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2,7m Scheffler Reflector notation issue

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Posted by Curbie on November 19, 2009, 1:09 am
 


I thought after reading the document's title page which is "2.7m2
Scheffler Reflector Solar Cooker", that the 2,7m2 was just a typo, but
after finding some math inconsistencies, all associated with the same
type of #,# reference, I thought maybe the numbers with a comma
notation had some other sort of meaning?
http://www.solare-bruecke.org/Bauanleitungen/Construction_Manual_Family_Size2.7sqm_Scheffler_Reflector.pdf

Does any know what's going on here, a typo (that I should just
interpret as fractional separator) or something else???
    
I think I'm going to have to resolve the inconsistent numbers by first
building the concentrator in Google sketch-up to try an figure out
which of the inconsistent numbers are correct, but first I need to
resolve this comma notation issue.

Thanks,

Curbie


Posted by Curbie on November 19, 2009, 4:38 am
 


Morris,

Haven't seen that notation used before, I guess it's just a
coincidence that the inconsistencies are associated with numbers that
include a fraction?

I think I should be able to figure out which numbers are correct with
sketch-up by what fits and what doesn't, than I'm hoping to reverse
the parabola diameter, depth, and aperture area from the exact focal
length, and hopefully get a better mathematical handle on the nature
of scheffler's parabolic warping for the sun's seasonal inclination
angle compensation.

I wonder if there are any applications for a 12 -16 sqm fluidyne,
you're currently at 3sqm, correct? Or any value to the notion of a
multi-purpose concentrator, by changing the device at the focal point
as needed, it also occurred to me that combining a fluidyne with the
air-lift concept may considerable increase your design's operational
pumping depth, if required.

Thanks for your time and explanation.

Curbie


Posted by Curbie on November 19, 2009, 10:14 am
 

Morris,


Thanks.


I share you guess, but that's the math question I'm trying to answer,
how much optical error is there and are there correction
possibilities?


Scheffer is where I got that clockwork tracker I sent you, I also find
the fixed collector mount, fixed focal area, and high temps appealing,
but as long as you have something better suited for your application,
life is good.


You're welcome to my air-lift design research, only about .75Mb. and
not complate.

Curbie


Posted by EHWollmann on November 19, 2009, 5:05 am
 

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