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A07 - Solar - hydrogen energy systems for high altitude platforms - current characteristics and limits

Solar -hydrogen systems were analyzed regarding their usability as energy supply system for high altitude platforms. The main attention was directed to characteristics of current or near term available technology. Specific power weight of photovoltaics, electrolyser, fuel cell and gas tanks and their dependence on operation mode and power range were assessed. A pre-design of a solar-hydrogen energy system was carried out for an airship (volume 580,000 m³) withstanding wind speeds up to »130 km/h. The calculated coverage ratio of photovoltaics and load share of energy system mark the frame of usability. Depending on the airship size, shape and other external boundary conditions the total electrical energy demand can be covered by a solar-hydrogen energy system of current or near term technology for full year operation. However there are further investigations necessary regarding minimization of thermal effects on lifting gas through photovoltaic generator.

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