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Spray water in front of a fan. Way faster than forcing heat exchange through air to metal.
The reason it works on Winter is that the temperature difference is about 50C or more. On a hot 35C day it would mean the radiator is at most at -15C… And that’s why you’ll prefer to stand in front of the fridge that has 6C than a radiator that may run at best 15C water inside.
Also can we count the bots separately by country of origin? 🤣