Solar Collection/Fresnel lenses

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2 total messages Started by Richard Christensen Wed, 08 Apr 1992 13:54

#39

Author: Richard Christensen
Date: Wed, 08 Apr 1992 13:54

26 lines
1743 bytes

I want to do some experiments with solar collection.  The specs of
Edmund Scientific's fresnel lenses are surface area, focal length,
and lines per inch.  How does one figure which lens would
give the highest power density (W/m^2)  (hottest spot).  I used
this formula Area / (Pi (f A)^2).  This gives a relative power density
into a lens with the power desity of the focused image.
Does this make sense?
Edmund Scientific told me that the only thing that mattered was
the number of lines per inch.  The lower the better (counter-intuitive
isn't it).  Given that the lines per inch are equal, the power
densities will be equal.  I have a hard time believing this?

Any help would be appreciated.

--
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| Richard B. Christensen                              |
| richard.ee.byu.edu                                  |
| Brigham Young University 459 CB Provo, Utah 84602   |
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--
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| Richard B. Christensen                              |
| richard.ee.byu.edu                                  |
| Brigham Young University 459 CB Provo, Utah 84602   |

Re: Solar Collection/Fresnel lenses

#44

Author: John Schuch
Date: Mon, 13 Apr 1992 19:00

11 lines
898 bytes

In article <1992Apr8.195550.7020@hamblin.math.byu.edu> richard@ee.byu.edu (Richard Christensen) writes:
>[stuff deleted]
>Edmund Scientific told me that the only thing that mattered was
>the number of lines per inch.  The lower the better (counter-intuitive
>isn't it).  

Not really if you consider the optimum would be a large regular lens
of the same diameter, that would have 0 lines. ( or 1 depending on
how you look at it )

John

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