Also there is a fan for stove which works without any electric sources. It just works when the stove get hot. The Vulcan Stove fan goes fast when the temperature gets higher.
How It works?
It utilizes a small, quiet Stirling cycle power plant built into the fan.The Stirling cycle power plant obtains its power from rapidly heating and cooling the same volume of air. When the air is heated, it expands, pushing a piston upward; when the same volume of air is rapidly cooled, it contracts, pulling the same piston downward, providing power. The same volume of air is heated and cooled at a very rapidly converting the heat energy to mechanical energy used to turn the fan blade.
Of course it could be used also as an electricity producer. Circulation of fan can produce electricity. But I don’t know how much size it has and if it is possible to apply such an electric source in industrial environments for each sensor node. The product’s size is about 30X30 cm.
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