[PSUBS-MAILIST] Motor Pod Ventilation

[Joe Perkel]

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, this 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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