Mirrors for building cooling

So these mirrors transform light into IR heat and then shoot them right out of the atmosphere.  They say that they wouldn’t impact climate change, but if there were enough of them, I would think they would have to.  Even if not directly, by sending heat out, then indirectly, by eliminating energy use (presumably carbon based energy).

From the Guardian:

A mirror that sends heat into the frigid expanse of space has been designed by scientists to replace air-conditioning units that keep buildings cool on Earth.

Researchers believe the mirror could slash the amount of energy used to control air temperatures in business premises and shopping centres by doing away with power-hungry cooling systems.

Around 15% of the energy used by buildings in the US goes on air conditioning, but the researchers’ calculations suggest that in some cases, the mirror could completely offset the need for extra cooling.

In a rooftop comparison of the device in Stanford, California, scientists found that while a surface painted black reached 60C more than ambient temperature in sunlight, and bare aluminium reached 40C more, the mirror was up to 5C cooler than the surrounding air temperature.

“If you cover significant parts of the roof with this mirror, you can see how much power it can save. You can significantly offset the electricity used for air conditioning,” said Shanhui Fan, an expert in photonics at Stanford University who led the development of the mirror. “In some situations the computations say you can completely offset the air conditioning.”

Can they add a PV cell layer, to generate electricity as well?  Will this cause any issues for things above these mirrors, like airplanes, or airplane pilots, or electrical signals in the area, or satellites?  Pretty cool, though.



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