X-Message-Number: 2014
Date: 23 Mar 93 16:02:08 EST
From: "Steven B. Harris" <>
Subject: CRYONICS More on -135 C Room
By the way: the container below naturally will also have an
inner metal sleeve to maximize floor/ceiling heat conduction, and
minimize floor/ceiling gradients:
LN2 fill --> -----
| |
----------------| |----------------
| |~~~~~| |
| Foam | LN2 | Foam |
| ______________|_____|______________ |
| ^Conductor Plate^ | <---- Thermal gradient
|_______________________________________| -196 to -135 C
|]-------------------------------------[| |
|] | | | [| |
|] v v v [| |
|] convection [| |
|] [<-- metal sleeve inside
|] [| foam insulation
|] [| |
|] Insulated Main Storage [| |
|] -135 C [| |
|] [| |
|] [| | <-- Foam
|] [| |
+_______________________________________+ |
|
Foam |
|
--------------------------------------------+
Note that all this is much like the earlier model of having the
patient in a metal pod embedded in a foam wall between a liquid
nitrogen reservoir and air. Except that here the entire main
storage room is this conductive pod. These designs, which depend
on permanent temperature gradients in foam rather than gas, are
much more inherently thermally stable than pontoon flotation
systems.
Steve Harris
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