[PSUBS-MAILIST] co2 scrubber

[hank pronk via Personal_Submersibles]

I just completed more scrubber testing.  With both scrubbers running and me breathing into the re-breather scrubber, I bottomed out a 508 ppm.  If I turn off the radial scrubber it starts to climb immediately.  If I stop breathing into the re-breather scrubber, the level rises immediately.  The re-breather has a fan running also.  The humidity level in Gamma is 66% and the temp is 15C .  My conclusion is that I need to increase the humidity level.  The humidity level in Gamma rose from 48% to 66% during the test.  Also at this temperature, Like Emile said, the radial scrubber needs to warm up of at least 15 minutes.  The re-breather scrubber with me breathing into it starts to work almost immediately.  I also think my fan is to fast on my radial scrubber at 24 V, I can run it on 12V and see what happens.  The radial filter did not slow the airflow as I expected.The speed control on the cooling\ circulation   fan is an absolute dream.Hank 

    On Tuesday, February 14, 2017 8:31 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Just another comment regarding the cabin air - the temperature needs to be maintained within limits of 14°C to 30°C (57.2°F - 86°F).  Water vapour production is 1.81 kg (4 lb) per person per day.Sean


On February 13, 2017 2:14:08 PM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Thanks for the suggestions.
I think I'll take Sean's advice & keep my humidity control device separate
from the scrubber intake.
   Using another fan & directing air through a desiccant filter may be the way
to go. Plenty of humidity in Auckland to experiment with, it's 92% at the moment.
Alan

Sent from my iPad


 On 14/02/2017, at 5:36 AM, River Dolfi via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 
 I don't see what the aversion to using desiccant is. Silica gel desiccant are rechargeable, so wouldn't be expensive at all to utilize. After they are loaded with water and the indicator changes color, you simply bake it in an oven and it's good as new.
 
 

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