X-Message-Number: 2026
Date: Thu, 25 Mar 93 14:29:15 CST
From: Brian Wowk <>
Subject: CRYONICS Freeman Model

        Tim Freeman's idea for modelling the edges and corners of the 
room as sections of cylinders and spheres is exceedingly clever.  I 
immediately proceeded to implement it and discovered that the heat 
flow in the limit of very small radii for both spheres and cylinders 
is zero!  Oh well.
Current Summary of Heat Flow Calculations for 5m x 5m x 3m Room with 
1m Trymer Insulation:
        Flat Wall Approximation, Uniform Room-Temp K Value:
                347 watts, 128 liters LN2 per day.
        Flat Wall Approximation, K Proportional to sqrt(T):
                297 watts, 110 liters LN2 per day.
        Spherical Room (R1=2.17m), K Proportional to sqrt(T):
                434 watts, 160 liters LN2 per day
             or 500 watts, 180 liters LN2 per day
                if I take inner surface area as 4*pi*R1^2
                instead of 110m^2 of the actual room.
        I am satisfied for the time being that I have the heat flow 
calculations under control.  I think 200 liters per day is a good 
estimate for the LN2 use.  Besides, I have a thesis to write too!
                                        --- Brian Wowk

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