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Thank you

*Promosm*

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! ❤

Sorry all we developed a coating more efficient than this in Australia over 30 years ago .

But PLA degrade only in industrial composting, not in nature or home composting. Therefore, if it is not sorted and collected separately as a compost and leaks into nature it takes not thousands but hundreds of years to degrade, and it does the same damage as a microplastic during this timeframe.

You still need to test whether it is degradable in natural environment

All this scientific research and the hard work of these fungi, only to end up as plastic spaghetti on yet another failed Benchy print.

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

First, virtually nothing is said about the yield and the cost of the final product. Second, PLA is NOT, I repeat, PLA IS NOT NATURALLY BIODEGRADABLE within realistic timeframes and REQUIRES industrial composters in order to be degraded.

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.

The Planetary Air Conditioner provides up to 25 degrees C of cooling. Why are you bragging about 4 to 7 degrees?

Engineering firms could also use this. Plastic prototypes and small scale concept models can be 3d printed, for which, PLA extruded into a 1.75mm filament is a common material.

Cool

How to buy ?

but why ?

are the three differnt process of making it differnt ways of differnt parts in one large process???

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!!

PLA in name itself a acid how it doesn't effect food in packaging

It is not true that is degradable in the natural environment, it requires special composting facilities, specific temperatures, humidity and specific microorganisms not available in regular conditions.

This is fantastic but might not be durable enough for clothing? PLA deforms in hot water. The clothing would definitely be cold-water-wash only and air dry. Not sure how well PLA textiles hold up in use vs conventional plastics. Worth experimenting! This study confirms my suspicion, clothes dryer is the big problem: www.researchgate.net/publication/299999395_Care_of_PLA_Textiles

at last it converts into CO2 and the main moto should be towards to reduce the carbon footprint not to increase it... is there any possible way to utilize this produced CO2

Very interesting, i subscribed

Yield is very low

How expensive may be to produce this product

very good technology. how i can get its. let me know details about business facility. email me details in rashedul.company@gmail.com

does it mean that if i go to city u i can have free spools of filament?

Interesting. Makes you wonder just who the hell thinks this stuff up and what was the train of thought that got them there.

Seeing how there is now a huge demand for PLA filaments for 90% of desktop 3d Printers, added with the many uses that bio plastics such as PLA provides, this project should be a world wide, and funded globally by first world nations. Such as United kingdom , United States, Canada, China, Australia ........