Interesting novel idea for solar updraft tower proposed by Per Lindstrand's (bloke who ballooned across the pacific with Sir Richard Branson). His idea is using balloon technology for the chimney.
see below link
http://spectrum.ieee.org/energywise/energy/renewables/will-balloons-boost-the-solar-updraft-tower-idea
Interesting novel idea for solar updraft tower proposed by Per...
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