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Even in the tropics, the water temp at 100 feet deep is enough to cool the
sub. It's at or near the surface where the heat build-up is bad.
For Dean, Jim, and all the northern psub guys, heating is more of an issue
than cooling. I seem to remember a thread on this some time back. I think a
chemical mixture in a sealed box creating a heat source was mentioned as a
possible method of heating air without using electrical resistance heaters
that obviously would suck up a lot of battery power.
The box would need to be robust and completely sealed to prevent gasses
escaping. Should be fairly easy to fabricate a canister type system so the
heat or cold source could be switched out easily.
Frank D.
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