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"Who knew it could be so easy". Somebody send this guy a shovel. John R. Rose wrote: > > Stuart, > > I've been trying to come with a final project for my CS2 students for > over a week now. I think that your idea of developing software for use > with a closed-circuit rebreather is a great project idea. > Since they have already had two semesters of calculus, the math will > be pretty straight forward for them. Although your experience as a poor > O/C diver gives you a leg up over most of my students, it sounds like they > know as much about CC as you do. So if you can do it they should be able > to do it as well. > > Let me write up the project description along with the relevant update > equations for changing gas concentrations and I'll send you a copy. > I have about 85 kids in this class, so if you would like us to evalute > your program as well just send us a copy. Since I have 3 TAs for this > course, it would be no problem for us to grade it along with the rest. > (Directions on program submission are part of the project writup.) > > Let me know if you are interested and thanks for the project idea. > > -John > > P.S. that is an interesting account name that you have: > "divebimbo@li*.fr*.co*.uk*" > > I'm developing some software for use with closed-circuit rebreathers and I > > was hoping someone out there could double check my mathematics. > > > > The problem is: > > > > CCR's use a constant partial pressure. With a nitrox or heliox rebreather > > it is fairly easy to work out what gas a diver will actually be breathing. > > But if a diver is using trimix as a diluent gas, what is the actual gas mix > > he/she is breathing at a given depth. > > > > For example, a diver plans a 90m (295ft) dive using a diluent gas of TX > > 13/45 and constant ppO2 of 1.3bar. Now if this diver ascends to 70m (230ft) > > the rebreather will add oxygen to the diluent in the loop to give a ppO2 of > > 1.3bar. Obviously, the actual gas mix being breathed has (approximately) > > 16% oxygen in it. But what is the new helium content? > > > > What I really need to know is the actual formula; my software uses one > > method, but being a poor OC diver, I don't have a great deal of experience > > in CC equipment, so I'm not sure if it is correct. I'd appreciate any > > answers. > > > > Regards, > > > > Stuart. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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