Cooling aint free..but almost...

It would be nice to buy some sheets already coated. However, the process seems so long and complicated, I don't believe they will be on the market soon. However, maybe AI can make the process simpler and more economical. Hey hey.

I do not see any reason why coated sheeting could not be mass produced.The powder is readily available and reasonably cheap,theoretically,IMHO, the substrate could be as simple as the aluminum coating on a CD with the top layer applied in the same manner as a CD.The multi-coat requirement could be resolved with the proper solvent and application technique.Perhaps a UV hardening coating,such as used in furniture manufacturing could be used.The finish is applied and passed under a UV source,and it is dry in a second or less.The manufacturing cost of the material should be very low,and the profit margin very high.

The nano powder can be either Barium Sulfate or Calcium Carbonate.

Possibly using ultrasound in the solution to generate the various sizes should be simple also:Adjust power and timing of the ultrasound for different sizes required.

(Maybe they have not thought of this or it does not work, I am just speculating here.)

This could actually be a world changing invention,especially in 3rd world countries where electricity is not readily available.And of course,the military uses are virtually limitless; solar farms,tents,buildings, clothing,etc.

I hope this technology is available soon,but I do not expect it to be cheap for a long time,at least 20 years for the patents to expire.

It looks like you've got it worked out pretty good. Someone may take your comments and develop the product! However, I wonder how much good it would be in a metal building on a 90 degree day when it only lowers the temperature of the underside of the metal by 4 or 5 degrees C? By the time you get down to floor level, you are not going to feel much relief. Money spent digging trenches or holes for a geothermal unit would probably be more cost effective.

True,it may not be suitable for all situations,but consider a consumer or military tent in a very hot climate where there is no shade,or areas in 3rd world countries where electricity is not available or is very expensive.Direct sunlight is not required,only humidity in the air. It could also work inside of a building,ceilings,walls etc.Of course there would be many IR reflective things to reduce the efficiency.

Imagine highways,parking lots, flat roof buildings with the coating.Of course sunglasses would be required to prevent going snow blind on the highway in daytime.

There's one drawback. Like with solar panels, clouds are a big problem. Cloud bases are a lot warmer than the cold, clear sky.

The sky is really cold!

Most air conditioning just pumps heat from inside of a building to the outside and adding even more heat from the work being done.

Beaming the heat to the cold sky removes the heat from the lower atmosphere. The crux is whether the process can be scaled up to be practical.

I think that, by itself, it may not cool a building, but it can be piggy-backed on conventional air conditioning to save energy.

https://www.skycoolsystems.com/

Depending on time of day,season,and latitude,the difference in temperature between direct sunlight and shade can be as much as 20Deg F.

The difference in temperature can also vary depending on the type of shade:Example:under a tree will be much cooler due to the evaporation from the tree,in comparison for other type shade.

This cooling method takes advantage of providing shade to the underlying surface and emitting heat into space.A metal roof totally covered in this paint or material will be much cooler even without the cooling technology.

Buildings emit a lot of horizontal infrared,so reflectors might be employed to direct this onto a cold-sky-facing emitter,thus lowering the overall air temperature in the area.

How about a reservoir covered in this film,or floating balls covered in this film?

Windows could also be designed to focus energy on to a boiler,but safety must be engineered into the system to prevent damage to other structures or people or animals.

I saw smoke coming from my vehicle interior when returning to my vehicle from shopping,and discovered that a SUV window was focusing sunlight through my curved back window onto the inside rear passenger handle and had melted the armrest.The combination of curved windows made a perfect focal point onto my interior arm rest.A few minutes earlier or later it would not have happened as the sun moved westward.Just wrong place,wrong time,wrong parking space.It happens.

A rare occurrence indeed,but it made me realize the power of concentrated sunlight,even on a small scale.

All these windows on skyscrapers going to waste,what a shame.

I am just brain storming here,without research to support my ideas,just thinkin'

All these windows on skyscrapers going to waste, what a shame.

It's already been invented, albeit, inadvertently.

https://www.nbcnews.com/sciencemain/london-skyscraper-can-melt-cars-set-buildings-fire-8c11069092

I was aware of that incident,but the energy was wasted instead of being put to use.

That is where I got the idea to deliberately focus to a point for conversion to electricity or other uses, such as Steam.Most big cites have large boilers and distribution systems for this purpose.At the very least,it could supplement the current heat sources for this purpose.

I know they cannot rebuild all of the buildings,but curved windows would accomplish the same thing when designed for this purpose.

Curved windows is a good idea for heating the skyscraper in the winter. But what about the summer? Would the AC have to overcome that heat? Would covers block the heat and view?

Not talking about heating the building,talking about focusing to a target point to generate steam.

You have to be careful with condensation forming ....

https://www.freedommetal.com/freedom-metals-blog/condensation-under-a-metal-roof

..."The most common radiative coolers found on buildings are white cool-roof paint coatings, which have solar reflectances of up to 0.94, and thermal emittances of up to 0.96.^[18] The solar reflectance of the paints arises from optical scattering by the dielectric pigments embedded in the polymer paint resin, while the thermal emittance arises from the polymer resin. However, because typical white pigments like titanium dioxide and zinc oxide absorb ultraviolet radiation, the solar reflectances of paints based on such pigments do not exceed 0.95.

In 2014, researchers developed the first daytime radiative cooler using a multi-layer thermal photonic structure that selectively emits long wavelength infrared radiation into space, and can achieve 5 °C sub-ambient cooling under direct sunlight.^[19] Later researchers developed paintable porous polymer coatings, whose pores scatter sunlight to give solar reflectance of 0.96-0.99 and thermal emittance of 0.97.^[20] In experiments under direct sunlight, the coatings achieve 6 °C sub-ambient temperatures and cooling powers of 96 W/m²."...

https://en.wikipedia.org/wiki/Radiative_cooling#:~:text=Radiative%20cooling%20has%20been%20applied,made%20daytime%20radiative%20cooling%20possible.

https://www.science.org/doi/10.1126/science.aat9513

It will work as claimed. The thickness of the coating will require some innovation in manufacturing methods.

The wavelength-selective emissivity is central to it, and has been used successfully in other applications for many decades. I am in favor of passive techniques for heating or cooling, compared to active techniques because of their independence and lower energy consumption.

A big problem is the existence of our built environment and the application or adaptation of these materials and methods to this environment (including our physical, social and financial sides of the environment).

--JMM