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Propylene Glycol Heat Transfer Fluid - Page 2

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Posted by Ecnerwal on May 23, 2005, 2:06 pm

Not new at all. Late 1970's collectors (at least) used this fluid.
You've probably drunk some if you've ever had a diet soda - they put it
in to replace the mouthfeel of sugar. US codes seem stuck on doublewall
exchangers; code people presumably fear toxic antifreeze being used by
idiots more than they fear the performance hit of doublewall exchangers;
ie, they would prefer to save the lives of a few idiots rather than
allow systems to work efficiently. Evidently Canada has codes written
with some idea that it would be good if solar systems actually worked.

Posted by Anthony Matonak on May 23, 2005, 5:23 pm
Ecnerwal wrote:

I don't know how much of a performance hit (if any) you get with
doublewall exchangers but it seems to me that it would be a good
idea to write codes with saving lives in mind.


Posted by Gary on May 23, 2005, 6:22 pm
 Anthony Matonak wrote:

According to the Home Power issue 92 article the efficiency penalty
for a "well designed" double wall heat exchanger compared to single
wall is only about 5%.
But, there is also some initial cost increase, and the double wall
requirement eliminates some of the easy DIY designs.


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Posted by DJ on May 23, 2005, 10:05 pm
Anthony Matonak wrote:

You have to move heat through another layer of metal, and whatever
fluid is between the two layers, if any. Obviously, it has to cost some
efficiency to do that.

Yessum, it is, indeed. Now, remember not to put javex/clorox or liquid
floor wax in your milk container in the fridge. That would be
dangerous. There oughta be a law... ;-).

And tomorrow, go out and get a breathalyzer override on your car's
ignition, and a speed govenor on it too; better safe than sorry!

Sure, I'm being a smartass ;-). But, ya gotta admit that you can't
legislate away moronic behavior, and trying to is rather irritating to
the rest of us.

No lives would be lost if people tasted food-grade glycol in their
drinking water. However, leaving toxic automotive glycol lying around
(and what garage doesn't have it lying around) kills alot of pets and
probably a few kids every year. Last time I checked, lethal dose of
that stuff was something around 50mls... Maybe we should have a law
banning THAT stuff ;-).


Posted by caraug on May 24, 2005, 12:14 am

I have read carefully the technical description of Thermo-Dynamics' system
and it looks as if they are using some sort of double wall heat exchanger
since they mention that the glycol loop would leak into their Solar Boiler
and be detectable as it operate at atmospheric pressure.  So it looks as
they are on the safe side...

I am rather impressed by the technical quality of the info these guys
provide on their website.  I can only assume that they are as careful in
their design as they are for their technical descriptions.

Thank you all for your feedback.


DJ wrote:

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