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Re:New ‘mirror’ fabric can cool wearers by nearly 5°C by StrictDabbler on Friday July 09, 2021 @10:42AM (#27784163)
This is why we have wet and dry bulb temperatures.

Your intuition about temperature is focused on the dry-bulb temperature that a simple probe gives you.

A wet-bulb is literally a probe with a wet cloth or tissue around it.

As the humidity in the air increases the wet-bulb temperature approaches the dry bulb temperature.

This is absolutely “warming”. The latent heat of the air increases. The sensible heat remains the same.

Re:New ‘mirror’ fabric can cool wearers by nearly 5°C by Retric on Friday July 09, 2021 @11:16AM (#27784534)
Without the jacket the person will emit the same heat. The jacket fans do generate a trivial amount of heat, but it’s likely less than a desktop fan.