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The protected surface is coated with a fluid acting as a Freezing Point Depressant

The protected surface is coated with a fluid acting as a Freezing Point Depressant (FPD). When the supercooled water droplets impinge the surface, they mix with the protecting fluid coat. The resulting mixture has a freezing point lower than the recovery temperature of the ambient air. The mixture slides aft and then its evaporates or sheds from the trailing edge. \\

Nonetheless, the use of this technique has two limitations. The use of the protection fluid as glycols present some environmental issues as well as it is required to carry and stock the fluid and the A/C can eventually run out of it.\

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