Acidic glycol in solar thermal. [RE-wrenches]

[Darryl Thayer]

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Here is my experiance and guesses.  I have tested many
systems, and find if the system is buffered, it lasts
in most systems for several years I have tested
several systems after 10 years (one after 20 years)
and found it to still have some reserve alklinity. 
The systems that get the hottest go acid first.  I
used to use a double glased selective surface
collector that would go acid in one or two years (no
staganation protection on these systems)  

Antifreeze without buffers, such as pure food grade or
even pure ethylene glychol fail because they do not
have a buffer added.  ( a buffer is alkline added to
nutralize the acid.) 

If you have a system that has gone acid, dump it and
refill with a buffered solution.
Darryl 

--- "Carl Emerson, Free Power Ltd."
<freepower at freepower.co.nz> wrote:

> Your free subscription is supported by today's
> sponsor:
>
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> your PC
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> 
> Paul,
> 
> We use food grade glycol and that can be expensive
> in a larger system...
> 
> =====================================
> 
> Drain it and refill?
> 
> Carl Emerson, Free Power Ltd. wrote:
> 
> >Hi there,
> >
> >If after a few years the mono-propylene glycol
> starts to become acidic in a
> >closed loop solar thermal system, what remedy is
> used to increase the pH,
> >any suggestions ??
> >
> >Thanks,
> >
> >Carl Emerson
> >Free Power Ltd.
> >Auckland NZ
> >
> >
> 
> 
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