Apparently this is the "modern" design method used in many european
systems. It scares me too. But from several sources, this seems to be
considered one of the most reliable design methods for closed loop
systems (ie. it works even without electronic controls working, power
outages, etc).
Standard glycol. The main point seems to be the design of the pipes
and collectors need to facilitate collector draining from the steam
pushing the fluid back into the expansion tank, so the collectors
empty themselves. Its closed loop, but effectively becomes a
"pressurized drainback" in over heating conditions.
Here is a couple of links:
http://www.aee-intec.at/0uploads/dateien48.pdf
http://www.suterconsulting.com/CISBAT.pdf
I'm hoping to find someone with experience with this kind of system to
overcome my fears
Troy Harvey
---------------------
Heliocentric
801-453-9434
tahar...@heliocentric.org
On Apr 23, 2009, at 11:04 AM, Dana wrote:
I have only seen boiled glycol turn to a cola like syrup that had to
be
purged and removed.
What kind of system & glycol is this?
Where would you expand that much?
Can you provide a link to this paper?
We use heat dumps.
Dana Orzel
Great Solar Works, Inc
www.solarwork.com
E - d...@solarwork.com
V - 970.626.5253
F - 970.626.4140
C - 970.209.4076
"I'd put my money on solar energy. I hope we don't have to wait 'til
oil and
coal run out before we tackle that."
-Thomas Edison, in conversation with Henry Ford and Harvey
Firestone, March
1931
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Troy
Harvey
Sent: Thursday, April 23, 2009 10:43 AM
To: RE-wrenches
Subject: [RE-wrenches] Solar Combi-systems: Heat dump or Stagnate?
I'm wondering how many of you out there have installed medium sized
solar hot water systems (6-8 panel) that were designed to stagnate
during summertime over production as opposed to diverting to a heat
dump or radiator? The International solar agency has a couple of
papers that show a properly designed system should be able to stagnate
in a way that the boiling glycol mix vapors in the panels, purge the
panels of fluid, turning off the system without degrading the glycol.
That doesn't seem to be a typical way to design systems in the U.S. ,
we've usually gone to a heat dump. Does anyone have experience with
this?
Troy Harvey
---------------------
Heliocentric
801-453-9434
tahar...@heliocentric.org
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