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> MIke, remember you are under pressure - not at one ATA. And , as I said, > I am not sure if it makes any diffrence, and for my purpoases I assume > it does not make enough of a difference. I can say that I would always > like to get rid of CO2, but then we are not making a whole lot at deco > anyway. I can offer some anecdotal evidence for the volume of inert gas offgassed during deco. After a dive to 160 feet for 40 minutes with a CCR, 10/50 as a diluent, and a PO2 of 1.0, I will stop at 20 feet and flush out the counterlung with fresh O2 which gives me a P02 in the loop of something like 1.55. After sitting there for 10 minutes or so I see the PO2 drop to 1.5. So there is now an additional 3% fraction of inert gas in the loop. I think that would work out to something like a quarter liter of inert gas. If you take that PO2 drop of .05 over 10 minutes (that's about 20 breaths for me on OC) then you would get an accumulated inert gas pressure of .0025 ata at the end of each breath. I don't think that that will make much of a difference. That's also more of an upper bound since some of the PO2 drop may be due to other things, like the partial pressure of the moisture in the loop. As for working it out with ZH L-16, I'm not sure how to go about that without assigning volumes or masses to the various tissue "compartments". -bruce > Mike Rodriguez wrote: > > > > At 06:50 PM 1/11/00 -0500, kirvine@sa*.ne* wrote: > > > > >"breathing rate" is basicly insignificant, but you could get effects if > > >you breathed too little relative to normal breahting. The problem is > > >that you get relaxed and do not produce much CO2, and obviously have > > >very hig O2, so your reflex drops away. This could make for less gas > > >exchange, maybe. > > > > Hmmm... I don't think this effect is significant. I assume you mean > > that if the breath in your lungs takes on enough inert gas to reduce > > the gas tension significantly, it would reduce the rate of off-gassing; > > but if this were the case, decomression would occure far more quickly > > than it does. Each lungfull takes away only a tiny portion of the > > accumulated inert gas which is one of the reasons it takes a while > > to decompress. > > > > The ZH-L16 equations and constants could be used to calculate the > > actual mass of inert gas taken on during a dive and then used to > > calculate the mass off-gassed during deco. Knowing this, the total > > deco time, and the average diver's breathing rate we can determine > > the percent saturation with inert gas of each breath and extrapolate > > the number to a non-average diver breathing only once per minute. > > I'll see if I can come up with some numbers and post what I find. > > > > -Mike Rodriguez > > <mikey@ma*.co*> > > Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n > > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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