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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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