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dryguy t1_iv6dlmx wrote

Reply to comment by ageispolispura in Researchers designed a transparent window coating that could lower the temperature inside buildings, without expending a single watt of energy. This cooler may lead to an annual energy saving of up to 86.3 MJ/m² or 24 kWh/m² in hot climates by mossadnik

| Wouldn't it make outdoor temps higher?

To the degree that there would be less heating of indoor air, there might be a bit more heating of outdoor air near the window from the UV and IR the window reflects, but the volume of outside air is so tremendously very much larger than the air in a room, it would be very hard to notice. The amount of heat dumped outdoors by an air conditioning unit would be a lot higher in comparison.

To the extent that it reduces the use of air conditioning, it would result in less energy consumption, hence less greenhouse gas emission. So you could argue that it helps keep outdoor temps lower.

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ageispolispura t1_iv6efhw wrote

Thanks for the reply! appreciate it :) I understand the enthalpy exchange for AC units but wasn't sure if this was actually reflecting 'back to space' like it claimed or just reflecting it back outdoors. Even if it does just reflect back outdoors, what you explained makes a lot of sense.

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ten-million t1_iv7bysi wrote

Are you kidding? All the low-e glass in windows now has multi layered coatings. They are code required now. Every new window has coatings. I spec out cardinal 366 low-e glass all the time. All the window manufacturers use just a few glass suppliers.

And these coatings save money and save energy. That’s why they use them.

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