[PSUBS-MAILIST] scrubber performance

[Cliff Redus via Personal_Submersibles]

Next test is to compare one vs two occupants to see how the unit behaves
with added CO2 generation.

Cliff

On Sat, May 26, 2018 at 12:23 PM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi All,
> Today I did some extensive scrubber testing.  Gamma has 3 axial scrubbers,
> one is Gamma'a original scrubber from 1971 with a smaller quiet fan.  The
> next one is a home made scrubber made the same as Gamma's original, the
> third is a re-breather scrubber with a computer fan.
> Interestingly after reading through some information Cliff sent me, I
> learned that the flow rate is critical.  The only way I can change that is
> to fill the scrubber canister more or less.  I started with 3\4 full
> canisters and a full re-breather canister and had a CO2 level of 950 PPM.
> With all three canisters full I had a CO2 level of 1133 PPM.  So clearly
> the flow rate makes a big difference.
> Now I understand why Gamma's original scrubber had such a big fan, in
> order for the canister to be full, the fan needs to be quite powerful.
> I also have a true appreciation of how well the altimeter indicates how
> well the O2 level and CO2 level are monitored.
> If the Altimeter was off zero even the tiniest bit, it correlated with the
> instruments perfectly.
> Hank
>
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