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Magic material promises free cooling. The end of air conditioning ?
Ray Diator
lop guest
User ID: 471784
11-08-2018 05:34 PM

 



Post: #1
teach Magic material promises free cooling. The end of air conditioning ?
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Today around 15% of electricity is used for air conditioning. This figure is likely to increase as people in Asia, South America and Africa get richer so the idea of free cooling is very interesting. Thermal energy naturally flows from a high temperature body to a lower temperature one. In order for air conditioning to work, in reversing the heat flow from a cool interior to a hot exterior, mechanical work has to be added in the form of pumped refrigerant. If it were possible to find somewhere cooler for the heat inside the building to flow to you could achieve free cooling.

That somewhere is outer space, which is very cold, -269 centigrade. This fact was made use of by ancient Iranians who made ice in the dessert during the night to store in ice houses.

https://www.fieldstudyoftheworld.com/per...ce-desert/

If thermal energy can be radiated away to space without absorbing a greater amount of incoming energy in the form of sunlight or thermal radiation from the environment then an object will get cooler. The problem is that during the day most objects absorb the energy of sunlight, solar radiation, heating up. They also absorb some thermal radiation ( heat ) from the environment. If there was a way of not absorbing sunlight while also radiating heat out to cold outer space then objects could be cooled below air temperature without the need for machinery or e.g water. This challenge has been cracked by teams of researchers in two American universities.

( more to come )
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LoP Guest
lop guest
User ID: 471784
11-08-2018 05:48 PM

 



Post: #2
RE: Magic material promises free cooling. The end of air conditioning ?
Not absorbing the energy of sunlight, solar radiation is relatively easy. Polished metal surfaces reflect over 99% of incoming solar radiation. Not absorbing thermal energy from the environment but instead radiating thermal energy out into space is much trickier. Greenhouse gasses in the atmosphere act like a blanket, absorbing and re-radiating thermal energy back to Earth. You may have noticed that on clear, dry cloudless nights things facing skywards cool quickly, so much so that they may get frost on them. That's because the water vapour and clouds that act as this thermal blanket are missing and the object can radiate its heat out to space more easily. This is the reason the upper surfaces of cars get frost first,

http://stanleyquan.com/wp-content/upload...-frost.jpg

and if you park under a tree or awning your car will have less ( or no ) frost on the roof compared to your neighbours. The tree are re-radiating thermal energy back to your car keeping it warmer just as buildings are radiating thermal energy to the sides of your car, keeping them frost free.

( more to come )
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Felix
Jumpin Fractals
User ID: 472584
11-08-2018 05:56 PM

Posts: 2,116



Post: #3
RE: Magic material promises free cooling. The end of air conditioning ?
So what is this 'magic' material?

The mice always win but the cats are always well fed

LIBRARIES of KNOWLEDGE

http://lunaticoutpost.com/thread-11057.html
(Not my thread. I just like it that much)
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LoP Guest
lop guest
User ID: 471784
11-08-2018 06:00 PM

 



Post: #4
RE: Magic material promises free cooling. The end of air conditioning ?
The trick is to make every day and night work like the dry cloudless desert night and this has now been achieved. There is a "thermal window" a range of frequencies that are not absorbed by any greenhouse gasses and allow energy to be radiated out into space in order to cool objects. These frequencies are shown in the blue band in this diagram.

https://upload.wikimedia.org/wikipedia/c...ission.png

Generally this is taken to be a wavelength of 8 to 13 microns ( millionths of a metre )

The first team to attempt to exploit this hole has lead by Aaswath Raman at Stamford University who built a material up using semiconductor fabrication techniques and used it to start a company called Skycool.





https://www.youtube.com/watch?v=7a5NyUITbyk

( more to come )
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LoP Guest
lop guest
User ID: 471784
11-08-2018 06:15 PM

 



Post: #5
RE: Magic material promises free cooling. The end of air conditioning ?
This caught the attention of a researcher called Ronggui Yang at the university of Colorado who believed he could make a much cheaper material. By using tiny glass spheres of around 10 microns across, a cheap material, he was able to acheive the same effect of tuning the outgoing radiation to be in the thermal window allowing the heat to be radiated away to space. The main difference is that these glass spheres embedded in a plastic film and backed with metal foil can be made for 50 cents a square metre ( per 10 sq feet ).

http://radi-cool.com/





https://www.youtube.com/watch?v=kb3Z_EbFUvY





https://www.youtube.com/watch?v=TNnYXITzaJw
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LoP Guest
lop guest
User ID: 471784
11-08-2018 06:21 PM

 



Post: #6
RE: Magic material promises free cooling. The end of air conditioning ?
Here is more on the Boulder team's breakthrough.

