A rotating solar boiler
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nick pine
Aug 21, 2011, 8:21:14 AM8/21/11
to sunspace, lri...@ursinus.edu
Krischan Makowka <jkmakowka@...> wrote:
> Recently I came across the interesting concept of the rotating solar collector:
> http://www.builditsolar.com/Experimental/RSB/RSB.htm
Very nice, but why the radiation peak at about 13 microns in Fig 2.8
on document page 17? Wien's displacement law says it should be at a
2897.8/373 = 7.8 micron wavelength. The peak of the thermal curve in
Fig 2.1 looks closer, at about 9 microns.
> At first it seems counter-intuitive to make such a unnecessarily complex and energy consuming (although only a little) system, but the more you think about it the more it makes sense (due to relative low construction costs, higher grade heat and maybe most importantly very good isolation).
Then again, the author says: "Placing the solar collector upside down
prevents convection." Putting it over a fixed mirror seems a lot
simpler than rotating it.
> However I also noticed that with a few modifications and simplifications a potentially very cheap solar hot-air heating system could be developed out of this...
I'd vote for Gary's $350 barn heater.
Nick
> Recently I came across the interesting concept of the rotating solar collector:
> http://www.builditsolar.com/Experimental/RSB/RSB.htm
Very nice, but why the radiation peak at about 13 microns in Fig 2.8
on document page 17? Wien's displacement law says it should be at a
2897.8/373 = 7.8 micron wavelength. The peak of the thermal curve in
Fig 2.1 looks closer, at about 9 microns.
> At first it seems counter-intuitive to make such a unnecessarily complex and energy consuming (although only a little) system, but the more you think about it the more it makes sense (due to relative low construction costs, higher grade heat and maybe most importantly very good isolation).
Then again, the author says: "Placing the solar collector upside down
prevents convection." Putting it over a fixed mirror seems a lot
simpler than rotating it.
> However I also noticed that with a few modifications and simplifications a potentially very cheap solar hot-air heating system could be developed out of this...
I'd vote for Gary's $350 barn heater.
Nick
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