Re: [PSUBS-MAILIST] my optronic mast idea with sketch

[Paul Lassen <lassen@rosebud.ca>]

I was just wondering about this problem of condensation myself after noticing a picture on Emile's KSS / Garabaldi wreck photo album of the camera man wiping the inside of the main viewport with a towel to (presumably) get rid of the condensation. I've done some poking around and found that a good figure for calculating water output of the occupants is about 50 ml / hr per person, higher if the occupants are "stressed". That's about 1.7 US fluid ounces / hr. per person for our non-metric friends. I also found a solid-state dehumidifier product that might be suitable to modify and perhaps put in line with a CO2 scrubber. It draws 72 watts and can run on 12 volt power. It will pull out 20 oz. of water a day from air that is 86º F and 80% RH. I don't have any idea how that translates to performance in the temperatures and RH conditions common in a Psub. Does anyone out there know how to calculate that? The product is the EDV 2200 which can be seen at 

http://www.eva-dry.com/images/products_2200.jpg

The MSRP is $119.95 US but it seems to retail on other sites for around $70.00.

I suppose that a canister of silica gel in line with the scrubber is probably better from a power consumption point of view.

Paul







On Feb 7, 2010, at 8:31 PM, Jon Wallace wrote:

> 
> That's cool.  Second hand systems seem to be easily obtainable.
> 
> For your condensation experiment, don't forget that cold air can't hold nearly as much moisture as warm air.  To duplicate diving conditions in a water vapor rich environment, you'll want to have the CRT in a container filled with warm air (30+ C) with very high humidity (90% or so), surrounded by a very cool (7-10C) outer environment like a cold water tank.  The worst environment is one in which the difference between current temp and dew point is very small.
> 
> 
> 
> Jens Laland wrote:
>> Jon
>> 
>> I did not mean to indicate the use of a proprietary security system, but
>> rather using second-hand (or NOS) surveillance type of video cameras,
>> often obtainable through eBay, or otherwise.
>> 
>> Besides, I recently purchased 3 identical, brand new battery powered
>> monochrome 5" CRT monitors from a local close-out sale, paying $8 pro
>> item. So I stowed away two of them to serve as spare parts, whilst the
>> last one was totally stripped down, and now to be put into a new custom
>> built, sturdy aluminum housing, complete with better quality on vital
>> components such as potentiometers etc.
>> 
>> This special monitor is then planned to undergo operational tests within a
>> cold, but damp environment to see if its possible to avoid internal
>> condensation at all.
>> 
>> Personally I am not that concerned with some extra 2-300 mA, as my
>> intended use of an optronic mast is solely to improve my own line of
>> vision while cruising with a trimmed diesel at surface (for which I would
>> probably also need an air induction mast).
>> 
>>  
> 
> 
> 
> 
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