EmperorArthur t1_iv8rfne wrote
Reply to comment by HardCounter 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
What it's doing is stopping IR from going through the window and heating the room. The outside of the window instead absorbs it all and gets hot.
The reason that doesn't transfer all inside is first because can dissipate part of the heat on the outside surface. Second, the glass on the outside is separated from the glass on the inside. Which provides insulation.
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