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solardan1959

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Reply with quote  #41 
Keith,
  looking real nice so far!
What are you butting end to end? the flashing?  1/8 of an inch might help and won't hurt.  you could also overlap it so it's not an issue.
Dan

Keith671

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Reply with quote  #42 
Dan,
I am butting the grooved plates end to end. They are only 24" long, so I have 2 1/2 plates per row. I read somewhere that you should never overlay them on the ends as this will keep them from sealing properly around the copper tubing. I seem to agree with you on the 1/8" gap.

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Keith R. in PA.
solardan1959

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Reply with quote  #43 
Keith,
My CPVC expands and contracts a lot, The copper tube may expand a little but not much. 1/16 should be plenty as it is mostly contracted when you put it together.  Any expansion of the tube should be matched by the fin. so the 1/16 of an inch may slightly increase though I doubt you would notice.  But it should never contract enough to overcome that 16th of an inch.  Hopefully somebody will have a more technical response based on a little fact.
Dan
GaryBIS

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Reply with quote  #44 
Hi Keith,
Good question -- had not really thought about it.

Alum and copper are not to far apart in thermal expansion coefficient (12 vs 9), but the alum does expand a bit more, so maybe a small gap would be a good thing.

It looks like on my collector I did not aim for any consistent gap, and some of the fins are nearly touching the next one.  I've not seen any sign of wrinkling of the fin from that.

Gary
Keith671

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Reply with quote  #45 
Hi Guys,
Has anyone bought from this store? http://stores.ebay.com/Pex-Tubing-Store?_rdc=1  I think it is only on ebay. Seems they have pretty good prices and a lot of stuff is free shipping. 

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Keith R. in PA.
GaryBIS

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Reply with quote  #46 
There prices appear to be about the same as PEXUniverse.com  

I've ordered from PEXUniverse several times and had no problems.

Gary
handymanhdw

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Reply with quote  #47 
Keith, why did you use the metal plating over the copper?  I would have put the metal plating below the copper tubing, painted the copper tubing black, wouldn't that absorb/transfer more heat directly to the flowing water? 

I guess you could ask the same of my project with me putting the alum cans over the pvc piping I used, but copper is the greatest conductor?  I left a small 30 inch piece of copper in my collector (between two pvc elbows, and installed the snap switch right over that piece of copper just to get more action from my snap switch.   Because logically, the pvc will take way longer to heat up and cool down.  Copper should be way more quicker, especially in direct sun and painted black or dark color, or heck, even left alone..(it will get darker over just a short period anyhow.  Great looking project though!  Just my thoughts...
Gary Z
Handymanhdw
Keith671

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Reply with quote  #48 
Gary Z
I put aluminum coil stock under the pipes and then ran a bead of caulk along each side of the pipes. I then put the aluminum fins over the pipes with a small bead of caulk in the groove. This is the way most traditional collectors are made. The fins are to draw the heat between the pipes to the pipes.  Here is a link on Gary's site showing you.
 http://www.builditsolar.com/Experimental/PEXCollector/SmallPanelAirVsSilicone.htm



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Keith R. in PA.
Keith671

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Reply with quote  #49 
Finished installing the fins last night and painted it all flat black. I found some door and window casing I had removed in a remodel and ripped it down to 1 1/2" to use to hold the glazing in.  I put a cote of paint on it and quit for the night. Leaving to go to camp tonight for the 4th. Hope everyone has a good holiday.  
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Keith R. in PA.
Keith671

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Reply with quote  #50 
Working on some supports to mount the collectors on and was wondering about the angle. I was going to set the tilt angle at 60 degrees, but I guest there must be a formula for that. I remember reading about it but don't know where to find it. Here is my coordinates  W78 17  N41 03 if someone could give me some input I would appreciate it.
Thanks

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Keith R. in PA.
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