Re: GBlist: Solar hot water heat exchange fluids.
Alex Wilson (alex@ebuild.com)
Wed, 19 Mar 1997 17:41:26 -0500 (EST)
MdCune wrote:
>I'm looking into retrofit alternatives to ethylene glycol for closed
>loop solar hot water systems. I've had polyethylene glycol
>recommended.
>
I believe you are referring to propylene glycol, not polyethylene glycol.
Food-grade propylene glycol is available (I understand that the stuff is in
Coka cola--not that that means it's safe). Check in the Yellow Pages in
your area under "Solar" and you might be able to find a supplier. I would
avoid use of ethylene glycol.
Alex Wilson
Environmental Building News
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