This looks amazing. The difference of 15 degree C is a huge difference. If this is so useful why Countries are not using this technology by making it mandatory to all Paint manufacturing companies to use this technology in making Paints. This will have a huge impact in tackling climate change.
Here's my solution to global warming. At the same time, the creation of an ultra alternative energy source. We take a titanium paint, paint one part of the thermoelectric converter, and paint the second part in Barium Sulfate. We place this case on the vast expanses of our deserts of the Sahara, etc. Madness!!
I suggest Stirling Engine as thermoelectric converter as it reached 41% efficiency! (as compared to the expensive solar panels which only get up to 23%)
Passive daytime radiative cooling is a promisng phenomenon recently proposed for abating urban overheating and reducing the consequent termal comfort deterioration in the building enviroment by combining density function al theory, many-body perturbation theory and the finite difference method we investigated phonon bande structure electronic bandgap optical features and carrier effective masses aiming to predict the expected performance of the proposed compounds! ❤
In order to achieve cooling below the ambient air temperature using passive radiative cooling during daytime/direct sunlight why is it important to radiate the heat into the upper atmosphere/space, instead of the surrounding air, like an Air conditioners? I know an airconditioner does not transfer/dump heat to the outside by radiation, but by phase transformation-specifically condensation..but AC's do dump heat into their immediate environment. not up to space/upper atmosphere This question is in regards to Sky cool systems which makes meta material film to be used on rooftops of buildings to cool the building directly- or to cool water pipes. The film is made out of meta materials that in addition to reflecting away all sunlight incident on it, also radiates away all infrared in the 8-13 micrometer range. These mid infra red wave lengths are not "trapped" by greenhouse gases in the lower atmosphere so radiate straight into upper atmosphere or space. Is it because if the material was radiating merely into the surrounding air (instead of radiating out to space) -part of that radiation is just returned back to the surface radiating it after being absorbed and reemitted by the gases in the surrounding air? Thus the requisite cooling cannot happen in day time/direct sunlight? So this is sort of like an inverse greenhouse gas effect? Or is it because passive radiative cooling cannot transfer heat from the inside (colder) to the outside (sunny and warm) air unless the passive radiative heating specifically emits within a certain band of wavelength. For transferring heat from cold to warm one needsto work against entropy. Air conditioners/heat pumps overcome entropy by using electric power to compress vapors. By using meta materials Sky cool is essentially a creating a heat channel to space... Also how is this approach of using metamaterials which radiate away in the specific wavelength bands-that are not absorbed by GHGs, different from using infrared reflective paint (which I presume radiates away at all wavelengths of the infrared)? Are my questions clear? Please help, could you ask your engineering friends familiar in material science and engineering and thermodynamics or someone in physics th-cam.com/video/CMaZfuInd9c/w-d-xo.html
Thank you
This looks amazing. The difference of 15 degree C is a huge difference. If this is so useful why Countries are not using this technology by making it mandatory to all Paint manufacturing companies to use this technology in making Paints. This will have a huge impact in tackling climate change.
Here's my solution to global warming.
At the same time, the creation of an ultra alternative energy source.
We take a titanium paint, paint one part of the thermoelectric converter, and paint the second part in Barium Sulfate.
We place this case on the vast expanses of our deserts of the Sahara, etc.
Madness!!
I suggest Stirling Engine as thermoelectric converter as it reached 41% efficiency! (as compared to the expensive solar panels which only get up to 23%)
@@DreamingConcepts I agree with you about efficiency. But fewer moving parts wins. It's more stable and easier to maintain.
Passive daytime radiative cooling is a promisng phenomenon recently proposed for abating urban overheating and reducing the consequent termal comfort deterioration in the building enviroment by combining density function al theory, many-body perturbation theory and the finite difference method we investigated phonon bande structure electronic bandgap optical features and carrier effective masses aiming to predict the expected performance of the proposed compounds! ❤
In order to achieve cooling below the ambient air temperature using passive radiative cooling during daytime/direct sunlight why is it important to radiate the heat into the upper atmosphere/space, instead of the surrounding air, like an Air conditioners?
I know an airconditioner does not transfer/dump heat to the outside by radiation, but by phase transformation-specifically condensation..but AC's do dump heat into their immediate environment. not up to space/upper atmosphere
This question is in regards to Sky cool systems which makes meta material film to be used on rooftops of buildings to cool the building directly- or to cool water pipes. The film is made out of meta materials that in addition to reflecting away all sunlight incident on it, also radiates away all infrared in the 8-13 micrometer range. These mid infra red wave lengths are not "trapped" by greenhouse gases in the lower atmosphere so radiate straight into upper atmosphere or space.
Is it because if the material was radiating merely into the surrounding air (instead of radiating out to space) -part of that radiation is just returned back to the surface radiating it after being absorbed and reemitted by the gases in the surrounding air? Thus the requisite cooling cannot happen in day time/direct sunlight? So this is sort of like an inverse greenhouse gas effect? Or is it because passive radiative cooling cannot transfer heat from the inside (colder) to the outside (sunny and warm) air unless the passive radiative heating specifically emits within a certain band of wavelength. For transferring heat from cold to warm one needsto work against entropy. Air conditioners/heat pumps overcome entropy by using electric power to compress vapors. By using meta materials Sky cool is essentially a creating a heat channel to space... Also how is this approach of using metamaterials which radiate away in the specific wavelength bands-that are not absorbed by GHGs, different from using infrared reflective paint (which I presume radiates away at all wavelengths of the infrared)? Are my questions clear? Please help, could you ask your engineering friends familiar in material science and engineering and thermodynamics or someone in physics
th-cam.com/video/CMaZfuInd9c/w-d-xo.html
Cool
How to buy ?
Paint the roof with reflective white colour.
They have the same thing in greece. Quite advanced tbh
Sorry all we developed a coating more efficient than this in Australia over 30 years ago .
so where can you purchase this? What is it called?
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The Planetary Air Conditioner provides up to 25 degrees C of cooling. Why are you bragging about 4 to 7 degrees?
2:05
25 C is 77 F
40 C is 104 F