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SHW Fluid Copmparison

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Posted by Steve Sherman on August 21, 2003, 3:16 am
I am planning a solar hot water system (flat panel collectors, pumps,
etc) and am curious to get some input on what the best fluid for running
in the collectors loop would be.  This is a closed loop system (no drain
back) and is in a freezing environment, so either antifreeze or oil come
to mind.

I have heard the pros and cons of each, pbut wanted to gather some more
info.  For example:

1. Does AF/H2O have a better heat carrying capacity than the oils?
2. If on washes the loop, prior to filling, can the AF/H2O mixture last
more than a few years before turning acidic?

Any other considerations, suggestions?


Posted by Ivan Lucas on September 4, 2003, 11:37 pm
some of the tyfocor chemicals would of course be illegal to use here in the
UK for domestic hot water, as there is a requirement to use NON-TOXIC
chemicals. In theory you could use salt solution, but you might have a
corrosion problem. Most people use the fernox antifreeze, available from
plumbers merchants. It is non-toxic, propanol-based, i think, and quite
reasonably priced at around 11/5litres.  - though you can probably buy
cheaper in China!!

Posted by Bert Menkveld on September 5, 2003, 9:43 pm
 That sounds like a great antifreeze product.  Does anyone have any links to
similar products available in Canada?

Bert Menkveld


Posted by Bert Menkveld on September 6, 2003, 4:44 pm
 There are some propylene glycol based antifreezes available for automotive
use.  Would these be appropriate for use in a solar loop?

Bert Menkveld

"Bert Menkveld" <bertATreentronicsDOTcom> wrote in message

Posted by Ivan Lucas on September 13, 2003, 12:03 pm
 any antifreeze for use in cars would work in solar systems - the question is
whether it is non-toxic or not. From what i understand, propylene glycol is
non-toxic at low concentrations, and you shouldnt be drinking the hot water
anyway, so it should be ok - but i cant give any assurances for liability


"Bert Menkveld" <bertATreentronicsDOTcom> wrote in message

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