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Tree of Life

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Reply with quote  #1 
We are planning a solar hotwater system in Newfoundland in line with your mega collector, and have a couple of key questions.

1. I think having horizontal supply & collectors has to be better for flow through the collector? A lot of resistance in a contiguous serpentined CPVC line?

1. Could or shouldn't the horizontal collectors in the CPVC be a larger diameter (~3/4 or 1") than the vertical risers  (1/2"). Seems to me that this would result in much less resistance of water convection for the thermosiphon system?

2. Is there an advantage to having the corrugated glazing or will the flat-surfaced polycarbonate suffice. I am thinking that the corrugated presents more challenges for sealing.

Not sure I posted these questions in the right place so let me know.
Thanks for this great site
Ian


SolarInterested

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Spam Stomper
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Reply with quote  #2 
Quote:
Originally Posted by Tree of Life
We are planning a solar hotwater system in Newfoundland in line with your mega collector, and have a couple of key questions.
I believe you mean Scott's project:
http://www.n3fjp.com/solar/BigProject/BigProject.htm
Quote:

1. I think having horizontal supply & collectors has to be better for flow through the collector? A lot of resistance in a contiguous serpentined CPVC line?
Yes that's correct.

Quote:
1. Could or shouldn't the horizontal collectors in the CPVC be a larger diameter (~3/4 or 1") than the vertical risers  (1/2"). Seems to me that this would result in much less resistance of water convection for the thermosiphon system?
That's a typical arrangement (3/4" headers with 1/2" risers)

Quote:
2. Is there an advantage to having the corrugated glazing or will the flat-surfaced polycarbonate suffice. I am thinking that the corrugated presents more challenges for sealing.
The corrugated glazing may be cheaper but as you mentioned sealing with it can have it's challenges. I think the flat glazing looks better too.

Quote:
Not sure I posted these questions in the right place so let me know.
Thanks for this great site
Ian

Ian your post has been moved here  to the Solar Liquid (Hydronic) Collectors section and into it's own thread. Looking forward to hearing more about your project.




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Both temperature rise and airflow are integral to comparing hot air collectors
Rick H Parker

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Reply with quote  #3 
1. I think having horizontal supply & collectors has to be better for flow through the collector? A lot of resistance in a contiguous serpentined CPVC line?

For a given length of pipe, shorter lengths of pipe in parallel have a lower net resistance then the same total length in series.

2. Could or shouldn't the horizontal collectors in the CPVC be a larger diameter (~3/4 or 1") than the vertical risers  (1/2"). Seems to me that this would result in much less resistance of water convection for the thermosiphon system?

The cross section area of the headers should be greater or equal to the sum of all the cross section areas of the crossover pipes.

3. Is there an advantage to having the corrugated glazing or will the flat-surfaced polycarbonate suffice. I am thinking that the corrugated presents more challenges for sealing.

Corrugated has price advantages over Flat glazing.  Flat glazing but has technical advantages over corrugated.


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
griz-525

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Posts: 18
Reply with quote  #4 
Vertical would be better as it facilitates thermal flow, heat rises,  there are charts for line friction on each pipe size  as to glazing I agree that flat is easier to seal, I salvaged sliding door panels for my project, pretty heavy but not prone to breakage.  had to make a check valve as it doesn't take long for the temps to equalize, if there isn't a check to promote flow.  Message Scott Thompson, and watch his vids, he is a master at solar. (my guru)[thumb]
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