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Posted on 9/20/21 at 8:26 am to stout
I bet it fricks up your cell signal too
Posted on 9/20/21 at 8:30 am to ell_13
I already have shite cell coverage at my house and had to install an external to internal antenna and amplifier
Posted on 9/20/21 at 8:31 am to stout
quote:
They do already make radiant paints. I know of one you can buy for about $300 for 5 gallons that is called Lo/Mit-II and use it on the backside of your rafters and decking in your attic. It is a radiant barrier paint but it is less effective than the roll foil radiant barrier. When the paint is installed correctly, it will reflect about 75% of the radiant heat vs actual radiant barrier blocking 97% of radiant heat but neither of those claims to actively make an area cooler than surrounding temperatures like the paint in the article does.
Well no. Because it will just radiate inside the house.
What they are saying they gave a paint you would put on OUTSIDE and would reflect most of the solar energy and emit more thermal radiation than it absorbs, causing a cooling effect.
Obviously won’t do anything about humidity though.
Posted on 9/20/21 at 8:33 am to stout
I have shite service too. House built in 2018 and I blame that foil insulation they put under the roof these days. My attic doesn't get nearly as hot or cold with it, but man does it frick with the signal.
Posted on 9/20/21 at 8:34 am to stout
That’s racist…
Posted on 9/20/21 at 8:34 am to stout
Wishful thinking. Could help cool but not eliminate need for A/C
10kw = 34,122 BTU/hr
Not quite a 3 ton unit (12,000 btu per ton)
Also you need to cool air to dew point in order to remove moisture. Any humid climate will need an A/C system just for de-humidification. Especially a system to requires outside air.
Next, once the pint gets dirty it will quickly lose its reflective power.
10kw = 34,122 BTU/hr
Not quite a 3 ton unit (12,000 btu per ton)
Also you need to cool air to dew point in order to remove moisture. Any humid climate will need an A/C system just for de-humidification. Especially a system to requires outside air.
Next, once the pint gets dirty it will quickly lose its reflective power.
Posted on 9/20/21 at 8:37 am to stout
quote:This is what it would look like if paint could dance:
The paint has now made it into the Guinness World Records book as the whitest ever made.
Posted on 9/20/21 at 8:38 am to tigeraddict
quote:Yep. It was one of the downfalls of the attempt to use sunlight reflected off of mirrors to boil water and create steam to run a generation turbine. Look up Ivanpah. In the desert... surrounded by mirrors. They didn't anticipate how often the mirrors would need to be cleaned from sand/dust.
once the paint gets dirty it will quickly lose its reflective power.
Posted on 9/20/21 at 8:40 am to stout
quote:bullshite.
or even eliminate the need for air conditioning, scientists say
quote:bullshite.
Using this new paint to cover a roof area of about 1,000 square feet could result in a cooling power of 10 kilowatts. “That’s more powerful than the air conditioners used by most houses,” Ruan said.
quote:What are the unintended consequences of this?
The paint reflects 98.1% of solar radiation while also emitting infrared heat
Posted on 9/20/21 at 8:41 am to stout
quote:
could eliminate the need for A/C
Quite possibly the dumbest statement ever.
Please think about it
Posted on 9/20/21 at 9:32 am to stout
quote:
Barium sulphate
from the guiness link:
quote:
Seeking to highlight the potential benefits of radiative cooling, Professor Xiulin Ruan (who was part of the study) said: “If you were to use this paint to cover a roof area of about 1,000 square feet [93 m2], we estimate that you could get a cooling power up to 10 kilowatts. That’s more powerful than the air conditioners used by most houses.” Scaling that up, the scientists estimate that it would only require 0.5–1% of Earth’s surface to be coated in this paint (e.g., by painting roofs) to reverse global warming to date.
Oil-based paint (oh, the irony). From the ACS website:
quote:
The BaSO4-acrylic paint is developed with a 60% volume concentration to enhance the reliability in outdoor applications, achieving a solar reflectance of 98.1% and a sky window emissivity of 0.95.
Posted on 9/20/21 at 9:42 am to HoustonGumbeauxGuy
quote:
Any home below the Mason Dixon line will have no use for such paint
I could see it helping lower electric bills by reducing run time of the AC
Posted on 9/20/21 at 9:59 am to stout
To be fair, the article is not specific to our region. There are marginal areas of the US and the world where this could eliminate A/C if the claims are true.
Posted on 9/20/21 at 10:00 am to stout
Where does the heat go when it is reflected? I know it doesn't go back to the sun. Does it stay in the atmosphere?
Posted on 9/20/21 at 10:03 am to stout
Racist bastards couldnt make a colored magic paint?
Posted on 9/20/21 at 10:06 am to stout
quote:
neither of those claims to actively make an area cooler than surrounding temperatures like the paint in the article does
It’s an interesting claim. At first I was going to say that I think it would probably be more accurate to state that a surface coated with the paint “heats up less than the surrounding area” when exposed to sunlight. Using the term “cooled” seems a bit misleading because it implies active removal of heat from the surface.
But then I re-read this piece:
quote:
The paint reflects 98.1% of solar radiation while also emitting infrared heat. Because the paint absorbs less heat from the sun than it emits, a surface coated with this paint is cooled below the surrounding temperature without consuming power.
So basically they are saying that the infrared emissions from the coating more than offset the 1.9% of solar radiation that still gets absorbed. If that is indeed the case, then the end result would be active cooling of the surface.
That being said, I’m skeptical that this can lead to active cooling inside a building. As the surface cools, it’s going to develop a temperature gradient with its surroundings and consequently absorb more heat via convention and conduction. The question becomes how much heat actually gets absorbed from the inside of the building. The air on top of the painted surface is going to be much hotter because A) it’s (presumably) hot outside and B) the air is being heated by sunlight from both directions - the direct heat from the sun and the reflected heat from the paint. It seems to me like most of that cooling would be wasted on the ambient air.
So it’s not good enough to just paint the roof. You would also need to design the building to both minimize convective heat transfer from the roof to the atmosphere and also maximize heat transfer from the interior to the roof. In hot climates, this would be the exact opposite of traditional designs.
ETA: All of that said, it would almost certainly result in an overall energy efficiency improvement, just by absorbing less overall heat from the surroundings than the alternative.
This post was edited on 9/20/21 at 10:08 am
Posted on 9/20/21 at 10:09 am to stout
quote:
stout
Side question
quote:how well does this stuff work?
but it is less effective than the roll foil radiant barrier
My attic is easily assessable and I’m able to stand in it easily. I don’t think it would be hard for me to install some.
My upstairs is always 7-8° hotter than downstairs.
I’ve thought about installing a fan up there since I’ve already got a circuit wired.
Posted on 9/20/21 at 10:10 am to LSUSkip
quote:
Where does the heat go when it is reflected? I know it doesn't go back to the sun. Does it stay in the atmosphere?
Some of it gets either absorbed by the atmosphere or reflected back to the surface by the atmosphere - this is the “greenhouse effect.”
The rest is radiated into space.
Posted on 9/20/21 at 10:17 am to stout
What happens when it gets dirty?
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