X-Message-Number: 32273
From: 
Date: Wed, 30 Dec 2009 15:47:14 EST
Subject: open cell foam?

Yvan writes:
 
>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.
 
I'm afraid I don't understand this. Is the foam itself (please describe) 
a heat sink? Is the nitrogen in the cells liquid or gaseous? In any  case,
could you please describe the details?
 
Thanks--
 
Robert Ettinger



 Content-Type: text/html; charset="US-ASCII"

[ AUTOMATICALLY SKIPPING HTML ENCODING! ] 

Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=32273