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Should our desert communities make water from air?   The Consumer You: Marketplace

Started Jun-30 by Showtalk; 9214 views.
Showtalk said:

I also don’t want them on the roof.

I've been watching them go onto roofs everywhere around here.

There is a trick to reduce the waste heat, that is still being tweaked for performance. One is a selective wavelength reflective / transmissive paint. It passes only the actual wavelengths of light that solar cells convert to electricity. It strongly reflects the rest.

Another is a new type of "layered" multi technology photovoltaic system. These use transparent solar cells that operate at different wavelengths than silicon cells, and extract power that silicon can't convert very well.

What is left passes through to the silicon layer. Some experiments suggest that almost 40% efficiency is theoretically possible.

Combined with something to reflect the unusable wavelengths much as leaves do (they absorb specific parts of red and blue light and strongly reflect the unneeded green and infrared), we could significantly reduce temperatures beneath photovoltaic panels and increase the overall albedo of those parts of the planet.

The most effective materials to do highly selective color reflectivity vs transmissivity are not pigments at all, but are nanoscale structures which behave at visible / infrared wavelengths very much like how tuned resonant cavities work for repeater transcievers and extremely selective radio frequency filters.

Some of these materials whose physical structure acts like a highly selective light filter could achieve unheard of efficiency.

Then there is the two-photon and other ratio excitation to emission classes of materials, which also involve phenomena much like frequency doublers and triplers used in RF electronics but at optical wavelengths.

So I think solar panels are about to get much, much more efficient in the near future. Of course with all the NIMBY phenomena here and regulatory hamstringing, we'll probably have to just buy them from our Chinese overlords.

speaking of NIMBY hamstringing our own infrastructure maintenance and costing us trillions,

https://www.vox.com/22534714/rail-roads-infrastructure-costs-america

The level of dysfunction is going to destroy the nation.

Showtalk
Host

From: Showtalk 

Jul-7

It would destroy the existing roof.  It happened to neighbors. You can see patches all over it now.

Showtalk
Host

From: Showtalk 

Jul-7

But isn’t the point of using wind turbines to save the environment?  Aren't those dead birds part of the environment ecosystem?

Showtalk
Host

From: Showtalk 

Jul-7

I will wait for the more efficient models.  Thank you for the excuse.

WALTER784

From: WALTER784 

Jul-8

Showtalk said...

It would destroy the existing roof.  It happened to neighbors. You can see patches all over it now.

I guess it depends on the construction of the roof and the contractors who mount it on the roof.

Why would patches be required? The ones I have installed on my roof have rails bolted to the roof and panels mounted to the rails.

So if I were to remove the panels, the rails will still be remaining. And if I unbolt the rails and remove them, all I have to do is screw the bolts back in and no patchwork required what so ever.

FWIW

Showtalk
Host

From: Showtalk 

Jul-8

They damaged the existing roof when they installed it. Rather than reroof, they patched it. The old roofing materials changed color from the sun.  It doesn’t matter if the pitch of the roof is such that you can’t see it from the street, but if you can, it looks bad.

Showtalk said:

But isn’t the point of using wind turbines to save the environment? Aren't those dead birds part of the environment ecosystem?

Of course.

The problem from a pure environmental ecosystem standpoint is, the existence of civilization with 7 billion on the planet, is going to have quite a footprint.

Now once "they" kill off the numbers to a manageable population density, then we can get back into some kind of balance with nature, into a sort of equilibrium and harmonious part of the natural world.

of course that sounds like a bunch of new age mumbo jumbo from one angle, and a basic lesson in thermodynamics from another.

WALTER784

From: WALTER784 

Jul-8

Showtalk said...

They damaged the existing roof when they installed it. Rather than reroof, they patched it. The old roofing materials changed color from the sun.  It doesn’t matter if the pitch of the roof is such that you can’t see it from the street, but if you can, it looks bad.

Sounds like bad construction crews if you ask me.

That's why I went with the solar panels that the company who built my house recommended as most compatible with my roof and they used regular construction crews who build homes like mine for a living. They know the roofs and how to install it properly.

I installed them in 2015 and they've already well over paid for themselves and continue to provide me with a good steady income of $120~$180 or more per month.

FWIW

WALTER784

From: WALTER784 

Jul-8

$1,661.87 in cats (ROCKETMAN_S) said...

The problem from a pure environmental ecosystem standpoint is, the existence of civilization with 7 billion on the planet, is going to have quite a footprint.

Now once "they" kill off the numbers to a manageable population density, then we can get back into some kind of balance with nature, into a sort of equilibrium and harmonious part of the natural world.

And so they usher in vaccinations to help dense out the population? It sounds scarier than just conspiracy theory.

China already has 1.4 Billion people and they're finding it hard to get enough foodstuff to feed all of them without importing heavily. If that number were drastically reduced, it would be much easier on their country.

There is some kind of stone (what ever you call it) in Georgia that has writing on it about a world populace should not be more than (however many people) inscribed on it.

FWIW

Showtalk said:

I will wait for the more efficient models. Thank you for the excuse.

well, if one waits long enough, they'll never get it done. We have likely gotten to the point where the solar panels on houses are moving the needle as far as economic break-even and even economic gain.

I've put up some solar panels, with plans to eventually upgrade them gradually as efficiencies continue to rise. So while the panels going up today put out about 50 watts per square meter, which is about 5% efficient (sunlight striking the earth packs about a kilowatt per square meter), by the time I get, say, 20 square meters of panels up, there will be panels that can deliver 100 watts per square meter.

Then eventually, 150 watt per square meter panels become available. Swap out a row of 50 watt per square meter with 150 watt, and re-use the less efficient ones for separate projects such as remote electronics, while the more efficient units do the heavy lifting to run the air conditioner on a very hot day.

Even at 7% efficiency, a canopy of solar panels above the roof with good air circulation can be a game changer n the battle against desert blast furnace heat.

It is also possible to actively cool solar panels.

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