X-Message-Number: 2003
Date: Sun, 21 Mar 93 18:50:20 CST
From: Brian Wowk <>
Subject: CRYONICS Peltier Effect

        I have thought of a more efficient passive temperature control 
system than a heating element in the dewar.  The problem with the 
heating element idea is that no cooling benefit is derived from the LN2 
heat of vaporization.  Instead of a heating element, why not put a 
thermopile (collection of thermocouples) in the dewar connected to 
another thermopile on the room ceiling.  By controlling the electric 
current flowing between the two thermopiles, you can control how much 
heat is pumped from the ceiling into the dewar.  This also is a purely 
passive electronic temperature control system with no moving parts to 
fail.
 
                                                --- Brian Wowk

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