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Re: [PSUBS-MAILIST] Condensation in a psub



Hi Frank,
I look after my elderly Mother.
She has these disposable nappies. I just checked one & they can hold
2&1/2 liters of water. You could cut two holes in them & put them over your head.
This would trap any exhaled moisture.( What award category does this invention come under?)
I was thinking of cutting out round sections of these & placing them in line with my CO2 scrubber.
There would need to be at least an inch gap between them & the exhaust of the scrubber as they
turn to a jelly & wouldn't let the air through. I get them free & they are probably cutting technology
for absorbing moisture.
Alan
 
----- Original Message -----
Sent: Monday, February 08, 2010 5:57 AM
Subject: Re: [PSUBS-MAILIST] Condensation in a psub

In a message dated 2/7/2010 7:12:22 A.M. Pacific Standard Time, jonw@psubs.org writes:
Condensation is an issue as well but hopefully we can find solutions to
counter it.
This brings up a point that has sparked my interest on several occasions.
We've heard mention of condensation on windows, bilge areas, and general corrosion issues inside our subs.
Good paint, diligent maintenance, and the use of stainless and epoxy potting where possible are methods to help keep the damage to a minimum. I have tried to keep my various fabrications and overall design geared toward maintainability as much as possible, knowing that I'll need to grind out and re-paint on a regular basis. No computers on-board but some electronics are necessary. ( my Margarita blender has a hand crank )
Preventing and managing condensation could be a large part of a good maintenance program.
The air circulatory system in our little boats seems like the logical place to attack the problem of excess condensation.
With or without a CO2 scrubber system, it could be beneficial to have a water scrubber in a psub.
I wonder how a canister of desiccant could be incorporated into the duct system, or how effective it would be at removing moisture from the cabin air.
Some of our northern members like Dean have expressed interest in a heater for the sub. Others have mentioned the increased moisture when operating in tropical waters.
Can a canister of desiccant be dried out and re-used ?
How much electrical energy would be used to drive such a system ?
How much air volume would need to be processed per person ? 
Can a "water trap" be made with a reservoir that can be dumped after each dive ?
How much water actually collects in a sub ?
Does a bilge need a pump or would a sponge be enough to evacuate the water ?
Anybody got any ideas on this ?
Frank D.