@intrestingfactsanfind: At ETH Zurich, Switzerland, featuring a thermo-responsive hydrogel layer designed to mimic human perspiration. Fact-Check Breakdown • The Technology: Researchers developed a thin (approx. 5 mm) polymer layer made of a hydrogel called PNIPAM (poly-N-isopropylacrylamide). It absorbs and stores rainwater when it is cool, and when the surface heats up past roughly 32°C (90°F) in direct sunlight, the polymer contracts and pushes the water to the surface to evaporate, cooling the structure. • The 60% Cooling Claim: Mostly true as a theoretical estimate, though misleading as a general promise. The 60% energy-saving figure comes from specific computer and model simulations under ideal test conditions, not from widespread real-world trials proving that every commercial or residential building will slash its actual AC bills by that amount. • Current Status: It remains largely an experimental/lab-scale concept rather than a commercially mass-produced roofing product.

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Thursday 05 November 2026 21:31:53 GMT