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Dear All

On the same tack as a cryogenic rebreather, low temperature could be used
to remove the CO2 from the exhaled breath.  As CO2 sublimes at -78 degrees C
one would need some way of maintaining such a low temperature.
This could be done using the 'Peltier' effect - basically the opposite of
a thermocouple - when a voltage/emf/potential is passed accross the junction
of two dissimilar metals a reduction in temperature occurs.  I'm not sure
of the exact minimum temperature that can currently be obtained (we have
some in the lab that can cool to -35 degrees C) however I think that -78
is obtainable.
The only draw back would be current demand, but with research off the back
of electric cars battery technology should move along quickly.

Such a 'Peltier' effect rebreather would do away with the bulky adsorber
cartridge and remove the need to repack the cartridge.

Dual circuits could also be incorporated, increaseing redundancy and duraction
of dive. e.g. the removal of CO2 would no longer be the limiting factor
as it is when using 'Sofnolime' etc.

All we need know is a 12v 8-10 amp/hr battery that is light weight and
rechargeable.

Thanks for reading

Jon

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