New white paint can cool houses
more than air conditioning - study
Jerusalem Post,
by
Staff
Original Article
Posted By: Imright,
5/10/2021 9:18:04 AM
A new type of the color white, said to be the whitest white color ever created, can be used to cool houses to reduce the need for air conditioning, according a new study published by Purdue University. This new white paint can reflect 98.1% of sunlight, a rise from the previous record of 95.5%, which allows it to send infrared heat away from the surface it is coating. To measure how well the color helps cool down its environment, they used thermocouples – a high accuracy temperature reading device, which found that the surface with the paint was about seven degrees Celsius colder than its surroundings during the night,
Reply 1 - Posted by:
downnout 5/10/2021 9:19:13 AM (No. 780617)
A quick question...how does it cool a room without windows?
4 people like this.
I don't know if this is related, but many of the new construction homes in Baton Rouge are white.
However, given our humidity issues, they will likely be turning green....this should result in a big increase in business for power washers.
16 people like this.
Reply 3 - Posted by:
brother ram 5/10/2021 9:30:54 AM (No. 780629)
According to AOC this is just another example of "White Privilege".
15 people like this.
Reply 4 - Posted by:
Delilah 5/10/2021 9:32:06 AM (No. 780632)
Wouldn't the roof need to be white too? I debated about the color when I had a metal roof installed several years ago and ended up with a black roof which helps keep the house warm in winter. White may work in warmer climates but not necessarily in areas that have cold winters.
7 people like this.
Reply 5 - Posted by:
Blue-Z-Anna 5/10/2021 9:39:05 AM (No. 780645)
So....a 3% improvement in reflectivity will make AC unnecessary?
Who ARE these people and where did they go to school?
27 people like this.
Reply 6 - Posted by:
Avikingman 5/10/2021 9:43:21 AM (No. 780650)
Who knew? That white paint reflected 98% of sunlight. So we're all left in the dark?
And where does the reflected heat go? Into the atmosphere? Huh? Is this only in Jerusalem?
8 people like this.
Reply 7 - Posted by:
ladydawgfan 5/10/2021 9:53:53 AM (No. 780663)
I'm sure my landlord will be thrilled when I paint my condo white!! Meanwhile, this is Florida and you will pry my central air conditioning out of my cold dead hands!!
10 people like this.
Reply 8 - Posted by:
kono 5/10/2021 9:54:11 AM (No. 780664)
Sounds like a little bit of a solar-energy farm setup. Careful walking around mirrors in the bright sunshine, especially where multiple reflections converge. The smell of frying soft tissue comes to mind.
7 people like this.
Reply 9 - Posted by:
red1066 5/10/2021 10:49:28 AM (No. 780722)
I remember about 30 years ago I worked for a large car leasing company, and the sales person at the dealership in Palm Springs wondered why a client of ours would want a black car for Palm Springs. He said it wasn't unusual for the heat in Palm Springs to melt the plastic parts inside a dark colored car. He said even the steering wheel would get soft and bendable on some cars.
7 people like this.
Reply 10 - Posted by:
stablemoney 5/10/2021 10:53:28 AM (No. 780726)
So it saves a few dollars on cooling in the summer---but costs more in winter to warm the house. Maybe no a/c in Indiana, but I think you are going to need more than paint for Texas heat.
3 people like this.
Reply 11 - Posted by:
skacmar 5/10/2021 10:58:26 AM (No. 780739)
Doesn't paint have dangerous chemicals made with petroleum products? Doesn't paint make toxic waste? Look for environmental groups to be against something as simple as paint to save help save the world from their precious Global Warming scam because it will be bad for the environment. They will also claim that evil capitalist corporations might benefit from the sale of paint and the equipment necessary to paint homes. I can see the new Democrat talking points talking down house painting!
5 people like this.
Reply 12 - Posted by:
Clinger 5/10/2021 11:03:40 AM (No. 780747)
That's going to really stink when it's below zero.
5 people like this.
Reply 13 - Posted by:
Rumblehog 5/10/2021 11:13:07 AM (No. 780764)
I hate to tell them, but heat transfer will take place from the outside ambient air until thermal equilibrium is reached. White might be nice for reflecting the Sun's rays, but heat still comes through the walls and floor.
7 people like this.
Reply 14 - Posted by:
mc squared 5/10/2021 11:51:02 AM (No. 780817)
2.5%? Why is this news? Those of us in the south and west knew this for centuries.
6 people like this.
Reply 15 - Posted by:
DVC 5/10/2021 12:32:08 PM (No. 780873)
I call bull. "Cool MORE than AC?" no, the very best paint can, at BEST keep the radiative gain down to a fraction of what it would be. But there are two types of heat gain, radiative and conduction. And if you 100% eliminate radiative heat gain (impossible), you still have conductive heat gain on a hot day. If it is 100F outside, the best you can hope for without AC is to delay the increase in temperature with lots of insulation, but over time, you will reach an equilibrium temp, even with massive, expensive insulation. If you live some place where the daytime temp is 100F and the nighttime temp is 50 F, then with enough insulation, you might get the house (if there is zero air exchange, and several other unrealistic assumptions) to an average temp of 75. But, if you live where the average day/night air temp is 85....without AC, even with if you pretend that there is no radiative gain, your home will eventually stabilize at 85.
The headline is BS, and I won't even bother with their 'fantasy science' paint. Sure, it may be a better reflector of incoming radiative heat. And that can help reduce the AC load. OK, but not a huge deal. The ecocrazies are always developing some no "massive breakthrough"....which ISN'T.
I started following this stuff when I studied solar engineering in college, and for a while bought into their stories. Eventually, the real world kicked in and while I have designed and built a "solar powered home" in a remote mountain area where electricity wasn't available....it is actually a falsehood to call it "solar powered". It is really propane and wood powered, with solar lighting and a solar sat TV. 95% of the energy use is wood and propane, actually. Only the very minimum possible electrical is solar.
3 people like this.
Reply 16 - Posted by:
judy 5/10/2021 5:01:48 PM (No. 781117)
It's common knowledge ...white reflects heat... put on 100% white cotton clothes ... go outside in the sun....it's amazing how comfortable you are.
0 people like this.
Reply 17 - Posted by:
mifla 5/11/2021 6:53:39 AM (No. 781568)
Sounds kinda of racist...
0 people like this.
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