Feel free to share the article, but I'm dubious of the 40% claim. It might attain 40% of theoretical (Carnot) efficiency - which would be pretty good, for a thermoelectric device. But the basic efficiency is going to be a function of the magnitude of the temperature difference, and that's...
No, this is not possible, for basic thermodynamics. All power extraction requires a hot side and a cold side. Even thermoelectric coolers/generators (i.e. Peltier junctions) have to have a "sink" for heat. Without a sink, there is no gradient, so there is no flow, so there is no energy to be...
This thread - thread403-416011 - discussed how much of the fan's energy input became heat in the air stream. There was wide-ranging discussion but no clear conclusion was reached.
Having had to research and resolve this issue for my current project, I decided to share the conclusions here for...
