|
Some things to keep in mind concerning internal humidity in a
submersible: 1.
The body (skin) perspires about a
cup (8 oz.) of moisture in an hour (reference: dry suit and aircrew survival equipment
development). 2.
The respirator system probably
gives off 8-12 oz. of moisture in the same time (reference: rebreather development,
tech divers refer to it as ‘goobers”). 3.
If a scrubber is used to remove CO2,
some moisture is required in the sub’s atmosphere to start (and sometimes
maintain) proper scrubber operation 4.
A submersible starts with an
atmosphere that is usually very warm from sun exposure and at near 100%
humidity due to the hatch being located at near sea level. 5.
Most submersible dives are
probably made below the thermal layer so there will be a significant drop in hull
temperature resulting in condensation forming from the initial trapped atmospheric
humidity, perspiration, and exhalation. 6.
Older subs and submersibles used
cork to insulate the hull to minimize condensation on the interior skin, thick neoprene
glued to the internal surfaces is often used today in larger subs. 7.
Some rebreather use the previous
mentioned chemical to collect exhaled moisture so if a scrubber is used in the
submersible, the scrubber canister could be lengthened slightly and a layer of
moisture absorbent included to reduce atmospheric humidity. Hope this helps clarify some of the issues. Jay K. Jeffries Natura nihil fit in frustra - Nature does nothing in vain -----Original Message----- Interesting...my original thought here was to reduce the temperature differential between the surrounding water, and the hull skin. The responses make me wonder about a dual pronged approach of both the thermal insulation, and "snatching" the water vapor out of
the air before it becomes problematic. The sodium polyacrylate lead in concert with an insulator is an intriguing possible solution for further study. Interesting and thought provoking responses...thank you. Joe >From: "George H. Slaterpryce III"
<gslaterp@hotmail.com> >Reply-To: >To: < >Subject: Re: [PSUBS-MAILIST] Insulation >Date: Tue, 5 Sep 2006 18:39:57 -0400 > >Found the name: sodium polyacrylate > >I'm at a loss to find the pre-fab filter builder for them, but I'll
keep >looking. > > > >George H. Slaterpryce III >www.captovis.com >----- Original Message ----- >From: <MerlinSub@t-online.de> >To: < >Sent: Tuesday, September 05, 2006 6:18 PM >Subject: Re: [PSUBS-MAILIST] Insulation > > > > Can anybody find out which material that is? I just fight
against the > > moisture in Sgt.Peppers after a short time of breathing. > > > > Regards Carsten > > > > "George Slaterpryce" <gslaterp@hotmail.com>
schrieb: > >> I forget the exact name of it, but you can use the same
stuff they use >in > >> babies diapers. absorbs like 8 times it's own dry mass of
water. They >make > >> humidity filters with it too. maintenance would be
changing out the >filter. > >> Would keep the air really dry though a de-humidifier writ
large. > >> > >> George H. Slaterpryce III > >> www.captovis.com > > > > > > > > > > > > ************************************************************************ > >
************************************************************************ > >
************************************************************************ > > The personal submersibles mailing list complies with the US
Federal > > CAN-SPAM Act of 2003. Your email address appears in our
database > > because either you, or someone you know, requested you
receive messages > > from our organization. > > > > If you want to be removed from this mailing list simply click
on the > > link below or send a blank email message to: > > removeme- > > > > Removal of your email address from this mailing list occurs
by an > > automated process and should be complete within five minutes
of > > our server receiving your request. > > > > PSUBS.ORG > > > > > > 603-529-1100 > >
************************************************************************ > > ************************************************************************ > >
************************************************************************ > > > > ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme- Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************ |