[PSUBS-MAILIST] Calculating Scrubber Residence/Contact Time

[Alan via Personal_Submersibles]

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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