Reading the Tea Leaves/Sodasorb Grains

bobby · 28th August 2008, 14:47

Interesting information thanks for posting it. It seems to go against what I have found from experience. I think when I get another Keg with the dye I will pay closer attention and track it a bit. I doubt I will rely on the dye for more than interesting information.

Bobby

Hk101gr · 29th August 2008, 20:37

Quote: (Originally Posted by jkaterenchuk)

You might be right but what evidence can you point me too read that clearly supports your comment that the exhaled gas will always be warmer then the rest of the can?

As I think about it I am not sure that make sense to me as the exhaled gas will be basically at body temperature when it leaves my mouth and then cools from there while it travels thru the loop and enters into the CO2 absorbent. Since the CO2 absorbent reaction is exothermic I suspect that the temperature produced by this reaction is higher than body temperature and hence the gas that left my mouth would be heated as it travels thru the scrubber material and is subjected to area in which the reaction is occuring.

Of course this would not be the first time that my thoughts would be completely wrong.

John

I was thinking that the only metalic part on the loop is the canister. That conducts a lot of heat, probably more than the cl's and the hoses.
So you have warm gas entering the canister and coming in contact with the walls where it cools rapidly, some of that gas before it cools down warms the side of the scrubber right under the exhale hose fitting.
It doesn't matter how exothermic the scrubber reaction is or how warm the gas actually is, just that the side of the canister and scrubber under the exhale hose are slightly warmer the rest of the assembly. That temperature difference could be the cause of the uneven reaction front.

Of course i have no way to prove it, so it's just a theory for now....

Dive safe
Dimitris

28th August 2008, 14:47	#51 (permalink)
bobby RBW Member Current Rebreather/s: Megalodon Dolphin Other Rebreather/s: Inspiration Classic MK 15.X Dolphin Join Date: Jul 2007 Location: Charlotte, NC USA Posts: 92	Re: Reading the Tea Leaves/Sodasorb Grains Interesting information thanks for posting it. It seems to go against what I have found from experience. I think when I get another Keg with the dye I will pay closer attention and track it a bit. I doubt I will rely on the dye for more than interesting information. Bobby __________________ No matter the amount of experience we can all learn and no matter the experience we can all teach. http://www.rebreatherworld.com/photo...s/bobbysig.jpg
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29th August 2008, 20:37	#52 (permalink)
Hk101gr New Member Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Join Date: Dec 2005 Location: Patras,Greece Posts: 99	Re: Reading the Tea Leaves/Sodasorb Grains Quote: (Originally Posted by jkaterenchuk) You might be right but what evidence can you point me too read that clearly supports your comment that the exhaled gas will always be warmer then the rest of the can? As I think about it I am not sure that make sense to me as the exhaled gas will be basically at body temperature when it leaves my mouth and then cools from there while it travels thru the loop and enters into the CO2 absorbent. Since the CO2 absorbent reaction is exothermic I suspect that the temperature produced by this reaction is higher than body temperature and hence the gas that left my mouth would be heated as it travels thru the scrubber material and is subjected to area in which the reaction is occuring. Of course this would not be the first time that my thoughts would be completely wrong. John I was thinking that the only metalic part on the loop is the canister. That conducts a lot of heat, probably more than the cl's and the hoses. So you have warm gas entering the canister and coming in contact with the walls where it cools rapidly, some of that gas before it cools down warms the side of the scrubber right under the exhale hose fitting. It doesn't matter how exothermic the scrubber reaction is or how warm the gas actually is, just that the side of the canister and scrubber under the exhale hose are slightly warmer the rest of the assembly. That temperature difference could be the cause of the uneven reaction front. Of course i have no way to prove it, so it's just a theory for now.... Dive safe Dimitris
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