[PSUBS-MAILIST] Motor Pod Ventilation

[JimToddPsub at aol.com]

Joe,
Since the water doesn't have to be re-cooled as it does in a  closed-loop 
system, I think the ambient water should be quite  adequate.  The heat 
transfer rate of water is much higher than air and you  have an essentially 
limitless supply.
Jim
 
 
In a message dated 4/13/2014 8:33:43 P.M. Central Daylight Time,  
josephperkel at yahoo.com writes:

Sean,


Northern climates have nice cool seas,  but I'm dealing with  tropical 
temps here averaging in the 80's in summer. With hot seas, which  scheme would 
be best? I simply am not certain, my gut says relying on the  ambient water 
may not do the job. I could be wrong.


Joe

Sent from my iPhone

On Apr 13, 2014, at 9:16 PM, "Sean T. Stevenson" <_cast55 at telus.net_ 
(mailto:cast55 at telus.net) > wrote:




Airflow in constrained spaces is often difficult to model.  Alternatives 
include water cooled motors, or simply effectively heat sinking  the motor 
housings to the hull and using passive water cooling to the  ambient seawater. 
Ultimately, that's where the heat is going anyway. Unless  you can use it 
for some purpose (cabin heat, humidity control etc.) you  might as well sink 
it as directly as possible. 
Sean


On April 13, 2014 6:45:39 PM MDT, Joe Perkel <_josephperkel at yahoo.com_ 
(mailto:josephperkel at yahoo.com) > 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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Sent from Kaiten Mail. Please excuse my brevity.


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