Re: GBlist: Solar hot water heat exchange fluids.

Hal Levin (hlevin@cruzio.com)
Wed, 19 Mar 1997 09:33:16 -0800

At 12:13 PM 3/19/97 +0000, you wrote:
>I'm looking into retrofit alternatives to ethylene glycol for closed
>loop solar hot water systems. I've had polyethylene glycol
>recommended.
>
>Who can suggest suppliers of PG? How toxic is it?
It is far less toxic than EG. But everything is toxic at too high a
dose. There is food grade PG available, but you probably don't need that.

Are there different
>grades available.
>
>I've heard of "food grade" PG.
>I've heard that diesels and some rec vehicles use PG, maybe different
>grade.
>What performance differences might be expected compared to EG in this
>application?
>
>Thanks for any help,
>
>
>-------------------------------
>540-894-5126 Twin Oaks
>mccune@twinoaks.org
>http://www.twinoaks.org
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>.-
>
>

Hal Levin <hlevin@cruzio.com>

__________________________________________________________________
This greenbuilding dialogue is sponsored by Oikos (www.oikos.com)
and Environmental Building News (www.ebuild.com). For instructions
send e-mail to greenbuilding-request@crest.org.
__________________________________________________________________