Proplyene Glycol Mix Vs RV Anti Freeze

5 Posts

Dec 12, 2007 10:06 am

Hola,
In the past I have ran RV Anti Freeze in my Closed Loop Solar system..QUESTION:: Is the heat gained from each fluid comperable? or is the Glycol mix that you do a 50/50 mix on noticebly better for hot water heat exchange thank RV Anti Freeze which is basically watered down Propy Glycol??

Chris Brown

52 Posts

Dec 12, 2007 10:51 pm

Re: Proplyene Glycol Mix Vs RV Anti Freeze

The folks over at AET recommend Sierra antifreeze:

http://www.sierraantifreeze.com/

The folks over at Heliodyne sell their own PG:

http://store.altenergystore.com/Solar-Hot-Water/Accessories-MISC-SYSTEM-COMPONENTS/Heliodyne-Non-Toxic-Propylene-Glycol-2-Gallon/p5942/

Both of these solutions are propylene glycol and both should be mixed with water. I've heard of a few different ratio's of water to PG through around but 50/50 seems to be the most common. According to the MSDS for both products the Sierra antifreeze is 94%-96% PG and Heliodyne Dyn-o-Flow is 94% PG.

http://store.altenergystore.com/mmsolar/others/Dyn-O-Flo_HD_MSDS.pdf
http://www.sierraantifreeze.com/images/sierra_msds.pdf

Some car/rv antifreeze solutions are ethylene glycol- which is more toxic the propylene glycol. EG is not for use is a solar thermal applications and if your going to buy antifreeze for domestic hot water heating make sure to use PG and a double wall heat exchanger.

Tom M

462 Posts

Dec 13, 2007 02:17 pm

Re: Proplyene Glycol Mix Vs RV Anti Freeze

Dan, check with your local plumbing supply. They sell a product called Cryotek. It is specifically made for use in heating systems and it is what I use in SHW systems for it's heat retention properties and it's non-toxic formula. Mimimum mix is 50/50, but I usually use near 100% initially to allow for losses when servicing or if leaks occur.

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Proplyene Glycol Mix Vs RV Anti Freeze

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