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DIY Solar collector question - Page 2

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Posted by Bert Menkveld on August 27, 2004, 12:44 pm
 
Hi Keith,

I wouldn't worry too much about small details.  If you've got copper tubing
bonded to a copper aborber with not too much space between the tubes
(usually 4" to 8"), and you've got a dark colour on top to absorb the
sunlight, and you've got some kind of glazing in front and some insulation
behind the collector plate, then you will have a solar collector that's
quite effective.  It won't be quite as efficient as a commercial collector
with selective absorber and low-iron glass, but it will work just fine.

I think the great thing is to get started with something that actually
produces some useful warm water, rather than to spend too much time
wondering about optimizing the design.

Good luck, and let us know how it works for you.

Regards,

Bert Menkveld



Posted by nicksanspam on August 28, 2004, 1:40 pm
 


Not very big.


Copper sheet is a very good heat conductor.

This should allow wide pipe spacing...


What's "liver of sulfur"?


Would you know its absorptivity and emissivity?

Nick


Posted by Duane C. Johnson on August 28, 2004, 4:20 pm
 Hi Nick;

nicksanspam@ece.villanova.edu wrote:
 

Lead Sulfate, (maybe sulfite), it turns copper very black.
It can be gotten at hobby stores.
It is used to blacken copper artwork.
I believe the black surface is copper oxide.
http://www.redrok.com/concept.htm#absorptivity



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Posted by N. Thornton on August 30, 2004, 9:23 pm
 

anything will, bits of iron wire tied round it will work, wire ties,
whatever you want.



What will make more difference than all those combined is a reflector.
If you can arrange some reflector to put light onto the panel even if
only for part of the day, the thing will be a lot more useful. Not
only will you get more power out, but you'll get hot out in lower
sunlight levels and lower outdoor temps.


NT

Posted by nicksanspam on August 31, 2004, 10:52 am
 


The tubing-to-plate connection needs a very high thermal conductance,
something like a continuous metal-to-metal bond. Bits of wire won't
work for that.

Nick


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