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Why not imagine it in a way that works?
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There are three kinds of high altitude balloons: Expanding latex balloons, zero pressure balloons and super pressure balloons. The first are large latex balloons that contain the lifting gas and explode at an altitude where the gas expands past the ability of the envelope to contain it. They usually
go up until a preset altitude and then burst. The second are envelopes with open bottoms that can vent lifting gas as the ambient pressure drops to allow them to vent lifting gas as ambient pressure drops. They stay up for longer periods of time but loose lifting gas each day as solar heating causes the gas to expand and vent and then drop in altitude as the remaining gas cools at night. The last are closed inelastic envelopes which are made strong enough to contain the gas as it is heated during the day and can stay aloft for weeks or months.
My idea is to use a PV array to power a pump to pump lifting gas from the balloon into a small tank and then re-release the gas at night. This would allow you to make a cheap zero pressure balloon with the duration of a super pressure balloon.
Google like the idea and of course did it better with steering
[MisterQED, Jun 20 2013]
||Having thought along similar lines, I have to bun. Besides, the poor man version is just a solar powered valve. And it is only a step away from the graduated vacuum balloon I used to think about (while I was under the impression that a vacuum would suck shit into space)
||If the problem with zero pressure balloons is the
daily expansion/contraction cycle, then why not
have a balloon which vents as necessary until it
reaches its ceiling, then closes off the vent and
behaves like an expanding latex balloon (ie,
accommodating the relatively small daily pressure
cycle, rather than venting)?
||All it really needs to work properly is a six-mile high aerogel tower. </not giving in that easily>.
||how did the Zeppelins work?