"Cheap plastic film cools whatever it touches up to 10°C"
https://www.sciencemag.org/news/2017/02/...uches-10-c
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LoP Guest
lop guest
User ID: 472563
11-08-2018 06:23 PM

 



Post: #7
RE: Magic material promises free cooling. The end of air conditioning ?
Felix  Wrote: (11-08-2018 05:56 PM)
So what is this 'magic' material?

chuckle
Liquid nitrogen mixed with rain.
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LoP Guest
lop guest
User ID: 471784
11-08-2018 06:26 PM

 



Post: #8
RE: Magic material promises free cooling. The end of air conditioning ?
A team of researchers at Columbia University have taken the Stamford research and developed a cheap white paint that can be applied in one layer to achieve the same cooling effect.

"Paint achieves seemingly impossible feat of cooling buildings in direct sunlight"
https://www.chemistryworld.com/news/pain...44.article
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singing wilbury spider
krautistan terrarist
User ID: 472564
11-08-2018 06:29 PM

Posts: 6,041



Post: #9
RE: Magic material promises free cooling. The end of air conditioning ?
awesome - when it's hot
but what when it's not?

https://www.youtube.com/watch?v=RpkQEq75y18

[Image: G2FRDqb.gif]

arachnophobes beware!
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LoP Guest
lop guest
User ID: 370703
11-08-2018 06:36 PM

 



Post: #10
RE: Magic material promises free cooling. The end of air conditioning ?
vinylidene fluoride-co-hexafluoropropene.

$52 + shipping for 100g. Doesn't seem very "cheap".
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LoP Guest
lop guest
User ID: 472563
11-08-2018 06:38 PM

 



Post: #11
RE: Magic material promises free cooling. The end of air conditioning ?
LoP Guest  Wrote: (11-08-2018 06:26 PM)
A team of researchers at Columbia University have taken the Stamford research and developed a cheap white paint that can be applied in one layer to achieve the same cooling effect.

"Paint achieves seemingly impossible feat of cooling buildings in direct sunlight"
https://www.chemistryworld.com/news/pain...44.article

chuckle
China paints it's grass green durring a drought. Makes it look nice and plush.
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LoP Guest
lop guest
User ID: 471784
11-08-2018 06:39 PM

 



Post: #12
RE: Magic material promises free cooling. The end of air conditioning ?
singing wilbury spider  Wrote: (11-08-2018 06:29 PM)
awesome - when it's hot
but what when it's not?

The reason I started this thread now was that the boulder team have just completed a year of real world testing with some water filled panels.

https://cleantechnica.com/2018/10/29/pas...eal-world/

You could imagine such panels being mounted on a roof and linked to a thermostatically controlled pump to deliver cooling to the building when it is needed, all much, much cheaper than air conditioning. Each square meter delivers up to 100 watts of cooling at night and 50 watts during the day. The panels could also be linked to the air conditioning system to boost its effectiveness and reduce energy use.

"You could place these panels on the roof of a single family home and satisfy its cooling requirements,” said Dongliang Zhao, lead author of the study and a postdoctoral researcher in CU Boulder’s Department of Mechanical Engineering"
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PopEye
⛔The Sailor Man⛔
User ID: 436592
11-08-2018 06:41 PM

Posts: 3,042



Post: #13
RE: Magic material promises free cooling. The end of air conditioning ?
5*

[Image: hH0nu4G.gif]
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LoP Guest
lop guest
User ID: 430030
11-08-2018 06:48 PM

 



Post: #14
RE: Magic material promises free cooling. The end of air conditioning ?
nano material has shown even better promise and results. CO2 GANS can be created in your own home for pennies, then added to paint. But its pseudo science right, chuckle
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LoP Guest
lop guest
User ID: 471784
11-08-2018 06:52 PM

 



Post: #15
RE: Magic material promises free cooling. The end of air conditioning ?
LoP Guest  Wrote: (11-08-2018 06:36 PM)
vinylidene fluoride-co-hexafluoropropene.

$52 + shipping for 100g. Doesn't seem very "cheap".

I suppose it depends on how thick a paint layer you apply. 150 micron coat would cost $14/m^2, more than the boulder team's 50 cents but I guess you are quoting lab supply prices. It would inevitably be a lot cheaper if mass produced.
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