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At 1:39 PM 6/12/95, Roger Carlson wrote: >If you were to dive in really cold water, insulating the cannister might be a >good idea... maybe by surrounding it with the breathing bag to keep your >breathing gas warm for you. This is exactly what I was thinking. I do most of my diving in 45-55 degree (F) water, and am a little concerned about keeping my breathing gas warm. I'm also worried that canisters designed for warm water might not work as well in the colder waters I dive. >I'm not sure if there is a roll-off in performance >at the high temp end. I'd doubt it. chemical reactions don't usually work that >way, and the absorbent can't break down any more CO2 than you generate, so >your >own metabolic rate is probably the limiter on the fast end of the reaction. I >don't know of any rebreathers offhand that insulate the cannister or use it to >heat your gas, but it seems like a good idea to me. Yes, I'm also concerned about a canister 'meltdown'. It seems like it'd be pretty simple to insulate the canister, or to build an electro-mechanical system that monitors the temp and keeps it in the optimum range by flushing water (or gas) over it at a controlled rate. If heat buildup could cause the canister to fail, the second approach wouldn't be safe. I can imagine that breathing real hot gas might not be to pleasant either :). The first approach would still work fine assuming you matched the heat transfer rate and surface area of the canister to a particular water temperature (and maybe breathing bag?). You might end up owning several different canisters for different conditions. I think I'll see if I can get the sofnolime thermal performance numbers from Molecular, unless someone here can quote them? Thanks, Scott.
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