Abstract Solar-hydrogen systems were analyzed regarding their usability as energy supply system for high altitude platforms. In a first step for an assessment of solar and photovoltaic resources near-ground spectral transmittances of atmosphere were extended with simplified height correction functions to achieve spectral irradiance descriptions versus atmospheric height up to 25 km. The influence of atmospheric height to different solar cell technologies regarding electrical performance was quantified at some examples for the aspect of spectral distribution with the help of the introduced spectral height factor. The main attention during analysis of the whole solar-hydrogen energy system was directed to characteristics of current or near term available technology. Specific power weight of photovoltaics, electrolyzer, 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 continous 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 could be covered by a solar-hydrogen energy system of current or near term technology for full year operation. However further investigations are necessary regarding e.g. further mass reductions.
[1]
W. Knaupp.
Power rating of photovoltaic modules from outdoor measurements
,
1991,
The Conference Record of the Twenty-Second IEEE Photovoltaic Specialists Conference - 1991.
[2]
Bo G Leckner,et al.
The spectral distribution of solar radiation at the earth's surface—elements of a model
,
1978
.
[3]
A. T. Young,et al.
Revised optical air mass tables and approximation formula.
,
1989,
Applied optics.
[4]
Anders Ångström,et al.
On the Atmospheric Transmission of Sun Radiation. II
,
1930
.
[5]
R. Bird,et al.
Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres
,
1986
.
[6]
M. Iqbal.
An introduction to solar radiation
,
1983
.
[7]
Leonhard Foitzik,et al.
Sonnenstrahlung und Lufttrübung
,
1958
.