Re: [PSUBS-MAILIST] idea

[Jon Wallace <jonw@psubs.org>]

Cooling issues are limited to surface operations and shallow diving in 
warm water.  The hull in contact with water is going to act as a heat 
sink and reach equilibrium with the water temp.  This should happen 
rather quickly, in a matter of minutes.  At a slower rate, the interior 
cabin is also going to reach equilibrium with the water temp by 
conduction through the hull.  The Guppy interior was hot due to 
extensive time in shallow warm water (85F), transfer of warm air (90F) 
into the sub as passengers moved in and out, body heat and respiration 
from three occupants, and dive depths of 15 feet or less which was not 
much cooler (if at all) than the surface water temperature.  Add 
humidity from the respiration of those three people and we can start 
talking about heat index.

The ice idea is nice and simple, especially for small subs like the 
K250.  I like the radiator cooling idea that Alan pointed us to for 
larger subs like Jim's GUPPY that have room for it since it can 
circulate the cool water after the ice has melted and should require 
less replenishment of ice, although at some point the ice water itself 
is going to warm up enough not to produce effective cooling.

When Jim operates the GUPPY in the cold Wisconsin waters he won't have 
an issue with a hot cabin.

Jon



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