X-Message-Number: 4290
From:  (H Keith Henson)
Newsgroups: sci.cryonics
Subject: Re: The "Future Technology" Panacea
Date: 24 Apr 1995 18:40:07 -0700
Message-ID: <>
References: <>

Brad Templeton,  wrote:

>I wonder what the coldest stable place on Earth is, defined as having the
>lowest *high* temperature, not the lowest low temperature.   Probably
>in the antarctic, not in a glacier (they move).   Next bet would be
>a deep lunar cave.

Long time ago this came up.  One concept which came out of it was the
"thermal diode," a passive device which will let you use the coldest
temperature rather than average.  What you do is go underground and
build an insulated chamber.  To get the heat out, use a bunch of heat
pipes.  A liquid boils inside the pipes, rises, and runs back down to
the bottom where it boils again.  A well insulated, deep location
might keep the temperature close to the annual minimum.  If there
were good reason to think civiliztion is about to fall, the massive
one shot building of such a setup might be reasonable.

Actually, this should lead off in another direction.  If you were
freezing patients at such high temperatures, would you want to 
perfuse them at all?  It might be better to use chemical methods
and hope that the freezing locked up water.  There are a lot of
tradeoffs.  LN2 looks like the best bet for the present.  

Keith Henson


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