Posted by SJC on December 4, 2006, 2:42 am
Sunearth makes absorber plates.
You might have to contact them for a distributor.
Posted by Steve Barker LT on December 4, 2006, 5:13 am
Thanks some more!
Posted by Gary on December 4, 2006, 9:46 pm
Steve Barker LT wrote:
I used SolarEnergy.com on my collectors, and I was pleased with them and the
product. We had some freight difficulties (two totaled shipments), and they
hung in there through all that.
Give them a call on the phone and ask for Tim.
These are the collectors I built using their absorber plates:
At the time I ordered them, they were charging $68 for the 4X10 ft with
There are some other potential suppliers listed here:
Be aware that the Sunray absorbers are a different sort of construction -- they
mechanically bond an alum fin to copper risers. The absorber fins are painted
with a non-selective black paint. This is not to say they are bad -- I very
nearly went that way.
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Posted by Steve Barker LT on December 5, 2006, 12:43 am
Howdy Gary! It was from your site that I got the idea to use these people.
<G>. I'll give them a call tomorrow. Let me pick your brain a bit whilst
I have you on the line. I've got a total of 1300' of 1/2" pex in a slab in
a 30x40 building. I want to keep it above freezing. The goal is not
necessarily to HEAT the building but to keep the slab and the things sitting
on it just above freezing. I'm in eastern Kansas. How the heck do you know
how much collector and how much circulator pump you need?? So far, I've got
the tubes manifolded up with a home built manifold with individual ball
valves on each of the 5 circuits. I plan to plumb from the manifold out to
the panels with insulated cpvc and use either rv antifreeze or plain ol'
ethylene glycol for my fluid. Thanks for any input you may have and feel
free to email me at constructioninfo at barkerranch dot net
Posted by sylvan butler on December 6, 2006, 6:08 pm
On Mon, 4 Dec 2006 18:43:31 -0600, Steve Barker LT
Nice requirements description.
Circulator pump is easy, if you like math... Inputs: maximum length
(and types) of tubing, resistance per foot from manufacturer, desired
flow rate (within range recommended by mfg). Get a pump big enough to
push the desired rate against the resistance in the tubing.
As for collectors... You could calculate how much BTUH you need to meet
your temperature specs, but unfortunately that must include all sorts of
heat loss factors that are difficult to quantify. Then you can calc how
much collector area you need, multiplied by the efficiency of the
collectors, multiplied by the efficiency of your system. Probably best
to get an experienced person to do an on-site evaluation. Barring that,
approximate and be prepared to add more collector area if needed.
Maybe I missed it, but are you going to do any heat storage? Or just
circulate thru the slab and collector whenever the collector has heat?
The second approach means a seperate pump and collector for each loop,
or else it gets really challenging to try and balance the system. Heat
storage may be easier and even cheaper since you don't need storage for
very long (your primary store will be the slab and earth below). You
can treat heat from collectors into tank and heat from tank into slab as
two nearly independent systems.
Wanted: Omnibook 800 & accessories, cheap, working or not
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