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Solar design Challenge - off-grid workshop - Page 6

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Posted by Morris Dovey on November 13, 2009, 5:25 pm
schooner wrote:

Depends - do you want to acquire knowledge or practice Marxism? :)

The installation web page originally included detailed step-by-step
assembly photos of everything in the panels except the absorber (no
matter what lighting I tried, the absorber still showed up as a big
black rectangle without any visible details). That sharing was
sufficiently abused that those photos were removed.

Two of the highest priority goals have been maximum delivery of heat and
longevity - not low cost or ease of construction - which led to a design
unsuitable for DIY production. (I had to spend just under $5K for CNC
tooling to cut some of the parts, and about $00 for assembly clamps.)

Worse, the primary absorber material (highly-reflective black aluminum
ribbon) needed to be special ordered from overseas from a company that
only wanted to sell in full cargo container quantities. In order to get
material for prototyping, I had to order (and pay a premium for) a 25km
_sample_ quantity. Not something the average DIY builder is willing to do.

Assuming you're (still) interested in knowledge, I've put as much of the
simple stuff as I could articulate onto my web site. It's somewhat
scattered about - but it's there to help those who want to learn.

I recommend "Introduction to Heat Transfer" by Frank P. Incopera and
David P. DeWitt (Wiley) ISBN 0-471-61247-2. It's a bit of a grind, but a
good source.

Wikipedia has a number of excellent articles on black body radiation and
flow dynamics. If you can get through the discussions of Planck's work
without feeling like your head is going to explode, you're a better man
than I - but this stuff is absolutely essential to the design of a
really decent absorber. You won't need to actually /use/ the equations
as much as to /understand/ what they tell you about the way this
universe operates.

Performance numbers? Would those be for Ypsi or Denver or Halifax? Sea
level or a mile above? If I were to publish numbers, the only ones that
would make any sense would be for performance at sea level on the winter
solstice under absolutely ideal conditions - which no one in the real
world would likely ever experience, and which would have the effect of
misleading everyone. If you believe otherwise, you're kidding yourself.

I kid you not.

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by schooner on November 13, 2009, 6:25 pm

Ok thanks, nevermind.

Posted by Josepi on November 13, 2009, 10:04 pm
 Too bad all aren't closer geographically. Kudos to you for doing the
documetary and passing information but it would be reall nice to do a bus
tour of projects some day. Did I say "some day". Some year!...LOL

Posted by Morris Dovey on November 13, 2009, 10:46 pm
 Josepi wrote:

If you'd like to look, let me have a couple of days warning and I should
be able to provide the tour. (Don't put it off too many years!)

Morris Dovey
DeSoto Solar
DeSoto, Iowa USA

Posted by Josepi on November 14, 2009, 4:21 am
 LOL. I meant it would take a year to tour all the sites.

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