Horace
Unfortunately the energy you can get from gas buoyancy is way less than the heat energy to get that buoyancy. Solar towers, for example, run at less than 2% efficiency.
Yes but that is due to low Delta-T no? ... the $64 question - is there an advantage to the addition of charge? IOW the solar tower is a heat engine and the 'Carnot spread' is small so the efficiency is smaller yet. I am wondering if the addition of charge - and perhaps unbalanced charge would change those dynamics.
