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Keith671

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Posts: 142
Reply with quote  #21 
Gary,
Do you see any problem with going with all 1/2" on the headers for the copper ones? There will be two collectors this size. I am planning to feed them with 3/4" or 1" Pex. Down the road adding more collectors.


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Keith R. in PA.

GaryBIS

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Posts: 243
Reply with quote  #22 
Hi Keith,
I did this test on flow distribution for  a 4 by 8 ft collector using all half inch (headers and risers):

http://www.builditsolar.com/Experimental/CopperAlumCollector/FlowTest.htm

It certainly worked fine for 4 ft wide, and I'd feel pretty comfortable with going somewhat wider, but I'm not sure what the upper limit is.  You do want to be sure to use the reverse return type of plumbing -- that is, supply comes into one lower corner of the collector, and return is from the opposite upper corner -- this makes the total flow path for each riser the same.

Gary

GaryBIS

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Posts: 243
Reply with quote  #23 
Hi again,
Looking back, I think I see that your collectors are 30 inches wide.  I think that 60 inches with half inch manifolds would be fine based on the 48 inch test.

Gary
solardan1959

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Reply with quote  #24 
Keith,
   My all 1/2 inch CPVC seems to be fine with plenty of flow.  I noticed, (or at least did not see copper tees in your list of parts and that would jack up the price a lot.  Again contractor packs of tees are a much better price and if you could stretch for the copper you would have a longer lasting, less likely to fail from overheating collector.  Despite that they work and can be prevented from overheating, you are much more at risk from CPVC. (and it will work at least a little bit better)
Dan
Keith671

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Posts: 142
Reply with quote  #25 
Painted Boxes last night, when they say caulk is not paint-able they mean it. The caulk I used wouldn't take the paint. Plan on getting some copper pipe after work. Decided to go with all 1/2" copper since these are pretty small collectors.

30" X 68" Copper  1/2" Header  8 uprights on 3" Centers

50ft  1/2" Type M copper        $11.00 ea     $55.00
16    1/2" Tees                         1.08 ea.      17.20
1/2"  elbows                               .80 ea.       3.20  
Solder                                   Have
Flux                                      Have
Misc                                                        10.00

Total                                                      $75.40 
 

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Keith R. in PA.
solardan1959

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Reply with quote  #26 
Keith I thought my silicone sealant was paintable also but that must have been the other tube, I had the same problem but it on the back so it does not really matter.  Would have said something but did not want to point out another mistake, I have already done that enough.  (woops, did it again)
Helps to actually read the lable,
Dan
Garage_Hermit

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Reply with quote  #27 
Keith,
That copper in France would cost just about TWICE that !

G_H

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Keith671

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Posts: 142
Reply with quote  #28 
Dan,
I did read the tube, but I thought it really doesn't mean it. Mine's on the back too.


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Keith R. in PA.
solardan1959

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Reply with quote  #29 
Keith,
I was afraid you might take it that way, was more of a dig at me.  You at least said you knew it was non paintable but tried it anyway, I just assumed it was as that is what I normally buy.  This stuff I must have picked up to use in a panel or around the glass. 
Dan
Keith671

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Posts: 142
Reply with quote  #30 
Dan,
I was making a dig at me. Joking. After reading the tube I still went ahead and used it. Sometimes on the net you can't tell how someone else is going to take what you said. I realize you seem to be joking about stuff, so I will not be offended by anything you might say. And I hope it goes both ways.

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Keith R. in PA.
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