Mark Walker: Model Based Systems Engineering Initial Stages for Power & Energy
Initial System Design Presentation I Power systems.
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Transcript of Initial System Design Presentation I Power systems.
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Initial System Design Presentation I
Power systems
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Presentation topics
Solar energy How solar cells work Different types of solar cells available
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Solar Energy
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Solar Constant : Integrated energy under the Air mass Zero ( outside the Earth’s atmosphere ) curve.
Accepted value till 1990s = 135.3 mW/cm^2
Recent measurements shows it is 136.6 mW/cm^2
The difference in Earth-sun distance between perihelion and aphelion results in solar constant variation of +- 3.5% of 136.6 mW/cm^2
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When a solar cell gets illuminated , electron – hole pairs are produced throughout the base region below the junction to a depth that is dependent on light’s wavelength.
Longer wavelengths have more penetrating power.
Back Surface field ( BSF) layer is introduced to reflect back minority carriers that are diffusing away from the junction.
Back Surface Reflector (BSR) layer is there to reflect protons.
BSFR cells are better.
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Multijunction cells
Such cells have reached efficiencies of around 35% under concentrated sunlight.
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The first spacecraft to use solar panels was the Vanguard 1 satellite, launched by the US in 1958. This was largely because of the influence of Dr.Hans Ziegler, who can be regarded as the father of spacecraft solar power.
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http://s1.zetaboards.com/UTD_Cube_Satellite