:26 PM  
I heard that a huge order of ultra white paint was just placed for delivery to 1600 Pennsylvania Ave, Washington, D.C.
 
2020-10-25 7:32:24 PM  

SirDigbyChickenCaesar: solar gains are only part of the heat gains of a structure.


Do you have info on this? Genuinely asking.
 
2020-10-25 8:14:13 PM  

Naritai: SirDigbyChickenCaesar: solar gains are only part of the heat gains of a structure.

Do you have info on this? Genuinely asking.


Regardless of how well you insulate your house, the inside temp will eventually rise to the outside temperature without heat or ac.  Greater insulation just increases the time it takes.  Then you have basic infiltration of outside air.  This paint does nothing in regards to that.
 
2020-10-25 8:31:21 PM  

SirDigbyChickenCaesar: Naritai: SirDigbyChickenCaesar: solar gains are only part of the heat gains of a structure.

Do you have info on this? Genuinely asking.

Regardless of how well you insulate your house, the inside temp will eventually rise to the outside temperature without heat or ac.  Greater insulation just increases the time it takes.  Then you have basic infiltration of outside air.  This paint does nothing in regards to that.


plus theres that funny way that sunlight goes right through these things called windows and then gets absorbed and converted to heat by all the furniture, floors, etc inside the offices.  no matter what color you paint anything else unless you paint right across the windows a huge amount of your buildings surface is still going to let light in.
 
2020-10-25 11:10:20 PM  
I write a proposal about this exact thing when I was in The Air Force. For some reason all the doors and trim on our base was dark chocolate brown.

In the summer in Texas, the doors were so hot, you needed gloves to touch them. Inside, the doors radiated doors much heat, you had to run the AC on high.

I calculated the base could save $150,000 a year by painting the doors beige.

They didn't care.
 
2020-10-25 11:42:34 PM  
Im in Canada.  How about a paint so black that it will replace central heating.
 
2020-10-26 12:55:14 AM  
It takes more energy to heat interior spaces in the United States each winter than it takes to cool the interior spaces in the summer.  You want buildings to warm up from solar radiation in the winter. So unless you are willing to paint the building twice a year, you will lose more total energy than you gain.
 
2020-10-26 9:30:26 AM  
Bonus benefit: Helps protect your home against pesky nuclear blasts.

The House In The Middle (1954)
Youtube pGJcwaUWNZg
 
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