I used to have a boiler heating system in my home (wood heat) that used anti-freeze treated water tpumped from the boiler in the garage through the house and back. Water is great for moving heat, but you do need to treat it so it doesn't freeze and burst the pipes. On Wed, 5 Nov 2003, Jeffrey Paul wrote:

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-----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Robert A. Hayden Sent: Wed, 2003-11-05 12:50 To: Joe Abley Cc: Neil J. McRae; Mike Tancsa; Robert E. Seastrom; nanog@nanog.org Subject: Re: cooling systems

I've seen some designs that actually use water as the transport and many-finned radiators at each end. Radiator transfer heat into cold water inside which is pumped up a radiator in the sub-zero temps on the roof and exchanged and then looped back.

I've never once seen sub-zero water pumped through a tube, except maybe on documentaries about the arctic (think core sample). I think it's much more likely a different fluid was used.

-j