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,

*>http://en.wikipedia.org/wiki/Decimal_separator says that digit separator *

*>and radix point characters vary all over the world.*

Thanks.

*>My guess is that Schiffler's distortion of a flat plate yields only an *

*>approximate parabola, but that's probably sufficient for the large *

*>aperture used.*

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?

*>Probably not in my development context. I'm trying to avoid needing a *

*>human operator/attendant - and the entire effort is targeted toward *

*>places where there's no expertise to maintain / repair electrical systems.*

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.

*>I've been thinking about that. All it takes for the fluidyne to pump air *

*>is check valves that seal air-tight. I've promised myself to explore the *

*>air-lift approach for deep well use - but first I'd like to arrive at a *

*>good shallow well design.*

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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