[PSUBS-MAILIST] scrubber performance

[hank pronk via Personal_Submersibles]

Sean,I can not remember the temperature over the length of a typical dive.  I would estimate 10C after 1\2 hr at 100 feet.   When I dive Kootenay  lake it is probably 5C I wonder how DW's manage, they dive all over the world and I am sure in the winter.Hank
 

    On Wednesday, February 15, 2017 5:34 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 I don't think it will generate as much heat as you think. Yes, the reaction is exothermic, which helps make the scrubber efficient, but once the scrubbed air returns to the cabin, that heat is lost to the surroundings very quickly. Certainly, I wouldn't expect it to approach the same magnitude as the metabolic heat produced by the occupant(s), plus whatever your electronics are putting out. Have you measured your cabin temperature over the course of a dive in cold water?Sean


On February 15, 2017 1:34:39 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
I was going to ask you guys that very question, is it worth trying to keep the sub warm.    My understanding is that the absorbent actually generates heat.  Maybe once it is going it is fine by generating its own heat.   Hank 

    On Wednesday, February 15, 2017 11:37 AM, ! hankpronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Sean,You were correct, I pre heated the sub to 20C and the performance improved, after 10 minutes or so the scrubber performance really improved.  When I travel to my dive site, I will turn on the scrubber while the sub is hot inside and it can get warmed up before I dive.  I put a PWM controller on the fan but it performs best at full speed.The new Radial scrubber alone keeps up just fine (1700 PPM ) with the sensor at the front of the sub and the circulation fan! runningabout 1\4 throttle.I will likely need both scrubbers going with a passenger.Hank
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