[PSUBS-MAILIST] Calculating Scrubber Residence/Contact Time

[Rick Patton via Personal_Submersibles]

Thanks for the input Alan.  Looking forward to Rivers input.
Rick


On Thu, Nov 23, 2017 at 10:15 AM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick,
> I would be cautious about positioning the CO2 sensor there as moisture is
> a bi-product of the CO2/absorbent reaction, & there would probably be a
> higher humidity reading near the exhaust. I assume this would not be good
> for
> the sensor & may effect readings. I am not sure if this moisture is
> significant
> enough to worry about but mentioning it in case!
> River is a bit of an expert with CO2 sensors, if he is listening in he may
> like
> to comment.
> Cheers Alan
>
> Sent from my iPad
>
> On 24/11/2017, at 8:37 AM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> I was thinking when i get to that point, of mounting my CO2 meter at the
> exhaust port of the scrubber and using it to dial in the best flow rate.
> Rick
>
> On Thu, Nov 23, 2017 at 9:27 AM hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Steve,
>> I read somewhere that the scrubber needs to be two times as tall as it is
>> wide.  I have followed that rule ever since.  Then the theory about as long
>> a soak time as possible comes into play.  My feeling is that that is only
>> important with a closed system like a re-breather.  I base that on Gamma's
>> original scrubber witch was about 10 inches in dia and 6 inches tall with
>> an open top and a hurricane force fan drawing air through it.  It makes
>> sense to me that it does not matter how long the soak time is in a
>> submarine environment as long as you have air flow over the media.  I would
>> do what you have to to make it fit, then play with flow rates.  The key to
>> a good scrubber seems to be to use good media, like Soda Sorb HP
>> Hank
>>
>> On Thursday, November 23, 2017, 8:06:42 AM MST, Steve McQueen via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> All, I am considering reducing the dimensions (length) of my scrubber  to
>> fit into a vertical mounting arrangement in my K-250.  I believe I have a
>> pretty good handle on sorting out the impact to the performance with the
>> exception of residence/contact time.
>>
>>
>>
>> I know the Reynolds factor for my media, chamber length, diameter and the
>> flow rate from the fan.
>>
>>
>>
>> Anyone have a general formula?
>>
>>
>>
>> Steve
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