X-Message-Number: 32267
Date: Tue, 29 Dec 2009 14:40:33 +0100
Subject: Re: temp without LN2
From: yvan Bozzonetti <>

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> From: 
> Subject: temp without LN2
>
> Yvan mentioned the potential usefulness of transporting
> at liquid nitrogen temperature without using liquid nitrogen.
> I and others have mentioned this in the past, and in
> principle it isn't difficult. You just supercool dry ice
> (for example) to liquid nitrogen temperature and insulate
> well. The experiments to determine parameters have not
> yet been done as far as I know.
>
> Robert Ettinger
>

 What I was writing about is far simpler:
It is a LN2 cryostat lined with a kind of mineral "sponge".
To use it, you fill it up with LN2, a large part of it cool the "sponge" and
get absorbed by it.
After some hours, the equilibrium temperature is reached.
You then drain the excess LN2 or let it evaporate.
You have a dry cryostat with a capability to remain LN2 cool for at least
two week.
I have experimented with such a system, it work well.
You can put it in any position, there is no liquid spill, an important
feature for transportation.
The system I have seen is loaded with near 8 gallons of LN2 and has a free
volume of 6 gal.
I don't know if there are larger systems on the market.
Yet, even if there is no one, they could be built simply with open cell foam
in an ordinary LN2 cryostat.

Yvan Bozzonetti.

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