Re: Air Use Calculations

[Chris Nugent <dirkpitt77@yahoo.com>]

     Yeah,  I think I probably WILL end up using a
scrubber anyways.  Need to get that damn SCUBA cert. 
I guess.  My sub is turning into more of a monster
with every min. I spend on it (not that that's a BAD
thing!).  Advice well taken.

                           Thanks guys,

                                     Chris

--- Scott L <diver@chilli.net.au> wrote:
> Chris, do you mean you are not going to have
> anything to add Oxygen and
> scrub CO2? I dont think it would have much time
> underwater ;)
> You need to calculate the volume of gas in the sub
> and then work out its
> fraction of oxygen then using a consumption rate of
> between .5 and 3 litres
> a min calculate how long that much oxygen will last.
> Oh, you also need to
> figure how much co2 will be produced and  how long
> before it puts you to
> sleep ;)
> 
> Scott
> 
> ----------
> > From: Chris Nugent <dirkpitt77@yahoo.com>
> > To: personal_submersibles@psubs.org
> > Subject: Air Use Calculations
> > Date: Saturday, October 30, 1999 10:10 AM
> > 
> >      Hey all,
> > 
> >      There having been a lot of discussion about
> > rebreathers and other various environmental
> systems
> > lately, I came up with a question.
> >      The design of my sub being as economical and
> > simple as possible, I have only allowed for a
> > submerged endurance of say one or two hours. 
> Mostly
> > the idea is to avoid building a scrubber and just
> use
> > cabin air.  As long as I have a good monitoring
> system
> > in place, I plan to come up every hour or so and
> just
> > ventilate the cabin w/fresh air.  Opinions on
> this?
> >      So my question is, does anyone know where to
> find
> > how to calculate volume of breathable air used by
> the
> > human body per minute?  Can one extrapolate an
> > estimate of submerged endurance  based on the
> volume
> > of air in the cabin versus volume of air used by
> the
> > human body?  Let me know what you guys think.
> > 
> >                                   Thanks,
> >     
> >                                     Chris
> > 
> >  P.S.  Thanks to all who sounded off on the "Tour
> of
> > The Boat"  thing....nice to meet ya
> > 
> > 
> > =====
> > "Noisy outside, empty inside." - Confucius
> > __________________________________________________
> > Do You Yahoo!?
> > Bid and sell for free at http://auctions.yahoo.com
> 


=====
"Noisy outside, empty inside." - Confucius
__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com