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Piedmont 06-10-2008 01:46 PM

Flexible copper or Rigid Copper for solar?
I was recommended to post this in this forum from the plumbing.

I'm connecting solar panels, running glycol (closed loop). The loop has to be copper as the panels & fluid can reach up to 300F in the unlikely event there's a power failure at sunny noon time. If power comes back the system will kick on sending up to 300F fluid through the lines. Pex is out. I can't find anything if flexible copper would be okay or not, it would be a heck of a lot easier to run it in the attic than soldering stretches of rigid pipe and glycol is thinner than water and will leak in places water will not so the fewer joints likely the better. Know if there's any downfall to flexible copper?

BillyD 06-10-2008 03:04 PM

I would use either low temp. silver solder or flexable and compression fittings. Both will be expensive.
Good luck.

BillyD 06-10-2008 03:11 PM

Sorry I forgot flare fittings.

Piedmont 06-10-2008 04:26 PM

Thanks, I'm set with the solder my instructions tell me which to use (regular and not silver, 95/5, nor brazing) and no compression/threaded fittings if at all possible. Can't say I've heard of low temp silver or even know what "regular" solder is! I have to solder to about a 1" length rigid copper pipe sticking out of a gasket, takes the right skill & solder to get a good joint without damaging the gasket.

See any downfall using flexible copper to go to/from the panels? I'd like to use it instead of a bunch of rigid pipes, but have only used rigid all my life and don't know if flexible copper can handle the temps or reliable as rigid. Thanks!

Technion 06-11-2008 08:56 AM

I've used standard 15mm copper with compression fittings to run the solar loop and it worked fine (using Loctite 577 for the problem points).
I know other solar systems guys use flexy stainless steel pipes which are much easier to handle (being flexy), but also are more expensive.

geo fan 06-11-2008 09:47 PM

i recently had a solor rep at the hvac service company i work at and he specificly recomended lineset remember plumbers order inside we order outside ther 3/4 is our7/8

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