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>Carl wrote:
>
>That brings up an interesting point - can the scrubber pretty much
>absorb ALL the CO2 being exhaled, leaving none to return in the input
>or does *some* fraction return in the breathing loop?  If so, what
>fraction returns, and, is this a function of scrubber lifetime (i.e.
>how far along you are in the usable life of the scrubber) AND, what is
>the function of time to predict CO2 retention in the loop?

I'm not sure about the "fraction" of CO2 scrubbed put the FiCO2 in the inspired
gas is both a function of work rate and time.  I don't have the graphs with me 
so I can't say exactly.  As time goes on and the scrubber is exhausted the 
FiCO2 becomes more sensitive to the work rate.  Hence a scrubber that can
support hard work when first used may not be able to support hard work
when it nears the end of it's life time but may still be able to support
light work rates.

Barrie Kovish
Vancouver, Canada

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