Future of energies

Renewable energies except solar electric or thermal (seeforums dedicated below): wind turbines, energy from the sea, hydraulic and hydroelectricity, biomass, biogas, deep geothermal energy ...
Alex
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Registration: 16/03/05, 11:37




by Alex » 23/04/07, 11:36

Polo wrote: A superimposition of layers of gallium-indium-phosphorus, gallium arsenide and germanium enlarges the spectrum of light converted into electricity. Why use these materials?


The materials are chosen according to their prohibited bandwidth.
On multi-junction cells, the top cell converts the most energetic photons, so we choose a semiconductor material with a high gap (ex AlGaInP) and the bottom cell converts the least energetic radiation corresponding, for example to near IR (GaInNAs for example).
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Polo
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by Polo » 25/04/07, 13:31

Exelent thank you very much, I knew I could count on you;)
For the graph, it was precisely to see this evolution that I wanted it. I'm talking about techniques to limit / cancel the impact of this price increase. I thought it was weird not to find it on the internet!
Thank you very much...
For the up / down conversion no other info?
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Woodcutter
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by Woodcutter » 25/05/07, 23:49

aidiv wrote:Hello, I saw a show called New Explorers which showed hydrogen wind turbines in Norway.

the principle is simple when the electric production exceeds the demand, the surplus is stored in the form of hydrogen and consumed in generator sets from 19 hours, during the peak of consumption (it is on an island)

Below is a link I found on google

http://www.norvege-fr.com/actus/actuali ... php?id=400
Excellent!

Well, the electrolysis efficiency of water => hydrogen => heat engine => electric generator should not be phenomenal, but it's better than losing energy when you don't need it ...

On the other hand, I think that it is not tranposable to large units of introductions.
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