RE: [PSUBS-MAILIST] internal airflow

["Sean T. Stevenson" <ststev@uniserve.com>]

Warmer air will rise, but exhaled breath (with increased CO2 content) might be heavier than the ambient air.  I also have put a dehumidifier upstream of the scrubber to extend the life of the 
consumable, and as such the air coming out of the scrubber is dryer (and possibly lighter) than your exhaled breath or the cabin air.  Which is the more significant factor?  And what about horizontal 
movement?  If my head is forward, do I want the inlet forward and the intake aft to effectively flush the cabin?

-Sean


On Fri, 18 May 2001 14:27:30 -0400, Alec Smyth wrote:

>Would it not be the other way around? Exhaled air being warmer would rise,
>so you would want the scrubber intake high. Just speculation on my part, I
>haven't got to this point yet.
>
>- Alec
>
>-----Original Message-----
>From: Sean T. Stevenson [mailto:ststev@uniserve.com]
>Sent: Friday, May 18, 2001 1:13 PM
>To: personal_submersibles@psubs.org
>Subject: [PSUBS-MAILIST] internal airflow
>
>
>For those of you with 1 atm scrubbed systems, what if any work did you do to
>ensure that the flow of air through the cabin maximizes the recirculatory
>efficiency?  I'm working on a conceptual design, 
>and am thinking of placing the freshly scrubbed air outlets high and the
>intake to scrubber low, but I have no idea how to model the airflow.  Do I
>even need to worry about this?  Maybe diffusion is fast 
>enough to take care of the problem.  Thoughts?
>
>-Sean
>
>