"The envelope of a balloon is tethered via a windlass to a motor/generator, Fig 4. The balloon is charged with hot air obtained by drawing ambient air through a glazed solar collector that encloses black pipes filled with water. When fully charged the balloon is allowed to ascend with the buoyancy force doing work on the generator. At some predetermined height a large fraction, typically 80%, of the remaining air is vented, the buoyancy is reduced and the balloon is hauled back to ground level by the operating the motor/generator as a motor. The system delivers, via the motor/generator, an electrical power output to a storage battery or to the electrical grid."
http://www.solartran.com.au/balloon_engine.htm
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