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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 site map
>and radix point characters vary all over the world.