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solar panel config

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Posted by oldhallugthorpe on September 10, 2007, 8:36 am
 
Q.I have 6 traditional wet solar panels but no south facing roof, I
was thinking of putting 3 facing east and 3 facing west on an apex
roof, will one set cool the output of the other set.
does each set of three need to be in series or parallell or a
combination of the two?


Posted by gary on September 10, 2007, 3:06 pm
 
On Sep 10, 2:36 am, oldhallugtho...@tiscali.co.uk wrote:

You might think about putting them all on one side (all east or all
west), this way they would all be heating at the same time.
If you keep them on opposite sides, you might want to use two
differential controllers and two pumps -- one set for each side.
I think that the ones on the non-sunny side would actually cool the
water going through them.  This would depend on the outside
temperature and on the diffuse light light levels.  For a typical flat
plate collector with an ambient of 40F and collector temp of 110F with
50 BTU/sf-hr diffuse sun, I get a negative efficiency.

Is there no way you can get them all oriented more southerly?  On the
ground?  Mounted on the south wall of the house?

Do you plan to use the heat output for domestic water heating or for
space heating?
What is the slope (pitch) of your roof?

Gary


Posted by Brian Graham on September 10, 2007, 7:20 pm
 A buddy of mine has an East-West roof as well. His solution was to build a
knee-wall with various height studs so that the top board was level. Voila - You
now have something to mount south-facing panels on.

By the way, I have a pair of 4x8 flat plate collectors facing south. They
practically boil 40 gallons all summer!

I imagine you're planning on supplemental heating with those in the winter? But
what do you do with the surplus heat in the summer??
--
Brian

Q.I have 6 traditional wet solar panels but no south facing roof, I
was thinking of putting 3 facing east and 3 facing west on an apex
roof, will one set cool the output of the other set.
does each set of three need to be in series or parallell or a
combination of the two?




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