[PSUBS-MAILIST] scrubber performance

[Sean T. Stevenson via Personal_Submersibles]

Just to add to Cliff's comment, you will get the most even consumption of scrubber media in a radial scrubber when the flow is from the outer diameter to the inner diameter.  The flow velocity is slower at the greater diameter, so you want to expose the unscrubbed gas there first, so the CO2 concentration across the media lessens as the flow velocity increases at the inner diameter. Fortunately, this embodiment easily accommodates a squirrel cage fan drawing gas from an inner core.

Sean



On August 13, 2016 8:30:51 PM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Your scrubber meets ABS rules which requires the CO2 concentration to
>stay
>below 5000 ppm (1/2%) .  From my own experience, I found that the type
>of
>fan and the flow orientation makes a big difference in how low the
>scrubber
>can pull the CO2 concentration down to.  Specifically, squirrel cage
>blowers work better than axial fans and radial flow works better than
>axial
> flow through the Sodasorb HP.
>
>I am proud of your mom.
>
>Cliff
>
>
>
>On Sat, Aug 13, 2016 at 3:23 PM, hank pronk via Personal_Submersibles <
>personal_submersibles at psubs.org> wrote:
>
>> Hi All,
>> I just did a two person life support test and the CO2 level sits
>around
>> 4,000ppm  and the O2 flow is at .5 lpm   Is that CO2 level high?  
>When I
>> am in the sub alone it sits around 2,500ppm
>> I am getting Gamma all geared up for a big dive with my mother as the
>> passenger, that means a ladder, comfy seat, hot coffee, cookies.  She
>is
>> very excited!
>> Hank
>>
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