Clean Deco

***jradomski*** · 3rd May 2005, 02:27

Quote: (Originally Posted by dteubner)

I have re written the spread sheet so it now uses a nine compartment model and includes a graph. It still makes a lot of assumptions (for a start it doesn't include any stops - just rate of offgassing with a Haldanian model at 1ATA) but it does address Joe's points above.

http://www.davidteubner.com/images/G...calculator.xls

Dave T

4l of gas after 30 minutes @ 100m is probably somewhere in the ballpark.
The pressure differential will effect the offgassing rate and the slow compartments will uptake gas on the stops during the ascent (so actual time is longer than the model you use) , but considering alot of the ofgassing is done shallow where the loop is effected the most does show the need for flushing...

Good work...

I'll toss you some rep points for the effort..

cedricverdier · 3rd May 2005, 16:21

Quote: (Originally Posted by dteubner)

I have re written the spread sheet so it now uses a nine compartment model and includes a graph. It still makes a lot of assumptions (for a start it doesn't include any stops - just rate of offgassing with a Haldanian model at 1ATA) but it does address Joe's points above.

http://www.davidteubner.com/images/G...calculator.xls

Dave T

Thank you Dave,

It's a really nice work. Even if you use a lot of assumptions, it's a really interesting tool (could be a nice visual aid for any CCR Instructor teaching a Mixed-Gas course).

Cheers

3rd May 2005, 02:27	#51 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,004	Quote: (Originally Posted by dteubner) I have re written the spread sheet so it now uses a nine compartment model and includes a graph. It still makes a lot of assumptions (for a start it doesn't include any stops - just rate of offgassing with a Haldanian model at 1ATA) but it does address Joe's points above. http://www.davidteubner.com/images/G...calculator.xls Dave T 4l of gas after 30 minutes @ 100m is probably somewhere in the ballpark. The pressure differential will effect the offgassing rate and the slow compartments will uptake gas on the stops during the ascent (so actual time is longer than the model you use) , but considering alot of the ofgassing is done shallow where the loop is effected the most does show the need for flushing... Good work... I'll toss you some rep points for the effort.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
(Offline)

3rd May 2005, 16:21	#52 (permalink)
cedricverdier S21 M.I.B. Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Sport Kiss Classic Kiss Join Date: Apr 2005 Location: Worldwide! Posts: 497	Quote: (Originally Posted by dteubner) I have re written the spread sheet so it now uses a nine compartment model and includes a graph. It still makes a lot of assumptions (for a start it doesn't include any stops - just rate of offgassing with a Haldanian model at 1ATA) but it does address Joe's points above. http://www.davidteubner.com/images/G...calculator.xls Dave T Thank you Dave, It's a really nice work. Even if you use a lot of assumptions, it's a really interesting tool (could be a nice visual aid for any CCR Instructor teaching a Mixed-Gas course). Cheers __________________ Cedric Verdier PADI Course Director, ANDI-IANTD-PSAI-TDI-DSAT-DAN-NAUI-CMAS Instructor Trainer Trimix (CCR and OC) and Cave Diving Instructor Trainer www.CedricVerdier.com DIRrebreather member
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode