[PSUBS-MAILIST] Air conditioning

[Alan James]

Jim,
I didn't see the AC unit but was told it used up a lot of power.
I know my ambient had me cooking while travelling on the surface under
the summer sun, but cooled instantaneously when diving.
   I am considering having two snorkel valves with a fan on one of them & it's
hose pointed at me, for surface transit. The snorkels will be good for 
holding on to for entry. Any comment on this idea is appreciated.
I mentioned during the G.L. summary that air conditioning
is a requirement, but noted that some boats like the Curasub have an exemption
for some reason.
Alan


________________________________
 From: "JimToddPsub at aol.com" <JimToddPsub at aol.com>
To: personal_submersibles at psubs.org 
Sent: Monday, April 14, 2014 3:51 PM
Subject: [PSUBS-MAILIST] Air conditioning
 


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, 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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