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Posted by Gary on October 15, 2006, 2:11 pm
 
Jeff wrote:

Hi Jeff,

I found that one relatively cheap source of alum around here is the stuff they
sell to finish soffits on houses.  I believe that the stuff they sell here is
0.02 thick.  Its wider than one fin, so it would have to be cut lengthwise, or
each piece might hold two risers.  Its comes prefinished in a variety of
decorator colors :)  8 ft long.

Gary
--


Gary

www.BuildItSolar.com
gary@BuildItSolar.com
"Build It Yourself" Solar Projects









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Posted by Mike on October 15, 2006, 8:07 pm
 
Hi Jeff

Use 2 pieces riveted together with your copper riser tubes in the middle,
this will effectively double the thickness allowing
better heat transfer to the copper tubes. Uses double the amount of
materials, but at least can use what you have. Make the riser spacing 125mm

Mike





Posted by Jeff on October 16, 2006, 1:35 am
 Mike wrote:

   Hi Mike,

   I haven't cut the copper yet, but I was going for 4 tube in my ~ 2'
wide box. That would have been ~ 140mm, but that is before I bought a
micrometer and found my aluminum was not 24 gauge (with the back brace
aluminum and solar paint I should be able to step that down form 22
gauge)! Thanks for keeping up with me!

   Cheers,
Jeff



Posted by Mike on October 16, 2006, 8:57 am
 Aluminum can be difficuilt to bend unless you have the right tools, the
thinner stuff will be easier to work with if youre using some sort of DIY
home made press.

Mike




middle,


Posted by Jeff on October 16, 2006, 1:33 pm
 Mike wrote:

   I was thinking about keeping the thin stuff and buying something a
little thicker for a flat plat on front. The thinner stuff will get cut
and formed to make the back straps (it forms easily). Wonder if there is
any electolysis between two different aluminum alloys?

   Man, there is always something!

  Jeff


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