Mike, thanks for your insight, and for the tips.
I did some reading after your post, trying to learn some more. I still don't understand much of the stuff. I have some questions, if you're willing to explain.
You say not to use tubes when doing drain back system, only flat panels. Is this because flat panels are more heat resistant (to stagnant phases)?
As far as I understand, flat plate collectors are copper pipes running through a glass covered collector. Through these copper pipes runs the heat exchange fluid (water & glycol mixture, or just water in drain back systems).
Do I get it right? Are the copper pipes empty until fluid is pumped inside, or are they sealed with some proprietary fluid inside? (like evacuated tubes)
Since evacuated tubes works
differently, I guess that's why they are not as good to use with drain back solar systems.
Quote:
Originally Posted by Mikesolar
You need a 20-30L tank (placed as high as possible) as a water reservoir for 6m2 of flat panels (do not use tubes)
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