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Debby,
R-134a is not an ozone depleting chemical. It came into use to
replace R-12 refrigerant which was an ODC. One negative to R-134a is its
global warming potential value of 1300 - 1400. Viable replacements for
R-134a include R-143a (0 ODC and 1000 GWP) and R-152a (0 ODC and 140 GWP).
While I don't have data for R-134a or R-143a, R-152a is flammable (nothing in
life is perfect).
Some people have switched from these liquid chemicals to compressed air but
applications are limited. The air supply needs to be very clean and dry or
you'll contaminate the parts. And with electronics there is the danger of
static buildup when using air. There are refillable spray cans available
that can be used but they will require frequent refilling.
As for recycling refrigerant, it's a matter of practicality. The
compressor is a closed system so it is relatively easy to capture and remove the
refrigerant during service. There is also the issue of cost. R-134a
is about 5 times more expensive than the R-12 it replaced. While it would
be great if you could capture the R-134a sprayed from these aerosol cans, it's
just not practical.
Perhaps others on P2tech will be able to offer some additional/more current
info since I've been away from this field for a few years. Hope this
helps.
Mike Callahan
Jacobs Engineering
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