Drainback vs. Closed Loop Circulators [RE-wrenches]
solarpro at aol.com
solarpro at aol.com
Wed Jun 7 18:56:31 PDT 2006
Hello SHWrenches:
Drainback systems for space heating is very good advice. Even if you have a
"dump" load, pool/spa/geothermal, a closed or 'open' loop system will overheat
if (WHEN) something goes south.
I've never come to closure on one issue re drainbacks - is it better to use
distilled/de-ionized water or tap water? I understand that "tap" water covers
a lot of territory, but the only drain-backs I have had serious problems with
were systems using distilled water - actual copper tubing failure unrelated to
erosion corrosion. I've seen waterways turn to copper foil. I suppose it
could have been due to high heat in a moist environment but somebody a long time
ago told me that distilled water is "hungry" and will eat away metals. It
does seem that the best way to resolve this issue is to use a buffered glycol,
but pump head and heat absorption do suffer.
Anybody copy my experience with distilled or de-ionized water?
Patrick A. Redgate
AMECO
Long Beach, CA
(562) 595-9570
www.amecosolar.com
In a message dated 6/7/2006 5:14:18 PM Pacific Standard Time,
conradg at cape.com writes:
Hi Ken,
No confusion between Draindown and Drainback here.
And I don't mean to imply that our experience with drainbacks is universal.
Just reporting in from the feild without a lot of detail.
My opinion on the issue is that you go to a drainback for a space heating
system but stick to a closed loop for SDHW.
your glycolhead,
Conrad Geyser
Cotuit Solar
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