[PSUBS-MAILIST] Air conditioning

[JimToddPsub at aol.com]

Joe,
 
There have been several prior threads over the past few  years regarding 
non-compressor, onboard A-C systems such as modified ice  chests with computer 
fans.  The cooling medium doesn't have to be  ice.  It could even be steel 
bricks that have been cooled in a freezer or  in a container of dry ice if 
you're prepared to safely handle steel that's been  cooled to less that -109 
F.  Obviously the dry ice doesn't go into the  sub.  You'll still get 
humidity reduction from the condensation on the  cooling medium.
 
Triton, U-Boat Worx, and some others have onboard A-C systems that might  
be  compressor based.  Maybe those who toured Triton can answer  that.  I'd 
certainly like to see the specs on weight, capacity, battery  draw, etc.  
 
I don't plan on a mechanical system myself, but will depend on surface  
cooling from a system on the tender.  That's very similar to what Nuytco  uses. 
 I'll use a small passive system onboard when necessary.  
 
Jim. 
 
 
In a message dated 4/13/2014 9:16:59 P.M. Central Daylight Time,  
josephperkel at yahoo.com writes:

 

Jon /Sean /  Jim,

If I can simplify  the motor cooling with ambient water, all the better, I 
prefer the simplicity  of that method. But, I must, must, have 
air-conditioning! I must reduce cabin  humidity and temperature to comfortable levels, thi
s is a manned steel drum in  the tropical sun! Plus, I want my electronics 
dry.

My intent is to  isolate the machine space with a thermal bulkhead with the 
required lines and  piping routed through as appropriate. That machine 
space then force ventilated  to the outside in the sail for extended surface 
transits. I was figuring that  since I’m doing all this ventilating anyway that 
I would feed these outside  motor pods into this environment. But I do like 
the idea of keeping down the  number of thru hulls if I don’t need them and 
just use the passing  water.

That bulkhead need  not be neither structural nor watertight, simply a 
thermal barrier with  manhole access to the goodies beyond. The space can be 
monitored with sensors  and video and a fire suppression system could be 
discharged without impacting  the occupants???

 

Joe

 
 
 
On Sunday, April 13, 2014 10:11 PM, Jon  Wallace <jonw at psubs.org> wrote:


 
 

A good part of the year  in your climate the outside air is likely to be 
hotter than the sea.  I'm  not convinced there's a clear benefit outweighing 
the sea as a heat sink.


On 4/13/2014 8:45 PM, Joe Perkel  wrote:



 

I am considering  a scheme for dealing with electric motor cooling and 
would like input on the  viability of the idea and any pros or cons that I may 
be  missing.

In looking at my  SeeHund replica, note that the torpedo/pod(s) length 
exceed needed battery  capacity.  So the idea being that the aft ends of both  
will house electric motors that are isolated from the battery  compartments.

I’m thinking to  ventilate these aft motor units into the aft machinery 
space within the main  hull. Incidentally, the hull diameter will be 42” and 
the torpedoes #14  pipe. This will leave a significant airspace around these 
motor units  allowing me to use fan cooled motor cases.  Each motor pod  
could be connected with vent pipes for intake and output airflow, then the  
machinery space itself force vented to the outside with  main induction and 
exhaust vents.  All  this for continuous surface running of course. Submerged, 
the motor units  would be intermittent duty.

The centerline  unit would be fully enclosed and not vented, therefore not 
as attractive for  continuous duty due to thermal constraints.

 

Joe






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