The Sun's Energy and Sunshape

1
The Sun's Energy and Sunshape
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Helios Solaris DLR Institute of Technical
Thermodynamics, Stuttgart
The sun, our singular source of renewable energy,
sits at the center of the solar system and emits
energy as electromagnetic radiation at an
extremely large and relatively constant rate, 24
hours per day, 365 days of the year. Considering
the energy coming from the direction of the sun,
two factors must be considered when using highly
concentrating collectors

• there is an intensity variation across the disc
  of the sun (limb darkening)
• the apparent radiation coming from just a few
  degrees away from the suns disc (circumsolar
  radiation) may have a significant energy content.

Figure Radiance distribution of a "standard"
solar scan showing both solar disc and
circumsolar radiation (Bendt and Rabl, SERI
Report, 1980).
Notes for the design of your poster The posters
should serve as a basis for discussion and are an
addition to your presentations. The main focus of
the posters should be on your results. Therefore
the posters should include clear descriptions of
your results (e.g. graphs, tables) as well as
descriptions of important working tools e.g.
schemes of experimental set-up, flow charts.