X-Message-Number: 22153
From: 
Date: Mon, 7 Jul 2003 10:18:24 EDT
Subject: Propane

--part1_150.2145d684.2c3adb30_boundary
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit


LN2 is not the best storage liquid, for cryonics, it is too cold, the 

industrial product is more as liquid air with low oxygen content, that is to 
say, LN2 
has some oxygen, a corrosive product in it. Even 100% LN2 dissolves some air 
and get O2 loaded after some time. This would not be the case if the 
temperature could be raised. 

Solid CO2 is too hot and there is no mass produced liquefied gas at 

intermediate temperature. An electric driven system seems far too unsafe in the 
long 
run, using cold gas N2 from LN2 is rather complex and don't give a good 

security, there is nearly thermal inertia if the inflow is stopped for some 
hours.

I suggest to use cooled Propane. The hot liquid would be collected at the 
surface and cooled by boiling LN2. This system would have the same thermal 

inertia that the direct LN2 storage but temperature could be controlled between 
the 
boiling propane point and the solid one. Some N2 could be dumped over propane 
so that there is no contact with air and oxygen. I don't know if such a system 
has been studied or best tested.

Yvan Bozzonetti.

--part1_150.2145d684.2c3adb30_boundary

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

[ AUTOMATICALLY SKIPPING HTML ENCODING! ] 

Rate This Message: http://www.cryonet.org/cgi-bin/rate.cgi?msg=22153