[PSUBS-MAILIST] co2 scrubber

[Sean T. Stevenson via Personal_Submersibles]

Hank, I doubt that humidity is your problem, within the 30 - 70 % limits. You would probably see improved performance with increased temperature, which is probably why the scrubber you breathe into directly works better.

Sean


On February 14, 2017 1:50:26 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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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