Posted by gosolar23 on November 9, 2005, 11:18 pm
Or less than $/ft.
Went to the hardware store. 40'x15' Trickle collector. Each panel
of 26 guage Black Galvy steel is 3' by 15. 12 'valleys' each about 3"
wide. 1/4" polycarbonate top, two panel
Durable steel panel with 40 year paint,black, $00.
Flashing, Silicone $00
My only question is: How well will the galvanized valleys 3" wide
conduct heat to the trickling water?
Per square foot costs are much less than other options.
Posted by Jeff Thies on November 10, 2005, 3:26 am
Not well, I would think.
Steel has about a fourth the conductivity of aluminum and that is mighty
thin steel at that. Most of the heat will be reradiated before it can
travel up to six inches through that thin steel plate.
Have you ever picked up a steel sauce pan by it's handle? And that is
much thicker metal.
Posted by gosolar23 on November 10, 2005, 7:07 am
Nobody is making corrugated aluminum roofing in the Seattle area (that
I can find). www.jamesriversteel.com seems to have something in
aluminum that would work, but shipping will be expensive. I will look
into that tomorrow.
It seems to me that much of the heat transfer might occur in the air or
space as the heated air comes in contact of the cooler liquid. Boy
at around $/sf. Painted and nice design, it sure is hard to beat.
Posted by Jeff Thies on November 10, 2005, 6:54 pm
Are you using this for domestic hot water? Or heating your home.
I think the temp gain is going to be small for hot water, perhaps you
should look at a solar air heater instead. Then you could use those
Posted by gosolar23 on November 10, 2005, 8:53 pm
Well that is a good question. I was going to use it for preheating DHW
and hydronic. I was going for high volume, low temperature thing.
On the order of 5,000 to 10,000 gallons.
I am trying to maxamize all the above and make it as efficient as
possible. Any and all thoughts are apreciated. I am having a ball
designing. My storage will be down 46' from the peak (4 story house).
The shed dormer is big 15' by 40' or almost 600 sf but angled at a
measly 20 degrees.
We get a majority of our sun from April to September, so I was hoping
to put some into savings if you know what I mean and make 'hay' when
the sun is shining.
Always moderate and frequently cloudy, Seattle Washington.