Solar Flux


by RKD89
Tags: flux, solar
RKD89
RKD89 is offline
#1
Aug19-10, 05:36 AM
P: 45
Hi Guys
I m trying to make a Stirling engine power by solar heat.
Somewhere I found out that the solar flux available on earth is abt 1350watts/m2

Is this heat energy only or "heat & light " combined??


I m trying to find out if my soar engine will be better than traditional solar cells??

What is the energy conversion rate for solar panels/m2???
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AJ Bentley
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#2
Aug19-10, 06:43 AM
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A Stirling engine is one of the most efficient heat engines known. It is doubtful if a solar panel (notoriously inefficient) would be anywhere near as good at converting heat directly into mechanical movement.

On the other hand, if you intend to run (say) an electric generator from your engine, forget it. The power developed by a model Stirling is amazingly low - it can barely keep itself running against friction.

Here's a vid of my own Stirling.

http://www.youtube.com/watch?v=GtTz4X7Mi64
Astronuc
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#3
Aug19-10, 06:54 AM
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Quote Quote by RKD89 View Post
Hi Guys
I m trying to make a Stirling engine power by solar heat.
Somewhere I found out that the solar flux available on earth is abt 1350watts/m2

Is this heat energy only or "heat & light " combined??


I m trying to find out if my soar engine will be better than traditional solar cells??

What is the energy conversion rate for solar panels/m2???
The 1.35 kW/m2 refers to the light and would produce that thermal power if it could be converted to heat at 100% efficiency.

One could use 10% as a reasonable estimate of the efficiency of PVs.
http://www.examiner.com/green-techno...cost-materials

World's Highest Photovoltaic Energy Conversion Efficiency Among Monolithically Integrated Flexible Solar Cells = 15.9 %
http://www.azonano.com/news.asp?newsID=16822

There are apparently more efficient PV cells in the works.
http://www.technologyreview.com/Energy/18910/


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